diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.qpf b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.qpf new file mode 100644 index 00000000..7676d539 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.qpf @@ -0,0 +1,31 @@ +# -------------------------------------------------------------------------- # +# +# Copyright (C) 1991-2014 Altera Corporation +# Your use of Altera Corporation's design tools, logic functions +# and other software and tools, and its AMPP partner logic +# functions, and any output files from any of the foregoing +# (including device programming or simulation files), and any +# associated documentation or information are expressly subject +# to the terms and conditions of the Altera Program License +# Subscription Agreement, Altera MegaCore Function License +# Agreement, or other applicable license agreement, including, +# without limitation, that your use is for the sole purpose of +# programming logic devices manufactured by Altera and sold by +# Altera or its authorized distributors. Please refer to the +# applicable agreement for further details. +# +# -------------------------------------------------------------------------- # +# +# Quartus II 64-Bit +# Version 13.1.4 Build 182 03/12/2014 SJ Web Edition +# Date created = 19:06:48 June 09, 2019 +# +# -------------------------------------------------------------------------- # + +QUARTUS_VERSION = "13.1" +DATE = "19:06:48 June 09, 2019" + +# Revisions + +PROJECT_REVISION = "Mayday" + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.qsf b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.qsf new file mode 100644 index 00000000..a4bb174b --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.qsf @@ -0,0 +1,203 @@ +# -------------------------------------------------------------------------- # +# +# Copyright (C) 1991-2014 Altera Corporation +# Your use of Altera Corporation's design tools, logic functions +# and other software and tools, and its AMPP partner logic +# functions, and any output files from any of the foregoing +# (including device programming or simulation files), and any +# associated documentation or information are expressly subject +# to the terms and conditions of the Altera Program License +# Subscription Agreement, Altera MegaCore Function License +# Agreement, or other applicable license agreement, including, +# without limitation, that your use is for the sole purpose of +# programming logic devices manufactured by Altera and sold by +# Altera or its authorized distributors. Please refer to the +# applicable agreement for further details. +# +# -------------------------------------------------------------------------- # +# +# Quartus II 64-Bit +# Version 13.1.4 Build 182 03/12/2014 SJ Web Edition +# Date created = 18:04:04 June 09, 2019 +# +# -------------------------------------------------------------------------- # +# +# Notes: +# +# 1) The default values for assignments are stored in the file: +# Defender_MiST_assignment_defaults.qdf +# If this file doesn't exist, see file: +# assignment_defaults.qdf +# +# 2) Altera recommends that you do not modify this file. This +# file is updated automatically by the Quartus II software +# and any changes you make may be lost or overwritten. +# +# -------------------------------------------------------------------------- # + + + +# Project-Wide Assignments +# ======================== +set_global_assignment -name PROJECT_CREATION_TIME_DATE "21:22:13 JUNE 04, 2019" +set_global_assignment -name PROJECT_OUTPUT_DIRECTORY output_files +set_global_assignment -name PRE_FLOW_SCRIPT_FILE "quartus_sh:rtl/build_id.tcl" +set_global_assignment -name ORIGINAL_QUARTUS_VERSION 13.1 +set_global_assignment -name LAST_QUARTUS_VERSION 13.1 +set_global_assignment -name SMART_RECOMPILE ON +set_global_assignment -name SYSTEMVERILOG_FILE rtl/Mayday_MiST.sv +set_global_assignment -name VHDL_FILE rtl/defender.vhd +set_global_assignment -name VHDL_FILE rtl/defender_sound_board.vhd +set_global_assignment -name VHDL_FILE rtl/defender_sound.vhd +set_global_assignment -name VHDL_FILE rtl/defender_decoder_3.vhd +set_global_assignment -name VHDL_FILE rtl/defender_decoder_2.vhd +set_global_assignment -name VHDL_FILE rtl/defender_cmos_ram.vhd +set_global_assignment -name SYSTEMVERILOG_FILE rtl/YM2149.sv +set_global_assignment -name VHDL_FILE rtl/pia6821.vhd +set_global_assignment -name VHDL_FILE rtl/cpu68.vhd +set_global_assignment -name VHDL_FILE rtl/cpu09l_128.vhd +set_global_assignment -name QIP_FILE rtl/pll_mist.qip +set_global_assignment -name VERILOG_FILE rtl/data_io.v +set_global_assignment -name SYSTEMVERILOG_FILE rtl/sdram.sv +set_global_assignment -name VHDL_FILE rtl/gen_ram.vhd +set_global_assignment -name VHDL_FILE rtl/dac.vhd +set_global_assignment -name QIP_FILE ../../../common/mist/mist.qip + +# Pin & Location Assignments +# ========================== +set_location_assignment PIN_7 -to LED +set_location_assignment PIN_54 -to CLOCK_27 +set_location_assignment PIN_144 -to VGA_R[5] +set_location_assignment PIN_143 -to VGA_R[4] +set_location_assignment PIN_142 -to VGA_R[3] +set_location_assignment PIN_141 -to VGA_R[2] +set_location_assignment PIN_137 -to VGA_R[1] +set_location_assignment PIN_135 -to VGA_R[0] +set_location_assignment PIN_133 -to VGA_B[5] +set_location_assignment PIN_132 -to VGA_B[4] +set_location_assignment PIN_125 -to VGA_B[3] +set_location_assignment PIN_121 -to VGA_B[2] +set_location_assignment PIN_120 -to VGA_B[1] +set_location_assignment PIN_115 -to VGA_B[0] +set_location_assignment PIN_114 -to VGA_G[5] +set_location_assignment PIN_113 -to VGA_G[4] +set_location_assignment PIN_112 -to VGA_G[3] +set_location_assignment PIN_111 -to VGA_G[2] +set_location_assignment PIN_110 -to VGA_G[1] +set_location_assignment PIN_106 -to VGA_G[0] +set_location_assignment PIN_136 -to VGA_VS +set_location_assignment PIN_119 -to VGA_HS +set_location_assignment PIN_65 -to AUDIO_L +set_location_assignment PIN_80 -to AUDIO_R +set_location_assignment PIN_105 -to SPI_DO +set_location_assignment PIN_88 -to SPI_DI +set_location_assignment PIN_126 -to SPI_SCK +set_location_assignment PIN_127 -to SPI_SS2 +set_location_assignment PIN_91 -to SPI_SS3 +set_location_assignment PIN_13 -to CONF_DATA0 +set_location_assignment PLL_1 -to "pll:pll|altpll:altpll_component" +set_location_assignment PIN_49 -to SDRAM_A[0] +set_location_assignment PIN_44 -to SDRAM_A[1] +set_location_assignment PIN_42 -to SDRAM_A[2] +set_location_assignment PIN_39 -to SDRAM_A[3] +set_location_assignment PIN_4 -to SDRAM_A[4] +set_location_assignment PIN_6 -to SDRAM_A[5] +set_location_assignment PIN_8 -to SDRAM_A[6] +set_location_assignment PIN_10 -to SDRAM_A[7] +set_location_assignment PIN_11 -to SDRAM_A[8] +set_location_assignment PIN_28 -to SDRAM_A[9] +set_location_assignment PIN_50 -to SDRAM_A[10] +set_location_assignment PIN_30 -to SDRAM_A[11] +set_location_assignment PIN_32 -to SDRAM_A[12] +set_location_assignment PIN_83 -to SDRAM_DQ[0] +set_location_assignment PIN_79 -to SDRAM_DQ[1] +set_location_assignment PIN_77 -to SDRAM_DQ[2] +set_location_assignment PIN_76 -to SDRAM_DQ[3] +set_location_assignment PIN_72 -to SDRAM_DQ[4] +set_location_assignment PIN_71 -to SDRAM_DQ[5] +set_location_assignment PIN_69 -to SDRAM_DQ[6] +set_location_assignment PIN_68 -to SDRAM_DQ[7] +set_location_assignment PIN_86 -to SDRAM_DQ[8] +set_location_assignment PIN_87 -to SDRAM_DQ[9] +set_location_assignment PIN_98 -to SDRAM_DQ[10] +set_location_assignment PIN_99 -to SDRAM_DQ[11] +set_location_assignment PIN_100 -to SDRAM_DQ[12] +set_location_assignment PIN_101 -to SDRAM_DQ[13] +set_location_assignment PIN_103 -to SDRAM_DQ[14] +set_location_assignment PIN_104 -to SDRAM_DQ[15] +set_location_assignment PIN_58 -to SDRAM_BA[0] +set_location_assignment PIN_51 -to SDRAM_BA[1] +set_location_assignment PIN_85 -to SDRAM_DQMH +set_location_assignment PIN_67 -to SDRAM_DQML +set_location_assignment PIN_60 -to SDRAM_nRAS +set_location_assignment PIN_64 -to SDRAM_nCAS +set_location_assignment PIN_66 -to SDRAM_nWE +set_location_assignment PIN_59 -to SDRAM_nCS +set_location_assignment PIN_33 -to SDRAM_CKE +set_location_assignment PIN_43 -to SDRAM_CLK + +# Classic Timing Assignments +# ========================== +set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0 +set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85 +set_global_assignment -name TIMEQUEST_MULTICORNER_ANALYSIS ON +set_global_assignment -name TIMEQUEST_DO_CCPP_REMOVAL ON + +# Analysis & Synthesis Assignments +# ================================ +set_global_assignment -name FAMILY "Cyclone III" +set_global_assignment -name TOP_LEVEL_ENTITY Mayday_MiST +set_global_assignment -name DEVICE_FILTER_PIN_COUNT 144 +set_global_assignment -name DEVICE_FILTER_SPEED_GRADE 8 + +# Fitter Assignments +# ================== +set_global_assignment -name DEVICE EP3C25E144C8 +set_global_assignment -name ENABLE_CONFIGURATION_PINS OFF +set_global_assignment -name ENABLE_NCE_PIN OFF +set_global_assignment -name ENABLE_BOOT_SEL_PIN OFF +set_global_assignment -name CYCLONEIII_CONFIGURATION_SCHEME "PASSIVE SERIAL" +set_global_assignment -name CRC_ERROR_OPEN_DRAIN OFF +set_global_assignment -name FORCE_CONFIGURATION_VCCIO ON +set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL" +set_global_assignment -name RESERVE_DATA1_AFTER_CONFIGURATION "USE AS REGULAR IO" +set_global_assignment -name RESERVE_FLASH_NCE_AFTER_CONFIGURATION "USE AS REGULAR IO" +set_global_assignment -name CYCLONEII_RESERVE_NCEO_AFTER_CONFIGURATION "USE AS REGULAR IO" +set_global_assignment -name RESERVE_DATA0_AFTER_CONFIGURATION "USE AS REGULAR IO" +set_global_assignment -name RESERVE_DCLK_AFTER_CONFIGURATION "USE AS REGULAR IO" + +# Assembler Assignments +# ===================== +set_global_assignment -name USE_CONFIGURATION_DEVICE OFF +set_global_assignment -name GENERATE_RBF_FILE ON + +# Power Estimation Assignments +# ============================ +set_global_assignment -name POWER_PRESET_COOLING_SOLUTION "NO HEAT SINK WITH STILL AIR" +set_global_assignment -name POWER_BOARD_THERMAL_MODEL "NONE (CONSERVATIVE)" + +# Advanced I/O Timing Assignments +# =============================== +set_global_assignment -name OUTPUT_IO_TIMING_NEAR_END_VMEAS "HALF VCCIO" -rise +set_global_assignment -name OUTPUT_IO_TIMING_NEAR_END_VMEAS "HALF VCCIO" -fall +set_global_assignment -name OUTPUT_IO_TIMING_FAR_END_VMEAS "HALF SIGNAL SWING" -rise +set_global_assignment -name OUTPUT_IO_TIMING_FAR_END_VMEAS "HALF SIGNAL SWING" -fall + +# --------------------------- +# start ENTITY(Defender_MiST) + + # start DESIGN_PARTITION(Top) + # --------------------------- + + # Incremental Compilation Assignments + # =================================== + set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top + set_global_assignment -name PARTITION_FITTER_PRESERVATION_LEVEL PLACEMENT_AND_ROUTING -section_id Top + set_global_assignment -name PARTITION_COLOR 16764057 -section_id Top + + # end DESIGN_PARTITION(Top) + # ------------------------- + +# end ENTITY(Defender_MiST) +# ------------------------- +set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top \ No newline at end of file diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.sdc b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.sdc new file mode 100644 index 00000000..fca44902 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Mayday.sdc @@ -0,0 +1,137 @@ +## Generated SDC file "vectrex_MiST.out.sdc" + +## Copyright (C) 1991-2013 Altera Corporation +## Your use of Altera Corporation's design tools, logic functions +## and other software and tools, and its AMPP partner logic +## functions, and any output files from any of the foregoing +## (including device programming or simulation files), and any +## associated documentation or information are expressly subject +## to the terms and conditions of the Altera Program License +## Subscription Agreement, Altera MegaCore Function License +## Agreement, or other applicable license agreement, including, +## without limitation, that your use is for the sole purpose of +## programming logic devices manufactured by Altera and sold by +## Altera or its authorized distributors. Please refer to the +## applicable agreement for further details. + + +## VENDOR "Altera" +## PROGRAM "Quartus II" +## VERSION "Version 13.1.0 Build 162 10/23/2013 SJ Web Edition" + +## DATE "Sun Jun 24 12:53:00 2018" + +## +## DEVICE "EP3C25E144C8" +## + +# Clock constraints + +# Automatically constrain PLL and other generated clocks +derive_pll_clocks -create_base_clocks + +# Automatically calculate clock uncertainty to jitter and other effects. +derive_clock_uncertainty + +# tsu/th constraints + +# tco constraints + +# tpd constraints + +#************************************************************** +# Time Information +#************************************************************** + +set_time_format -unit ns -decimal_places 3 + + + +#************************************************************** +# Create Clock +#************************************************************** + +create_clock -name {SPI_SCK} -period 41.666 -waveform { 20.8 41.666 } [get_ports {SPI_SCK}] + +#************************************************************** +# Create Generated Clock +#************************************************************** + + +#************************************************************** +# Set Clock Latency +#************************************************************** + + + +#************************************************************** +# Set Clock Uncertainty +#************************************************************** + +#************************************************************** +# Set Input Delay +#************************************************************** + +set_input_delay -add_delay -clock_fall -clock [get_clocks {CLOCK_27}] 1.000 [get_ports {CLOCK_27}] +set_input_delay -add_delay -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {CONF_DATA0}] +set_input_delay -add_delay -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_DI}] +set_input_delay -add_delay -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_SCK}] +set_input_delay -add_delay -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_SS2}] +set_input_delay -add_delay -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_SS3}] + +set_input_delay -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -max 6.4 [get_ports SDRAM_DQ[*]] +set_input_delay -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -min 3.2 [get_ports SDRAM_DQ[*]] + +#************************************************************** +# Set Output Delay +#************************************************************** + +set_output_delay -add_delay -clock_fall -clock [get_clocks {SPI_SCK}] 1.000 [get_ports {SPI_DO}] +set_output_delay -add_delay -clock_fall -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[1]}] 1.000 [get_ports {AUDIO_L}] +set_output_delay -add_delay -clock_fall -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[1]}] 1.000 [get_ports {AUDIO_R}] +set_output_delay -add_delay -clock_fall -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] 1.000 [get_ports {LED}] +set_output_delay -add_delay -clock_fall -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] 1.000 [get_ports {VGA_*}] + +set_output_delay -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -max 1.5 [get_ports {SDRAM_D* SDRAM_A* SDRAM_BA* SDRAM_n* SDRAM_CKE}] +set_output_delay -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -min -0.8 [get_ports {SDRAM_D* SDRAM_A* SDRAM_BA* SDRAM_n* SDRAM_CKE}] +set_output_delay -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -max 1.5 [get_ports {SDRAM_CLK}] +set_output_delay -clock [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -min -0.8 [get_ports {SDRAM_CLK}] + +#************************************************************** +# Set Clock Groups +#************************************************************** + +set_clock_groups -asynchronous -group [get_clocks {SPI_SCK}] -group [get_clocks {pll|altpll_component|auto_generated|pll1|clk[*]}] + +#************************************************************** +# Set False Path +#************************************************************** + + + +#************************************************************** +# Set Multicycle Path +#************************************************************** + +set_multicycle_path -to {VGA_*[*]} -setup 2 +set_multicycle_path -to {VGA_*[*]} -hold 1 + +set_multicycle_path -from [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -to [get_clocks {pll|altpll_component|auto_generated|pll1|clk[1]}] -setup 2 +set_multicycle_path -from [get_clocks {pll|altpll_component|auto_generated|pll1|clk[0]}] -to [get_clocks {pll|altpll_component|auto_generated|pll1|clk[1]}] -hold 1 + +#************************************************************** +# Set Maximum Delay +#************************************************************** + + + +#************************************************************** +# Set Minimum Delay +#************************************************************** + + + +#************************************************************** +# Set Input Transition +#************************************************************** + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/ReadMe.txt b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/ReadMe.txt new file mode 100644 index 00000000..622794a7 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/ReadMe.txt @@ -0,0 +1,17 @@ +Williams Mayday + +Port to MiST + +MAYDAY.ROM is required at the root of the SD-Card. + + Fire Forward = Fire or Space + Mayday = Fire2 or ALT + Fire Backward = Fire3 or CTRL + + Change Direction = Left or Right + Up = Up + Down = Down + + Advance = A + Auto up = U + Service = H \ No newline at end of file diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Release/MAYDAY.ROM b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Release/MAYDAY.ROM new file mode 100644 index 00000000..0508ad5a Binary files /dev/null and b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Release/MAYDAY.ROM differ diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Release/Mayday.rbf b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Release/Mayday.rbf new file mode 100644 index 00000000..bd95edb0 Binary files /dev/null and b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/Release/Mayday.rbf differ diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/clean.bat b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/clean.bat new file mode 100644 index 00000000..c9a2cb06 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/clean.bat @@ -0,0 +1,15 @@ +@echo off +del /s *.bak +del /s *.orig +del /s *.rej +rmdir /s /q db +rmdir /s /q incremental_db +rmdir /s /q output +rmdir /s /q simulation +rmdir /s /q greybox_tmp +del PLLJ_PLLSPE_INFO.txt +del *.qws +del *.ppf +del *.qip +del *.ddb +pause diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/Mayday_MiST.sv b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/Mayday_MiST.sv new file mode 100644 index 00000000..85905811 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/Mayday_MiST.sv @@ -0,0 +1,260 @@ +//============================================================================ +// Arcade: Mayday +// + +module Mayday_MiST( + output LED, + output [5:0] VGA_R, + output [5:0] VGA_G, + output [5:0] VGA_B, + output VGA_HS, + output VGA_VS, + output AUDIO_L, + output AUDIO_R, + input SPI_SCK, + output SPI_DO, + input SPI_DI, + input SPI_SS2, + input SPI_SS3, + input CONF_DATA0, + input CLOCK_27, + + output [12:0] SDRAM_A, + inout [15:0] SDRAM_DQ, + output SDRAM_DQML, + output SDRAM_DQMH, + output SDRAM_nWE, + output SDRAM_nCAS, + output SDRAM_nRAS, + output SDRAM_nCS, + output [1:0] SDRAM_BA, + output SDRAM_CLK, + output SDRAM_CKE +); + +`include "rtl/build_id.v" + +localparam CONF_STR = { + "MAYDAY;;", + "O34,Scanlines,Off,25%,50%,75%;", + "T6,Reset;", + "V,v1.0.0",`BUILD_DATE +}; + +assign LED = 1; + +wire clk_sys, clock_6, clock_1p79, clock_0p89; +wire pll_locked; +pll_mist pll( + .inclk0(CLOCK_27), + .areset(0), + .c0(clk_sys),//36 + .c1(clock_6),//6 + .c2(clock_1p79),//1.79 + .c3(clock_0p89),//0.89 + .locked(pll_locked) + ); + +wire [31:0] status; +wire [1:0] buttons; +wire [1:0] switches; +wire [7:0] joystick_0; +wire [7:0] joystick_1; +wire scandoublerD; +wire ypbpr; +wire [10:0] ps2_key; +wire [7:0] audio; +wire hs, vs; +wire blankn; +wire [2:0] g,b; +wire [1:0] r; + +wire [14:0] cart_addr; +wire [15:0] sdram_do; +wire cart_rd; +wire ioctl_downl; +wire [7:0] ioctl_index; +wire ioctl_wr; +wire [24:0] ioctl_addr; +wire [7:0] ioctl_dout; + +data_io data_io ( + .clk_sys ( clk_sys ), + .SPI_SCK ( SPI_SCK ), + .SPI_SS2 ( SPI_SS2 ), + .SPI_DI ( SPI_DI ), + .ioctl_download( ioctl_downl ), + .ioctl_index ( ioctl_index ), + .ioctl_wr ( ioctl_wr ), + .ioctl_addr ( ioctl_addr ), + .ioctl_dout ( ioctl_dout ) +); + +assign SDRAM_CLK = clk_sys; + +sdram cart +( + .*, + .init ( ~pll_locked ), + .clk ( clk_sys ), + .wtbt ( 2'b00 ), + .dout ( sdram_do ), + .din ( {ioctl_dout, ioctl_dout} ), + .addr ( ioctl_downl ? ioctl_addr : cart_addr ), + .we ( ioctl_downl & ioctl_wr ), + .rd ( !ioctl_downl), + .ready() +); + +reg reset = 1; +reg rom_loaded = 0; +always @(posedge clk_sys) begin + reg ioctl_downlD; + ioctl_downlD <= ioctl_downl; + + if (ioctl_downlD & ~ioctl_downl) rom_loaded <= 1; + reset <= status[0] | buttons[1] | status[6] | ~rom_loaded; +end + +defender defender ( + .clock_6 (clock_6), + .clk_1p79 (clock_1p79), + .clk_0p89 (clock_0p89), + .reset (reset), + + .video_r ( r ), + .video_g ( g ), + .video_b ( b ), + .video_hs ( hs ), + .video_vs ( vs ), + .video_blankn ( blankn ), + + .audio_out ( audio ), + + .roms_addr ( cart_addr ), + .roms_do ( sdram_do[7:0] ), + + .btn_two_players ( btn_two_players ),// + .btn_one_player ( btn_one_player ),// + .btn_left_coin ( btn_coin ),// + + .btn_auto_up(btn_auto_up),// + .btn_advance(btn_advance),// + .btn_service(btn_service),// + + + .btn_ffire(m_fire1),//SPACE + .btn_bfire(m_fire3),//CTRL + .btn_mayday(m_fire3),//ALT + + .btn_right(m_left | m_right), + .btn_down(m_down), + .btn_up(m_up), + + .sw_coktail_table(1) +); + +mist_video #(.COLOR_DEPTH(3), .SD_HCNT_WIDTH(10)) mist_video( + .clk_sys ( clk_sys ), + .SPI_SCK ( SPI_SCK ), + .SPI_SS3 ( SPI_SS3 ), + .SPI_DI ( SPI_DI ), + .R ( blankn ? {r, r[1] } : 0 ), + .G ( blankn ? g : 0 ), + .B ( blankn ? b : 0 ), + .HSync ( hs ), + .VSync ( vs ), + .VGA_R ( VGA_R ), + .VGA_G ( VGA_G ), + .VGA_B ( VGA_B ), + .VGA_VS ( VGA_VS ), + .VGA_HS ( VGA_HS ), + .rotate ( {1'b1,status[2]} ), + .scandoubler_disable( scandoublerD ), + .scanlines ( status[4:3] ), + .ypbpr ( ypbpr ) + ); + +user_io #( + .STRLEN(($size(CONF_STR)>>3))) +user_io( + .clk_sys (clk_sys ), + .conf_str (CONF_STR ), + .SPI_CLK (SPI_SCK ), + .SPI_SS_IO (CONF_DATA0 ), + .SPI_MISO (SPI_DO ), + .SPI_MOSI (SPI_DI ), + .buttons (buttons ), + .switches (switches ), + .scandoubler_disable (scandoublerD ), + .ypbpr (ypbpr ), + .key_strobe (key_strobe ), + .key_pressed (key_pressed ), + .key_code (key_code ), + .joystick_0 (joystick_0 ), + .joystick_1 (joystick_1 ), + .status (status ) + ); + +wire dac_o; +assign AUDIO_L = dac_o; +assign AUDIO_R = dac_o; + +dac #( + .C_bits(15)) +dac( + .clk_i(clk_sys), + .res_n_i(1), + .dac_i({audio,audio}), + .dac_o(dac_o) + ); + +wire m_up = btn_up | joystick_0[3] | joystick_1[3]; +wire m_down = btn_down | joystick_0[2] | joystick_1[2]; +wire m_left = btn_left | joystick_0[1] | joystick_1[1]; +wire m_right = btn_right | joystick_0[0] | joystick_1[0]; +wire m_fire1 = btn_fire1 | joystick_0[4] | joystick_1[4]; +wire m_fire2 = btn_fire2 | joystick_0[5] | joystick_1[5]; +wire m_fire3 = btn_fire3 | joystick_0[6] | joystick_1[6]; +wire m_fire4 = btn_fire4 | joystick_0[7] | joystick_1[7]; + +reg btn_one_player = 0; +reg btn_two_players = 0; +reg btn_left = 0; +reg btn_right = 0; +reg btn_down = 0; +reg btn_up = 0; +reg btn_fire1 = 0; +reg btn_fire2 = 0; +reg btn_fire3 = 0; +reg btn_fire4 = 0; +reg btn_coin = 0; +reg btn_advance = 0; +reg btn_auto_up = 0; +reg btn_service = 0; +wire key_pressed; +wire [7:0] key_code; +wire key_strobe; + +always @(posedge clk_sys) begin + if(key_strobe) begin + case(key_code) + 'h75: btn_up <= key_pressed; // up + 'h72: btn_down <= key_pressed; // down + 'h6B: btn_left <= key_pressed; // left + 'h74: btn_right <= key_pressed; // right + 'h76: btn_coin <= key_pressed; // ESC + 'h05: btn_one_player <= key_pressed; // F1 + 'h06: btn_two_players <= key_pressed; // F2 + 'h12: btn_fire4 <= key_pressed; // l shift + 'h14: btn_fire3 <= key_pressed; // ctrl + 'h11: btn_fire2 <= key_pressed; // alt + 'h29: btn_fire1 <= key_pressed; // Space + 'h1C: btn_advance <= key_pressed; // A + 'h3C: btn_auto_up <= key_pressed; // U + 'h33: btn_service <= key_pressed; // H + endcase + end +end + +endmodule diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/build_id.tcl b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/build_id.tcl new file mode 100644 index 00000000..938515d8 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/build_id.tcl @@ -0,0 +1,35 @@ +# ================================================================================ +# +# Build ID Verilog Module Script +# Jeff Wiencrot - 8/1/2011 +# +# Generates a Verilog module that contains a timestamp, +# from the current build. These values are available from the build_date, build_time, +# physical_address, and host_name output ports of the build_id module in the build_id.v +# Verilog source file. +# +# ================================================================================ + +proc generateBuildID_Verilog {} { + + # Get the timestamp (see: http://www.altera.com/support/examples/tcl/tcl-date-time-stamp.html) + set buildDate [ clock format [ clock seconds ] -format %y%m%d ] + set buildTime [ clock format [ clock seconds ] -format %H%M%S ] + + # Create a Verilog file for output + set outputFileName "rtl/build_id.v" + set outputFile [open $outputFileName "w"] + + # Output the Verilog source + puts $outputFile "`define BUILD_DATE \"$buildDate\"" + puts $outputFile "`define BUILD_TIME \"$buildTime\"" + close $outputFile + + # Send confirmation message to the Messages window + post_message "Generated build identification Verilog module: [pwd]/$outputFileName" + post_message "Date: $buildDate" + post_message "Time: $buildTime" +} + +# Comment out this line to prevent the process from automatically executing when the file is sourced: +generateBuildID_Verilog \ No newline at end of file diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/cpu09l_128.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/cpu09l_128.vhd new file mode 100644 index 00000000..12039bde --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/cpu09l_128.vhd @@ -0,0 +1,5906 @@ +--===========================================================================-- +-- -- +-- Synthesizable 6809 instruction compatible VHDL CPU core -- +-- -- +--===========================================================================-- +-- +-- File name : cpu09l.vhd +-- +-- Entity name : cpu09 +-- +-- Purpose : 6809 instruction compatible CPU core written in VHDL +-- with Last Instruction Cycle, bus available, bus status, +-- and instruction fetch signals. +-- Not cycle compatible with the original 6809 CPU +-- +-- Dependencies : ieee.std_logic_1164 +-- ieee.std_logic_unsigned +-- +-- Author : John E. Kent +-- +-- Email : dilbert57@opencores.org +-- +-- Web : http://opencores.org/project,system09 +-- +-- Description : VMA (valid memory address) is hight whenever a valid memory +-- access is made by an instruction fetch, interrupt vector fetch +-- or a data read or write otherwise it is low indicating an idle +-- bus cycle. +-- IFETCH (instruction fetch output) is high whenever an +-- instruction byte is read i.e. the program counter is applied +-- to the address bus. +-- LIC (last instruction cycle output) is normally low +-- but goes high on the last cycle of an instruction. +-- BA (bus available output) is normally low but goes high while +-- waiting in a Sync instruction state or the CPU is halted +-- i.e. a DMA grant. +-- BS (bus status output) is normally low but goes high during an +-- interrupt or reset vector fetch or the processor is halted +-- i.e. a DMA grant. +-- +-- Copyright (C) 2003 - 2010 John Kent +-- +-- This program is free software: you can redistribute it and/or modify +-- it under the terms of the GNU General Public License as published by +-- the Free Software Foundation, either version 3 of the License, or +-- (at your option) any later version. +-- +-- This program is distributed in the hope that it will be useful, +-- but WITHOUT ANY WARRANTY; without even the implied warranty of +-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +-- GNU General Public License for more details. +-- +-- You should have received a copy of the GNU General Public License +-- along with this program. If not, see . +-- +--===========================================================================-- +-- -- +-- Revision History -- +-- -- +--===========================================================================-- +-- +-- Version 0.1 - 26 June 2003 - John Kent +-- Added extra level in state stack +-- fixed some calls to the extended addressing state +-- +-- Version 0.2 - 5 Sept 2003 - John Kent +-- Fixed 16 bit indexed offset (was doing read rather than fetch) +-- Added/Fixed STY and STS instructions. +-- ORCC_STATE ANDed CC state rather than ORed it - Now fixed +-- CMPX Loaded ACCA and ACCB - Now fixed +-- +-- Version 1.0 - 6 Sep 2003 - John Kent +-- Initial release to Open Cores +-- reversed clock edge +-- +-- Version 1.1 - 29 November 2003 John kent +-- ACCA and ACCB indexed offsets are 2's complement. +-- ALU Right Mux now sign extends ACCA & ACCB offsets +-- Absolute Indirect addressing performed a read on the +-- second byte of the address rather than a fetch +-- so it formed an incorrect address. Now fixed. +-- +-- Version 1.2 - 29 November 2003 John Kent +-- LEAX and LEAY affect the Z bit only +-- LEAS and LEAU do not affect any condition codes +-- added an extra ALU control for LEA. +-- +-- Version 1.3 - 12 December 2003 John Kent +-- CWAI did not work, was missed a PUSH_ST on calling +-- the ANDCC_STATE. Thanks go to Ghassan Kraidy for +-- finding this fault. +-- +-- Version 1.4 - 12 December 2003 John Kent +-- Missing cc_ctrl assignment in otherwise case of +-- lea_state resulted in cc_ctrl being latched in +-- that state. +-- The otherwise statement should never be reached, +-- and has been fixed simply to resolve synthesis warnings. +-- +-- Version 1.5 - 17 january 2004 John kent +-- The clear instruction used "alu_ld8" to control the ALU +-- rather than "alu_clr". This mean the Carry was not being +-- cleared correctly. +-- +-- Version 1.6 - 24 January 2004 John Kent +-- Fixed problems in PSHU instruction +-- +-- Version 1.7 - 25 January 2004 John Kent +-- removed redundant "alu_inx" and "alu_dex' +-- Removed "test_alu" and "test_cc" +-- STD instruction did not set condition codes +-- JMP direct was not decoded properly +-- CLR direct performed an unwanted read cycle +-- Bogus "latch_md" in Page2 indexed addressing +-- +-- Version 1.8 - 27 January 2004 John Kent +-- CWAI in decode1_state should increment the PC. +-- ABX is supposed to be an unsigned addition. +-- Added extra ALU function +-- ASR8 slightly changed in the ALU. +-- +-- Version 1.9 - 20 August 2005 +-- LSR8 is now handled in ASR8 and ROR8 case in the ALU, +-- rather than LSR16. There was a problem with single +-- operand instructions using the MD register which is +-- sign extended on the first 8 bit fetch. +-- +-- Version 1.10 - 13 September 2005 +-- TFR & EXG instructions did not work for the Condition Code Register +-- An extra case has been added to the ALU for the alu_tfr control +-- to assign the left ALU input (alu_left) to the condition code +-- outputs (cc_out). +-- +-- Version 1.11 - 16 September 2005 +-- JSR ,X should not predecrement S before calculating the jump address. +-- The reason is that JSR [0,S] needs S to point to the top of the stack +-- to fetch a valid vector address. The solution is to have the addressing +-- mode microcode called before decrementing S and then decrementing S in +-- JSR_STATE. JSR_STATE in turn calls PUSH_RETURN_LO_STATE rather than +-- PUSH_RETURN_HI_STATE so that both the High & Low halves of the PC are +-- pushed on the stack. This adds one extra bus cycle, but resolves the +-- addressing conflict. I've also removed the pre-decement S in +-- JSR EXTENDED as it also calls JSR_STATE. +-- +-- Version 1.12 - 6th June 2006 +-- 6809 Programming reference manual says V is not affected by ASR, LSR and ROR +-- This is different to the 6800. CLR should reset the V bit. +-- +-- Version 1.13 - 7th July 2006 +-- Disable NMI on reset until S Stack pointer has been loaded. +-- Added nmi_enable signal in sp_reg process and nmi_handler process. +-- +-- Version 1.14 - 11th July 2006 +-- 1. Added new state to RTI called rti_entire_state. +-- This state tests the CC register after it has been loaded +-- from the stack. Previously the current CC was tested which +-- was incorrect. The Entire Flag should be set before the +-- interrupt stacks the CC. +-- 2. On bogus Interrupts, int_cc_state went to rti_state, +-- which was an enumerated state, but not defined anywhere. +-- rti_state has been changed to rti_cc_state so that bogus interrupt +-- will perform an RTI after entering that state. +-- 3. Sync should generate an interrupt if the interrupt masks +-- are cleared. If the interrupt masks are set, then an interrupt +-- will cause the the PC to advance to the next instruction. +-- Note that I don't wait for an interrupt to be asserted for +-- three clock cycles. +-- 4. Added new ALU control state "alu_mul". "alu_mul" is used in +-- the Multiply instruction replacing "alu_add16". This is similar +-- to "alu_add16" except it sets the Carry bit to B7 of the result +-- in ACCB, sets the Zero bit if the 16 bit result is zero, but +-- does not affect The Half carry (H), Negative (N) or Overflow (V) +-- flags. The logic was re-arranged so that it adds md or zero so +-- that the Carry condition code is set on zero multiplicands. +-- 5. DAA (Decimal Adjust Accumulator) should set the Negative (N) +-- and Zero Flags. It will also affect the Overflow (V) flag although +-- the operation is undefined. It's anyones guess what DAA does to V. +-- +-- Version 1.15 - 25th Feb 2007 - John Kent +-- line 9672 changed "if Halt <= '1' then" to "if Halt = '1' then" +-- Changed sensitivity lists. +-- +-- Version 1.16 - 5th February 2008 - John Kent +-- FIRQ interrupts should take priority over IRQ Interrupts. +-- This presumably means they should be tested for before IRQ +-- when they happen concurrently. +-- +-- Version 1.17 - 18th February 2008 - John Kent +-- NMI in CWAI should mask IRQ and FIRQ interrupts +-- +-- Version 1.18 - 21st February 2008 - John Kent +-- Removed default register settings in each case statement +-- and placed them at the beginning of the state sequencer. +-- Modified the SYNC instruction so that the interrupt vector(iv) +-- is not set unless an unmasked FIRQ or IRQ is received. +-- +-- Version 1.19 - 25th February 2008 - John Kent +-- Enumerated separate states for FIRQ/FAST and NMIIRQ/ENTIRE +-- Enumerated separate states for MASKI and MASKIF states +-- Removed code on BSR/JSR in fetch cycle +-- +-- Version 1.20 - 8th October 2011 - John Kent +-- added fetch output which should go high during the fetch cycle +-- +-- Version 1.21 - 8th October 2011 - John Kent +-- added Last Instruction Cycle signal +-- replaced fetch with ifetch (instruction fetch) signal +-- added ba & bs (bus available & bus status) signals +-- +-- Version 1.22 - 2011-10-29 John Kent +-- The halt state isn't correct. +-- The halt state is entered into from the fetch_state +-- It returned to the fetch state which may re-run an execute cycle +-- on the accumulator and it won't necessarily be the last instruction cycle +-- I've changed the halt state to return to the decode1_state +-- +-- Version 1.23 - 2011-10-30 John Kent +-- sample halt in the change_state process if lic is high (last instruction cycle) +-- +-- Version 1.24 - 2011-11-01 John Kent +-- Handle interrupts in change_state process +-- Sample interrupt inputs on last instruction cycle +-- Remove iv_ctrl and implement iv (interrupt vector) in change_state process. +-- Generate fic (first instruction cycle) from lic (last instruction cycle) +-- and use it to complete the dual operand execute cycle before servicing +-- halt or interrupts requests. +-- rename lic to lic_out on the entity declaration so that lic can be tested internally. +-- add int_firq1_state and int_nmirq1_state to allow for the dual operand execute cycle +-- integrated nmi_ctrl into change_state process +-- Reduces the microcode state stack to one entry (saved_state) +-- imm16_state jumps directly to the fetch_state +-- pull_return_lo states jumps directly to the fetch_state +-- duplicate andcc_state as cwai_state +-- rename exg1_state as exg2 state and duplicate tfr_state as exg1_state +-- +-- Version 1.25 - 2011-11-27 John Kent +-- Changed the microcode for saving registers on an interrupt into a microcode subroutine. +-- Removed SWI servicing from the change state process and made SWI, SWI2 & SWI3 +-- call the interrupt microcode subroutine. +-- Added additional states for nmi, and irq for interrupt servicing. +-- Added additional states for nmi/irq, firq, and swi interrupts to mask I & F flags. +-- +-- Version 1.26 - 2013-03-18 John Kent +-- pre-initialized cond_true variable to true in state sequencer +-- re-arranged change_state process slightly +-- +-- Version 1.27 - 2015-05-30 John Kent +-- Added test in state machine for masked IRQ and FIRQ in Sync_state. +-- +-- Version 1.28 - 2015-05-30 John Kent. +-- Moved IRQ and FIRQ test from state machine to the state sequencer Sync_state. +-- +library ieee; +use ieee.std_logic_1164.all; +use ieee.std_logic_unsigned.all; + +entity cpu09 is + port ( + clk : in std_logic; -- E clock input (falling edge) + rst : in std_logic; -- reset input (active high) + vma : out std_logic; -- valid memory address (active high) + lic_out : out std_logic; -- last instruction cycle (active high) + ifetch : out std_logic; -- instruction fetch cycle (active high) + opfetch : out std_logic; -- opcode fetch (active high) + ba : out std_logic; -- bus available (high on sync wait or DMA grant) + bs : out std_logic; -- bus status (high on interrupt or reset vector fetch or DMA grant) + addr : out std_logic_vector(15 downto 0); -- address bus output + rw : out std_logic; -- read not write output + data_out : out std_logic_vector(7 downto 0); -- data bus output + data_in : in std_logic_vector(7 downto 0); -- data bus input + irq : in std_logic; -- interrupt request input (active high) + firq : in std_logic; -- fast interrupt request input (active high) + nmi : in std_logic; -- non maskable interrupt request input (active high) + halt : in std_logic; -- halt input (active high) grants DMA + hold : in std_logic -- hold input (active high) extend bus cycle + ); +end cpu09; + +architecture rtl of cpu09 is + + constant EBIT : integer := 7; + constant FBIT : integer := 6; + constant HBIT : integer := 5; + constant IBIT : integer := 4; + constant NBIT : integer := 3; + constant ZBIT : integer := 2; + constant VBIT : integer := 1; + constant CBIT : integer := 0; + + -- + -- Interrupt vector modifiers + -- + constant RST_VEC : std_logic_vector(2 downto 0) := "111"; + constant NMI_VEC : std_logic_vector(2 downto 0) := "110"; + constant SWI_VEC : std_logic_vector(2 downto 0) := "101"; + constant IRQ_VEC : std_logic_vector(2 downto 0) := "100"; + constant FIRQ_VEC : std_logic_vector(2 downto 0) := "011"; + constant SWI2_VEC : std_logic_vector(2 downto 0) := "010"; + constant SWI3_VEC : std_logic_vector(2 downto 0) := "001"; + constant RESV_VEC : std_logic_vector(2 downto 0) := "000"; + + type state_type is (-- Start off in Reset + reset_state, + -- Fetch Interrupt Vectors (including reset) + vect_lo_state, vect_hi_state, vect_idle_state, + -- Fetch Instruction Cycle + fetch_state, + -- Decode Instruction Cycles + decode1_state, decode2_state, decode3_state, + -- Calculate Effective Address + imm16_state, + indexed_state, index8_state, index16_state, index16_2_state, + pcrel8_state, pcrel16_state, pcrel16_2_state, + indexaddr_state, indexaddr2_state, + postincr1_state, postincr2_state, + indirect_state, indirect2_state, indirect3_state, + extended_state, + -- single ops + single_op_read_state, + single_op_exec_state, + single_op_write_state, + -- Dual op states + dual_op_read8_state, dual_op_read16_state, dual_op_read16_2_state, + dual_op_write8_state, dual_op_write16_state, + -- + sync_state, halt_state, cwai_state, + -- + andcc_state, orcc_state, + tfr_state, + exg_state, exg1_state, exg2_state, + lea_state, + -- Multiplication + mul_state, mulea_state, muld_state, + mul0_state, mul1_state, mul2_state, mul3_state, + mul4_state, mul5_state, mul6_state, mul7_state, + -- Branches + lbranch_state, sbranch_state, + -- Jumps, Subroutine Calls and Returns + jsr_state, jmp_state, + push_return_hi_state, push_return_lo_state, + pull_return_hi_state, pull_return_lo_state, + -- Interrupt cycles + int_nmi_state, int_nmi1_state, + int_irq_state, int_irq1_state, + int_firq_state, int_firq1_state, + int_entire_state, int_fast_state, + int_pcl_state, int_pch_state, + int_upl_state, int_uph_state, + int_iyl_state, int_iyh_state, + int_ixl_state, int_ixh_state, + int_dp_state, + int_accb_state, int_acca_state, + int_cc_state, + int_cwai_state, + int_nmimask_state, int_firqmask_state, int_swimask_state, int_irqmask_state, + -- Return From Interrupt + rti_cc_state, rti_entire_state, + rti_acca_state, rti_accb_state, + rti_dp_state, + rti_ixl_state, rti_ixh_state, + rti_iyl_state, rti_iyh_state, + rti_upl_state, rti_uph_state, + rti_pcl_state, rti_pch_state, + -- Push Registers using SP + pshs_state, + pshs_pcl_state, pshs_pch_state, + pshs_upl_state, pshs_uph_state, + pshs_iyl_state, pshs_iyh_state, + pshs_ixl_state, pshs_ixh_state, + pshs_dp_state, + pshs_acca_state, pshs_accb_state, + pshs_cc_state, + -- Pull Registers using SP + puls_state, + puls_cc_state, + puls_acca_state, puls_accb_state, + puls_dp_state, + puls_ixl_state, puls_ixh_state, + puls_iyl_state, puls_iyh_state, + puls_upl_state, puls_uph_state, + puls_pcl_state, puls_pch_state, + -- Push Registers using UP + pshu_state, + pshu_pcl_state, pshu_pch_state, + pshu_spl_state, pshu_sph_state, + pshu_iyl_state, pshu_iyh_state, + pshu_ixl_state, pshu_ixh_state, + pshu_dp_state, + pshu_acca_state, pshu_accb_state, + pshu_cc_state, + -- Pull Registers using UP + pulu_state, + pulu_cc_state, + pulu_acca_state, pulu_accb_state, + pulu_dp_state, + pulu_ixl_state, pulu_ixh_state, + pulu_iyl_state, pulu_iyh_state, + pulu_spl_state, pulu_sph_state, + pulu_pcl_state, pulu_pch_state ); + + type st_type is (reset_st, push_st, idle_st ); + type iv_type is (latch_iv, swi3_iv, swi2_iv, firq_iv, irq_iv, swi_iv, nmi_iv, reset_iv); + type addr_type is (idle_ad, fetch_ad, read_ad, write_ad, pushu_ad, pullu_ad, pushs_ad, pulls_ad, int_hi_ad, int_lo_ad ); + type dout_type is (cc_dout, acca_dout, accb_dout, dp_dout, + ix_lo_dout, ix_hi_dout, iy_lo_dout, iy_hi_dout, + up_lo_dout, up_hi_dout, sp_lo_dout, sp_hi_dout, + pc_lo_dout, pc_hi_dout, md_lo_dout, md_hi_dout ); + type op_type is (reset_op, fetch_op, latch_op ); + type pre_type is (reset_pre, fetch_pre, latch_pre ); + type cc_type is (reset_cc, load_cc, pull_cc, latch_cc ); + type acca_type is (reset_acca, load_acca, load_hi_acca, pull_acca, latch_acca ); + type accb_type is (reset_accb, load_accb, pull_accb, latch_accb ); + type dp_type is (reset_dp, load_dp, pull_dp, latch_dp ); + type ix_type is (reset_ix, load_ix, pull_lo_ix, pull_hi_ix, latch_ix ); + type iy_type is (reset_iy, load_iy, pull_lo_iy, pull_hi_iy, latch_iy ); + type sp_type is (reset_sp, latch_sp, load_sp, pull_hi_sp, pull_lo_sp ); + type up_type is (reset_up, latch_up, load_up, pull_hi_up, pull_lo_up ); + type pc_type is (reset_pc, latch_pc, load_pc, pull_lo_pc, pull_hi_pc, incr_pc ); + type md_type is (reset_md, latch_md, load_md, fetch_first_md, fetch_next_md, shiftl_md ); + type ea_type is (reset_ea, latch_ea, load_ea, fetch_first_ea, fetch_next_ea ); + type left_type is (cc_left, acca_left, accb_left, dp_left, + ix_left, iy_left, up_left, sp_left, + accd_left, md_left, pc_left, ea_left ); + type right_type is (ea_right, zero_right, one_right, two_right, + acca_right, accb_right, accd_right, + md_right, md_sign5_right, md_sign8_right ); + type alu_type is (alu_add8, alu_sub8, alu_add16, alu_sub16, alu_adc, alu_sbc, + alu_and, alu_ora, alu_eor, + alu_tst, alu_inc, alu_dec, alu_clr, alu_neg, alu_com, + alu_lsr16, alu_lsl16, + alu_ror8, alu_rol8, alu_mul, + alu_asr8, alu_asl8, alu_lsr8, + alu_andcc, alu_orcc, alu_sex, alu_tfr, alu_abx, + alu_seif, alu_sei, alu_see, alu_cle, + alu_ld8, alu_st8, alu_ld16, alu_st16, alu_lea, alu_nop, alu_daa ); + + signal op_code: std_logic_vector(7 downto 0); + signal pre_code: std_logic_vector(7 downto 0); + signal acca: std_logic_vector(7 downto 0); + signal accb: std_logic_vector(7 downto 0); + signal cc: std_logic_vector(7 downto 0); + signal cc_out: std_logic_vector(7 downto 0); + signal dp: std_logic_vector(7 downto 0); + signal xreg: std_logic_vector(15 downto 0); + signal yreg: std_logic_vector(15 downto 0); + signal sp: std_logic_vector(15 downto 0); + signal up: std_logic_vector(15 downto 0); + signal ea: std_logic_vector(15 downto 0); + signal pc: std_logic_vector(15 downto 0); + signal md: std_logic_vector(15 downto 0); + signal left: std_logic_vector(15 downto 0); + signal right: std_logic_vector(15 downto 0); + signal out_alu: std_logic_vector(15 downto 0); + signal iv: std_logic_vector(2 downto 0); + signal nmi_req: std_logic; + signal nmi_ack: std_logic; + signal nmi_enable: std_logic; + signal fic: std_logic; -- first instruction cycle + signal lic: std_logic; -- last instruction cycle + + signal state: state_type; + signal next_state: state_type; + signal return_state: state_type; + signal saved_state: state_type; + signal st_ctrl: st_type; + signal iv_ctrl: iv_type; + signal pc_ctrl: pc_type; + signal ea_ctrl: ea_type; + signal op_ctrl: op_type; + signal pre_ctrl: pre_type; + signal md_ctrl: md_type; + signal acca_ctrl: acca_type; + signal accb_ctrl: accb_type; + signal ix_ctrl: ix_type; + signal iy_ctrl: iy_type; + signal cc_ctrl: cc_type; + signal dp_ctrl: dp_type; + signal sp_ctrl: sp_type; + signal up_ctrl: up_type; + signal left_ctrl: left_type; + signal right_ctrl: right_type; + signal alu_ctrl: alu_type; + signal addr_ctrl: addr_type; + signal dout_ctrl: dout_type; + + +begin + +---------------------------------- +-- +-- State machine stack +-- +---------------------------------- +--state_stack_proc: process( clk, hold, state_stack, st_ctrl, +-- return_state, fetch_state ) +state_stack_proc: process( clk, st_ctrl, return_state ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case st_ctrl is + when reset_st => + saved_state <= fetch_state; + when push_st => + saved_state <= return_state; + when others => + null; + end case; + end if; + end if; +end process; + +---------------------------------- +-- +-- Interrupt Vector control +-- +---------------------------------- +-- +int_vec_proc: process( clk, iv_ctrl ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case iv_ctrl is + when reset_iv => + iv <= RST_VEC; + when nmi_iv => + iv <= NMI_VEC; + when swi_iv => + iv <= SWI_VEC; + when irq_iv => + iv <= IRQ_VEC; + when firq_iv => + iv <= FIRQ_VEC; + when swi2_iv => + iv <= SWI2_VEC; + when swi3_iv => + iv <= SWI3_VEC; + when others => + null; + end case; + end if; -- hold + end if; -- clk +end process; + +---------------------------------- +-- +-- Program Counter Control +-- +---------------------------------- + +--pc_reg: process( clk, pc_ctrl, hold, pc, out_alu, data_in ) +pc_reg: process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case pc_ctrl is + when reset_pc => + pc <= (others=>'0'); + when load_pc => + pc <= out_alu(15 downto 0); + when pull_lo_pc => + pc(7 downto 0) <= data_in; + when pull_hi_pc => + pc(15 downto 8) <= data_in; + when incr_pc => + pc <= pc + 1; + when others => + null; + end case; + end if; + end if; +end process; + +---------------------------------- +-- +-- Effective Address Control +-- +---------------------------------- + +--ea_reg: process( clk, ea_ctrl, hold, ea, out_alu, data_in, dp ) +ea_reg: process( clk ) +begin + + if clk'event and clk = '0' then + if hold= '0' then + case ea_ctrl is + when reset_ea => + ea <= (others=>'0'); + when fetch_first_ea => + ea(7 downto 0) <= data_in; + ea(15 downto 8) <= dp; + when fetch_next_ea => + ea(15 downto 8) <= ea(7 downto 0); + ea(7 downto 0) <= data_in; + when load_ea => + ea <= out_alu(15 downto 0); + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- Accumulator A +-- +-------------------------------- +--acca_reg : process( clk, acca_ctrl, hold, out_alu, acca, data_in ) +acca_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case acca_ctrl is + when reset_acca => + acca <= (others=>'0'); + when load_acca => + acca <= out_alu(7 downto 0); + when load_hi_acca => + acca <= out_alu(15 downto 8); + when pull_acca => + acca <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- Accumulator B +-- +-------------------------------- +--accb_reg : process( clk, accb_ctrl, hold, out_alu, accb, data_in ) +accb_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case accb_ctrl is + when reset_accb => + accb <= (others=>'0'); + when load_accb => + accb <= out_alu(7 downto 0); + when pull_accb => + accb <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- X Index register +-- +-------------------------------- +--ix_reg : process( clk, ix_ctrl, hold, out_alu, xreg, data_in ) +ix_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case ix_ctrl is + when reset_ix => + xreg <= (others=>'0'); + when load_ix => + xreg <= out_alu(15 downto 0); + when pull_hi_ix => + xreg(15 downto 8) <= data_in; + when pull_lo_ix => + xreg(7 downto 0) <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- Y Index register +-- +-------------------------------- +--iy_reg : process( clk, iy_ctrl, hold, out_alu, yreg, data_in ) +iy_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case iy_ctrl is + when reset_iy => + yreg <= (others=>'0'); + when load_iy => + yreg <= out_alu(15 downto 0); + when pull_hi_iy => + yreg(15 downto 8) <= data_in; + when pull_lo_iy => + yreg(7 downto 0) <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- S stack pointer +-- +-------------------------------- +--sp_reg : process( clk, sp_ctrl, hold, sp, out_alu, data_in, nmi_enable ) +sp_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case sp_ctrl is + when reset_sp => + sp <= (others=>'0'); + nmi_enable <= '0'; + when load_sp => + sp <= out_alu(15 downto 0); + nmi_enable <= '1'; + when pull_hi_sp => + sp(15 downto 8) <= data_in; + when pull_lo_sp => + sp(7 downto 0) <= data_in; + nmi_enable <= '1'; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- U stack pointer +-- +-------------------------------- +--up_reg : process( clk, up_ctrl, hold, up, out_alu, data_in ) +up_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case up_ctrl is + when reset_up => + up <= (others=>'0'); + when load_up => + up <= out_alu(15 downto 0); + when pull_hi_up => + up(15 downto 8) <= data_in; + when pull_lo_up => + up(7 downto 0) <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- Memory Data +-- +-------------------------------- +--md_reg : process( clk, md_ctrl, hold, out_alu, data_in, md ) +md_reg : process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case md_ctrl is + when reset_md => + md <= (others=>'0'); + when load_md => + md <= out_alu(15 downto 0); + when fetch_first_md => -- sign extend md for branches + md(15 downto 8) <= data_in(7) & data_in(7) & data_in(7) & data_in(7) & + data_in(7) & data_in(7) & data_in(7) & data_in(7) ; + md(7 downto 0) <= data_in; + when fetch_next_md => + md(15 downto 8) <= md(7 downto 0); + md(7 downto 0) <= data_in; + when shiftl_md => + md(15 downto 1) <= md(14 downto 0); + md(0) <= '0'; + when others => + null; + end case; + end if; + end if; +end process; + + +---------------------------------- +-- +-- Condition Codes +-- +---------------------------------- + +--cc_reg: process( clk, cc_ctrl, hold, cc_out, cc, data_in ) +cc_reg: process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case cc_ctrl is + when reset_cc => + cc <= "11010000"; -- set EBIT, FBIT & IBIT + when load_cc => + cc <= cc_out; + when pull_cc => + cc <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +---------------------------------- +-- +-- Direct Page register +-- +---------------------------------- + +--dp_reg: process( clk, dp_ctrl, hold, out_alu, dp, data_in ) +dp_reg: process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case dp_ctrl is + when reset_dp => + dp <= (others=>'0'); + when load_dp => + dp <= out_alu(7 downto 0); + when pull_dp => + dp <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + + +---------------------------------- +-- +-- op code register +-- +---------------------------------- + +--op_reg: process( clk, op_ctrl, hold, op_code, data_in ) +op_reg: process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case op_ctrl is + when reset_op => + op_code <= "00010010"; + when fetch_op => + op_code <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + + +---------------------------------- +-- +-- pre byte op code register +-- +---------------------------------- + +--pre_reg: process( clk, pre_ctrl, hold, pre_code, data_in ) +pre_reg: process( clk ) +begin + if clk'event and clk = '0' then + if hold = '0' then + case pre_ctrl is + when reset_pre => + pre_code <= (others=>'0'); + when fetch_pre => + pre_code <= data_in; + when others => + null; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- state machine +-- +-------------------------------- + +--change_state: process( clk, rst, state, hold, next_state ) +change_state: process( clk ) +begin + if clk'event and clk = '0' then + if rst = '1' then + fic <= '0'; + nmi_ack <= '0'; + state <= reset_state; + elsif hold = '0' then + fic <= lic; + -- + -- nmi request is not cleared until nmi input goes low + -- + if (nmi_req = '0') and (nmi_ack='1') then + nmi_ack <= '0'; + end if; + + if (nmi_req = '1') and (nmi_ack = '0') and (state = int_nmimask_state) then + nmi_ack <= '1'; + end if; + + if lic = '1' then + if halt = '1' then + state <= halt_state; + + -- service non maskable interrupts + elsif (nmi_req = '1') and (nmi_ack = '0') then + state <= int_nmi_state; + -- + -- FIRQ & IRQ are level sensitive + -- + elsif (firq = '1') and (cc(FBIT) = '0') then + state <= int_firq_state; + + elsif (irq = '1') and (cc(IBIT) = '0') then + state <= int_irq_state; + -- + -- Version 1.27 2015-05-30 + -- Exit sync_state on masked interrupt. + -- + -- Version 1.28 2015-05-30 + -- Move this code to the state sequencer + -- near line 5566. + -- + -- elsif (state = sync_state) and ((firq = '1') or (irq = '1'))then + -- state <= fetch_state; + -- + else + state <= next_state; + end if; -- halt, nmi, firq, irq + else + state <= next_state; + end if; -- lic + end if; -- reset/hold + end if; -- clk +end process; + +------------------------------------ +-- +-- Detect Edge of NMI interrupt +-- +------------------------------------ + +--nmi_handler : process( clk, rst, nmi, nmi_ack, nmi_req, nmi_enable ) +nmi_handler : process( rst, clk ) +begin + if rst='1' then + nmi_req <= '0'; + elsif clk'event and clk='0' then + if (nmi='1') and (nmi_ack='0') and (nmi_enable='1') then + nmi_req <= '1'; + else + if (nmi='0') and (nmi_ack='1') then + nmi_req <= '0'; + end if; + end if; + end if; +end process; + + +---------------------------------- +-- +-- Address output multiplexer +-- +---------------------------------- + +addr_mux: process( addr_ctrl, pc, ea, up, sp, iv ) +begin + ifetch <= '0'; + vma <= '1'; + case addr_ctrl is + when fetch_ad => + addr <= pc; + rw <= '1'; + ifetch <= '1'; + when read_ad => + addr <= ea; + rw <= '1'; + when write_ad => + addr <= ea; + rw <= '0'; + when pushs_ad => + addr <= sp; + rw <= '0'; + when pulls_ad => + addr <= sp; + rw <= '1'; + when pushu_ad => + addr <= up; + rw <= '0'; + when pullu_ad => + addr <= up; + rw <= '1'; + when int_hi_ad => + addr <= "111111111111" & iv & "0"; + rw <= '1'; + when int_lo_ad => + addr <= "111111111111" & iv & "1"; + rw <= '1'; + when others => + addr <= "1111111111111111"; + rw <= '1'; + vma <= '0'; + end case; +end process; + +-------------------------------- +-- +-- Data Bus output +-- +-------------------------------- +dout_mux : process( dout_ctrl, md, acca, accb, dp, xreg, yreg, sp, up, pc, cc ) +begin + case dout_ctrl is + when cc_dout => -- condition code register + data_out <= cc; + when acca_dout => -- accumulator a + data_out <= acca; + when accb_dout => -- accumulator b + data_out <= accb; + when dp_dout => -- direct page register + data_out <= dp; + when ix_lo_dout => -- X index reg + data_out <= xreg(7 downto 0); + when ix_hi_dout => -- X index reg + data_out <= xreg(15 downto 8); + when iy_lo_dout => -- Y index reg + data_out <= yreg(7 downto 0); + when iy_hi_dout => -- Y index reg + data_out <= yreg(15 downto 8); + when up_lo_dout => -- U stack pointer + data_out <= up(7 downto 0); + when up_hi_dout => -- U stack pointer + data_out <= up(15 downto 8); + when sp_lo_dout => -- S stack pointer + data_out <= sp(7 downto 0); + when sp_hi_dout => -- S stack pointer + data_out <= sp(15 downto 8); + when md_lo_dout => -- alu output + data_out <= md(7 downto 0); + when md_hi_dout => -- alu output + data_out <= md(15 downto 8); + when pc_lo_dout => -- low order pc + data_out <= pc(7 downto 0); + when pc_hi_dout => -- high order pc + data_out <= pc(15 downto 8); + end case; +end process; + +---------------------------------- +-- +-- Left Mux +-- +---------------------------------- + +left_mux: process( left_ctrl, acca, accb, cc, dp, xreg, yreg, up, sp, pc, ea, md ) +begin + case left_ctrl is + when cc_left => + left(15 downto 8) <= "00000000"; + left(7 downto 0) <= cc; + when acca_left => + left(15 downto 8) <= "00000000"; + left(7 downto 0) <= acca; + when accb_left => + left(15 downto 8) <= "00000000"; + left(7 downto 0) <= accb; + when dp_left => + left(15 downto 8) <= "00000000"; + left(7 downto 0) <= dp; + when accd_left => + left(15 downto 8) <= acca; + left(7 downto 0) <= accb; + when md_left => + left <= md; + when ix_left => + left <= xreg; + when iy_left => + left <= yreg; + when sp_left => + left <= sp; + when up_left => + left <= up; + when pc_left => + left <= pc; + when others => +-- when ea_left => + left <= ea; + end case; +end process; + +---------------------------------- +-- +-- Right Mux +-- +---------------------------------- + +right_mux: process( right_ctrl, md, acca, accb, ea ) +begin + case right_ctrl is + when ea_right => + right <= ea; + when zero_right => + right <= "0000000000000000"; + when one_right => + right <= "0000000000000001"; + when two_right => + right <= "0000000000000010"; + when acca_right => + if acca(7) = '0' then + right <= "00000000" & acca(7 downto 0); + else + right <= "11111111" & acca(7 downto 0); + end if; + when accb_right => + if accb(7) = '0' then + right <= "00000000" & accb(7 downto 0); + else + right <= "11111111" & accb(7 downto 0); + end if; + when accd_right => + right <= acca & accb; + when md_sign5_right => + if md(4) = '0' then + right <= "00000000000" & md(4 downto 0); + else + right <= "11111111111" & md(4 downto 0); + end if; + when md_sign8_right => + if md(7) = '0' then + right <= "00000000" & md(7 downto 0); + else + right <= "11111111" & md(7 downto 0); + end if; + when others => +-- when md_right => + right <= md; + end case; +end process; + +---------------------------------- +-- +-- Arithmetic Logic Unit +-- +---------------------------------- + +alu: process( alu_ctrl, cc, left, right, out_alu, cc_out ) +variable valid_lo, valid_hi : boolean; +variable carry_in : std_logic; +variable daa_reg : std_logic_vector(7 downto 0); +begin + + case alu_ctrl is + when alu_adc | alu_sbc | + alu_rol8 | alu_ror8 => + carry_in := cc(CBIT); + when alu_asr8 => + carry_in := left(7); + when others => + carry_in := '0'; + end case; + + valid_lo := left(3 downto 0) <= 9; + valid_hi := left(7 downto 4) <= 9; + + -- + -- CBIT HBIT VHI VLO DAA + -- 0 0 0 0 66 (!VHI : hi_nybble>8) + -- 0 0 0 1 60 + -- 0 0 1 1 00 + -- 0 0 1 0 06 ( VHI : hi_nybble<=8) + -- + -- 0 1 1 0 06 + -- 0 1 1 1 06 + -- 0 1 0 1 66 + -- 0 1 0 0 66 + -- + -- 1 1 0 0 66 + -- 1 1 0 1 66 + -- 1 1 1 1 66 + -- 1 1 1 0 66 + -- + -- 1 0 1 0 66 + -- 1 0 1 1 60 + -- 1 0 0 1 60 + -- 1 0 0 0 66 + -- + -- 66 = (!VHI & !VLO) + (CBIT & HBIT) + (HBIT & !VHI) + (CBIT & !VLO) + -- = (CBIT & (HBIT + !VLO)) + (!VHI & (HBIT + !VLO)) + -- = (!VLO & (CBIT + !VHI)) + (HBIT & (CBIT + !VHI)) + -- 60 = (CBIT & !HBIT & VLO) + (!HBIT & !VHI & VLO) + -- = (!HBIT & VLO & (CBIT + !VHI)) + -- 06 = (!CBIT & VHI & (!VLO + VHI) + -- 00 = (!CBIT & !HBIT & VHI & VLO) + -- + if (cc(CBIT) = '0') then + -- CBIT=0 + if( cc(HBIT) = '0' ) then + -- HBIT=0 + if valid_lo then + -- lo <= 9 (no overflow in low nybble) + if valid_hi then + -- hi <= 9 (no overflow in either low or high nybble) + daa_reg := "00000000"; + else + -- hi > 9 (overflow in high nybble only) + daa_reg := "01100000"; + end if; + else + -- lo > 9 (overflow in low nybble) + -- + -- since there is already an overflow in the low nybble + -- you need to make room in the high nybble for the low nybble carry + -- so compare the high nybble with 8 rather than 9 + -- if the high nybble is 9 there will be an overflow on the high nybble + -- after the decimal adjust which means it will roll over to an invalid BCD digit + -- + if( left(7 downto 4) <= 8 ) then + -- hi <= 8 (overflow in low nybble only) + daa_reg := "00000110"; + else + -- hi > 8 (overflow in low and high nybble) + daa_reg := "01100110"; + end if; + end if; + else + -- HBIT=1 (overflow in low nybble) + if valid_hi then + -- hi <= 9 (overflow in low nybble only) + daa_reg := "00000110"; + else + -- hi > 9 (overflow in low and high nybble) + daa_reg := "01100110"; + end if; + end if; + else + -- CBIT=1 (carry => overflow in high nybble) + if ( cc(HBIT) = '0' )then + -- HBIT=0 (half carry clear => may or may not be an overflow in the low nybble) + if valid_lo then + -- lo <=9 (overflow in high nybble only) + daa_reg := "01100000"; + else + -- lo >9 (overflow in low and high nybble) + daa_reg := "01100110"; + end if; + else + -- HBIT=1 (overflow in low and high nybble) + daa_reg := "01100110"; + end if; + end if; + + case alu_ctrl is + when alu_add8 | alu_inc | + alu_add16 | alu_adc | alu_mul => + out_alu <= left + right + ("000000000000000" & carry_in); + when alu_sub8 | alu_dec | + alu_sub16 | alu_sbc => + out_alu <= left - right - ("000000000000000" & carry_in); + when alu_abx => + out_alu <= left + ("00000000" & right(7 downto 0)) ; + when alu_and => + out_alu <= left and right; -- and/bit + when alu_ora => + out_alu <= left or right; -- or + when alu_eor => + out_alu <= left xor right; -- eor/xor + when alu_lsl16 | alu_asl8 | alu_rol8 => + out_alu <= left(14 downto 0) & carry_in; -- rol8/asl8/lsl16 + when alu_lsr16 => + out_alu <= carry_in & left(15 downto 1); -- lsr16 + when alu_lsr8 | alu_asr8 | alu_ror8 => + out_alu <= "00000000" & carry_in & left(7 downto 1); -- ror8/asr8/lsr8 + when alu_neg => + out_alu <= right - left; -- neg (right=0) + when alu_com => + out_alu <= not left; + when alu_clr | alu_ld8 | alu_ld16 | alu_lea => + out_alu <= right; -- clr, ld + when alu_st8 | alu_st16 | alu_andcc | alu_orcc | alu_tfr => + out_alu <= left; + when alu_daa => + out_alu <= left + ("00000000" & daa_reg); + when alu_sex => + if left(7) = '0' then + out_alu <= "00000000" & left(7 downto 0); + else + out_alu <= "11111111" & left(7 downto 0); + end if; + when others => + out_alu <= left; -- nop + end case; + + -- + -- carry bit + -- + case alu_ctrl is + when alu_add8 | alu_adc => + cc_out(CBIT) <= (left(7) and right(7)) or + (left(7) and not out_alu(7)) or + (right(7) and not out_alu(7)); + when alu_sub8 | alu_sbc => + cc_out(CBIT) <= ((not left(7)) and right(7)) or + ((not left(7)) and out_alu(7)) or + (right(7) and out_alu(7)); + when alu_add16 => + cc_out(CBIT) <= (left(15) and right(15)) or + (left(15) and not out_alu(15)) or + (right(15) and not out_alu(15)); + when alu_sub16 => + cc_out(CBIT) <= ((not left(15)) and right(15)) or + ((not left(15)) and out_alu(15)) or + (right(15) and out_alu(15)); + when alu_ror8 | alu_lsr16 | alu_lsr8 | alu_asr8 => + cc_out(CBIT) <= left(0); + when alu_rol8 | alu_asl8 => + cc_out(CBIT) <= left(7); + when alu_lsl16 => + cc_out(CBIT) <= left(15); + when alu_com => + cc_out(CBIT) <= '1'; + when alu_neg | alu_clr => + cc_out(CBIT) <= out_alu(7) or out_alu(6) or out_alu(5) or out_alu(4) or + out_alu(3) or out_alu(2) or out_alu(1) or out_alu(0); + when alu_mul => + cc_out(CBIT) <= out_alu(7); + when alu_daa => + if ( daa_reg(7 downto 4) = "0110" ) then + cc_out(CBIT) <= '1'; + else + cc_out(CBIT) <= '0'; + end if; + when alu_andcc => + cc_out(CBIT) <= left(CBIT) and cc(CBIT); + when alu_orcc => + cc_out(CBIT) <= left(CBIT) or cc(CBIT); + when alu_tfr => + cc_out(CBIT) <= left(CBIT); + when others => + cc_out(CBIT) <= cc(CBIT); + end case; + -- + -- Zero flag + -- + case alu_ctrl is + when alu_add8 | alu_sub8 | + alu_adc | alu_sbc | + alu_and | alu_ora | alu_eor | + alu_inc | alu_dec | + alu_neg | alu_com | alu_clr | + alu_rol8 | alu_ror8 | alu_asr8 | alu_asl8 | alu_lsr8 | + alu_ld8 | alu_st8 | alu_sex | alu_daa => + cc_out(ZBIT) <= not( out_alu(7) or out_alu(6) or out_alu(5) or out_alu(4) or + out_alu(3) or out_alu(2) or out_alu(1) or out_alu(0) ); + when alu_add16 | alu_sub16 | alu_mul | + alu_lsl16 | alu_lsr16 | + alu_ld16 | alu_st16 | alu_lea => + cc_out(ZBIT) <= not( out_alu(15) or out_alu(14) or out_alu(13) or out_alu(12) or + out_alu(11) or out_alu(10) or out_alu(9) or out_alu(8) or + out_alu(7) or out_alu(6) or out_alu(5) or out_alu(4) or + out_alu(3) or out_alu(2) or out_alu(1) or out_alu(0) ); + when alu_andcc => + cc_out(ZBIT) <= left(ZBIT) and cc(ZBIT); + when alu_orcc => + cc_out(ZBIT) <= left(ZBIT) or cc(ZBIT); + when alu_tfr => + cc_out(ZBIT) <= left(ZBIT); + when others => + cc_out(ZBIT) <= cc(ZBIT); + end case; + + -- + -- negative flag + -- + case alu_ctrl is + when alu_add8 | alu_sub8 | + alu_adc | alu_sbc | + alu_and | alu_ora | alu_eor | + alu_rol8 | alu_ror8 | alu_asr8 | alu_asl8 | alu_lsr8 | + alu_inc | alu_dec | alu_neg | alu_com | alu_clr | + alu_ld8 | alu_st8 | alu_sex | alu_daa => + cc_out(NBIT) <= out_alu(7); + when alu_add16 | alu_sub16 | + alu_lsl16 | alu_lsr16 | + alu_ld16 | alu_st16 => + cc_out(NBIT) <= out_alu(15); + when alu_andcc => + cc_out(NBIT) <= left(NBIT) and cc(NBIT); + when alu_orcc => + cc_out(NBIT) <= left(NBIT) or cc(NBIT); + when alu_tfr => + cc_out(NBIT) <= left(NBIT); + when others => + cc_out(NBIT) <= cc(NBIT); + end case; + + -- + -- Interrupt mask flag + -- + case alu_ctrl is + when alu_andcc => + cc_out(IBIT) <= left(IBIT) and cc(IBIT); + when alu_orcc => + cc_out(IBIT) <= left(IBIT) or cc(IBIT); + when alu_tfr => + cc_out(IBIT) <= left(IBIT); + when alu_seif | alu_sei => + cc_out(IBIT) <= '1'; + when others => + cc_out(IBIT) <= cc(IBIT); -- interrupt mask + end case; + + -- + -- Half Carry flag + -- + case alu_ctrl is + when alu_add8 | alu_adc => + cc_out(HBIT) <= (left(3) and right(3)) or + (right(3) and not out_alu(3)) or + (left(3) and not out_alu(3)); + when alu_andcc => + cc_out(HBIT) <= left(HBIT) and cc(HBIT); + when alu_orcc => + cc_out(HBIT) <= left(HBIT) or cc(HBIT); + when alu_tfr => + cc_out(HBIT) <= left(HBIT); + when others => + cc_out(HBIT) <= cc(HBIT); + end case; + + -- + -- Overflow flag + -- + case alu_ctrl is + when alu_add8 | alu_adc => + cc_out(VBIT) <= (left(7) and right(7) and (not out_alu(7))) or + ((not left(7)) and (not right(7)) and out_alu(7)); + when alu_sub8 | alu_sbc => + cc_out(VBIT) <= (left(7) and (not right(7)) and (not out_alu(7))) or + ((not left(7)) and right(7) and out_alu(7)); + when alu_add16 => + cc_out(VBIT) <= (left(15) and right(15) and (not out_alu(15))) or + ((not left(15)) and (not right(15)) and out_alu(15)); + when alu_sub16 => + cc_out(VBIT) <= (left(15) and (not right(15)) and (not out_alu(15))) or + ((not left(15)) and right(15) and out_alu(15)); + when alu_inc => + cc_out(VBIT) <= ((not left(7)) and left(6) and left(5) and left(4) and + left(3) and left(2) and left(1) and left(0)); + when alu_dec | alu_neg => + cc_out(VBIT) <= (left(7) and (not left(6)) and (not left(5)) and (not left(4)) and + (not left(3)) and (not left(2)) and (not left(1)) and (not left(0))); +-- 6809 Programming reference manual says +-- V not affected by ASR, LSR and ROR +-- This is different to the 6800 +-- John Kent 6th June 2006 +-- when alu_asr8 => +-- cc_out(VBIT) <= left(0) xor left(7); +-- when alu_lsr8 | alu_lsr16 => +-- cc_out(VBIT) <= left(0); +-- when alu_ror8 => +-- cc_out(VBIT) <= left(0) xor cc(CBIT); + when alu_lsl16 => + cc_out(VBIT) <= left(15) xor left(14); + when alu_rol8 | alu_asl8 => + cc_out(VBIT) <= left(7) xor left(6); +-- +-- 11th July 2006 - John Kent +-- What DAA does with V is anyones guess +-- It is undefined in the 6809 programming manual +-- + when alu_daa => + cc_out(VBIT) <= left(7) xor out_alu(7) xor cc(CBIT); +-- CLR resets V Bit +-- John Kent 6th June 2006 + when alu_and | alu_ora | alu_eor | alu_com | alu_clr | + alu_st8 | alu_st16 | alu_ld8 | alu_ld16 | alu_sex => + cc_out(VBIT) <= '0'; + when alu_andcc => + cc_out(VBIT) <= left(VBIT) and cc(VBIT); + when alu_orcc => + cc_out(VBIT) <= left(VBIT) or cc(VBIT); + when alu_tfr => + cc_out(VBIT) <= left(VBIT); + when others => + cc_out(VBIT) <= cc(VBIT); + end case; + + case alu_ctrl is + when alu_andcc => + cc_out(FBIT) <= left(FBIT) and cc(FBIT); + when alu_orcc => + cc_out(FBIT) <= left(FBIT) or cc(FBIT); + when alu_tfr => + cc_out(FBIT) <= left(FBIT); + when alu_seif => + cc_out(FBIT) <= '1'; + when others => + cc_out(FBIT) <= cc(FBIT); + end case; + + case alu_ctrl is + when alu_andcc => + cc_out(EBIT) <= left(EBIT) and cc(EBIT); + when alu_orcc => + cc_out(EBIT) <= left(EBIT) or cc(EBIT); + when alu_tfr => + cc_out(EBIT) <= left(EBIT); + when alu_see => + cc_out(EBIT) <= '1'; + when alu_cle => + cc_out(EBIT) <= '0'; + when others => + cc_out(EBIT) <= cc(EBIT); + end case; +end process; + +------------------------------------ +-- +-- state sequencer +-- +------------------------------------ +process( state, saved_state, + op_code, pre_code, + cc, ea, md, iv, fic, halt, + nmi_req, firq, irq, lic ) +variable cond_true : boolean; -- variable used to evaluate coditional branches +begin + cond_true := (1=1); + ba <= '0'; + bs <= '0'; + lic <= '0'; + opfetch <= '0'; + iv_ctrl <= latch_iv; + -- Registers preserved + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + dp_ctrl <= latch_dp; + ix_ctrl <= latch_ix; + iy_ctrl <= latch_iy; + up_ctrl <= latch_up; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + ea_ctrl <= latch_ea; + op_ctrl <= latch_op; + pre_ctrl <= latch_pre; + -- ALU Idle + left_ctrl <= pc_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + -- Bus idle + addr_ctrl <= idle_ad; + dout_ctrl <= cc_dout; + -- Next State Fetch + st_ctrl <= idle_st; + return_state <= fetch_state; + next_state <= fetch_state; + + case state is + when reset_state => -- released from reset + -- reset the registers + iv_ctrl <= reset_iv; + op_ctrl <= reset_op; + pre_ctrl <= reset_pre; + cc_ctrl <= reset_cc; + acca_ctrl <= reset_acca; + accb_ctrl <= reset_accb; + dp_ctrl <= reset_dp; + ix_ctrl <= reset_ix; + iy_ctrl <= reset_iy; + up_ctrl <= reset_up; + sp_ctrl <= reset_sp; + pc_ctrl <= reset_pc; + ea_ctrl <= reset_ea; + md_ctrl <= reset_md; + st_ctrl <= reset_st; + next_state <= vect_hi_state; + + -- + -- Jump via interrupt vector + -- iv holds interrupt type + -- fetch PC hi from vector location + -- + when vect_hi_state => + -- fetch pc low interrupt vector + pc_ctrl <= pull_hi_pc; + addr_ctrl <= int_hi_ad; + bs <= '1'; + next_state <= vect_lo_state; + + -- + -- jump via interrupt vector + -- iv holds vector type + -- fetch PC lo from vector location + -- + when vect_lo_state => + -- fetch the vector low byte + pc_ctrl <= pull_lo_pc; + addr_ctrl <= int_lo_ad; + bs <= '1'; + next_state <= fetch_state; + + when vect_idle_state => + -- + -- Last Instruction Cycle for SWI, SWI2 & SWI3 + -- + if op_code = "00111111" then + lic <= '1'; + end if; + next_state <= fetch_state; + + -- + -- Here to fetch an instruction + -- PC points to opcode + -- + when fetch_state => + -- fetch the op code + opfetch <= '1'; + op_ctrl <= fetch_op; + pre_ctrl <= fetch_pre; + ea_ctrl <= reset_ea; + -- Fetch op code + addr_ctrl <= fetch_ad; + -- Advance the PC to fetch next instruction byte + pc_ctrl <= incr_pc; + next_state <= decode1_state; + + -- + -- Here to decode instruction + -- and fetch next byte of intruction + -- whether it be necessary or not + -- + when decode1_state => + -- fetch first byte of address or immediate data + ea_ctrl <= fetch_first_ea; + md_ctrl <= fetch_first_md; + addr_ctrl <= fetch_ad; + case op_code(7 downto 4) is + -- + -- direct single op (2 bytes) + -- 6809 => 6 cycles + -- cpu09 => 5 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 ea_hi=dp / ea_lo=(pc) / pc=pc+1 + -- 3 md_lo=(ea) / pc=pc + -- 4 alu_left=md / md=alu_out / pc=pc + -- 5 (ea)=md_lo / pc=pc + -- + -- Exception is JMP + -- 6809 => 3 cycles + -- cpu09 => 3 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 ea_hi=dp / ea_lo=(pc) / pc=pc+1 + -- 3 pc=ea + -- + when "0000" => + -- advance the PC + pc_ctrl <= incr_pc; + + case op_code(3 downto 0) is + when "1110" => -- jmp + next_state <= jmp_state; + + when "1111" => -- clr + next_state <= single_op_exec_state; + + when others => + next_state <= single_op_read_state; + + end case; + + -- acca / accb inherent instructions + when "0001" => + case op_code(3 downto 0) is + -- + -- Page2 pre byte + -- pre=(pc) / pc=pc+1 + -- op=(pc) / pc=pc+1 + -- + when "0000" => -- page2 + opfetch <= '1'; + op_ctrl <= fetch_op; + -- advance pc + pc_ctrl <= incr_pc; + next_state <= decode2_state; + + -- + -- Page3 pre byte + -- pre=(pc) / pc=pc+1 + -- op=(pc) / pc=pc+1 + -- + when "0001" => -- page3 + opfetch <= '1'; + op_ctrl <= fetch_op; + -- advance pc + pc_ctrl <= incr_pc; + next_state <= decode3_state; + + -- + -- nop - No operation ( 1 byte ) + -- 6809 => 2 cycles + -- cpu09 => 2 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 decode + -- + when "0010" => -- nop + lic <= '1'; + next_state <= fetch_state; + + -- + -- sync - halt execution until an interrupt is received + -- interrupt may be NMI, IRQ or FIRQ + -- program execution continues if the + -- interrupt is asserted for 3 clock cycles + -- note that registers are not pushed onto the stack + -- CPU09 => Interrupts need only be asserted for one clock cycle + -- + when "0011" => -- sync + next_state <= sync_state; + + -- + -- lbra -- long branch (3 bytes) + -- 6809 => 5 cycles + -- cpu09 => 4 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 md_hi=sign(pc) / md_lo=(pc) / pc=pc+1 + -- 3 md_hi=md_lo / md_lo=(pc) / pc=pc+1 + -- 4 pc=pc+md + -- + when "0110" => + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= lbranch_state; + + -- + -- lbsr - long branch to subroutine (3 bytes) + -- 6809 => 9 cycles + -- cpu09 => 6 cycles + -- 1 op=(pc) /pc=pc+1 + -- 2 md_hi=sign(pc) / md_lo=(pc) / pc=pc+1 / sp=sp-1 + -- 3 md_hi=md_lo / md_lo=(pc) / pc=pc+1 + -- 4 (sp)= pc_lo / sp=sp-1 / pc=pc + -- 5 (sp)=pc_hi / pc=pc + -- 6 pc=pc+md + -- + when "0111" => + -- pre decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= lbranch_state; + + -- + -- Decimal Adjust Accumulator + -- + when "1001" => -- daa + left_ctrl <= acca_left; + right_ctrl <= accb_right; + alu_ctrl <= alu_daa; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + lic <= '1'; + next_state <= fetch_state; + + -- + -- OR Condition Codes + -- + when "1010" => -- orcc + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= orcc_state; + + -- + -- AND Condition Codes + -- + when "1100" => -- andcc + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= andcc_state; + + -- + -- Sign Extend + -- + when "1101" => -- sex + left_ctrl <= accb_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_sex; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + lic <= '1'; + next_state <= fetch_state; + + -- + -- Exchange Registers + -- + when "1110" => -- exg + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= exg_state; + + -- + -- Transfer Registers + -- + when "1111" => -- tfr + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= tfr_state; + + when others => + -- increment the pc + pc_ctrl <= incr_pc; + lic <= '1'; + next_state <= fetch_state; + end case; + + -- + -- Short branch conditional + -- 6809 => always 3 cycles + -- cpu09 => always = 3 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 md_hi=sign(pc) / md_lo=(pc) / pc=pc+1 / test cc + -- 3 if cc tru pc=pc+md else pc=pc + -- + when "0010" => -- branch conditional + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= sbranch_state; + + -- + -- Single byte stack operators + -- Do not advance PC + -- + when "0011" => + -- + -- lea - load effective address (2+ bytes) + -- 6809 => 4 cycles + addressing mode + -- cpu09 => 4 cycles + addressing mode + -- 1 op=(pc) / pc=pc+1 + -- 2 md_lo=(pc) / pc=pc+1 + -- 3 calculate ea + -- 4 ix/iy/sp/up = ea + -- + case op_code(3 downto 0) is + when "0000" | -- leax + "0001" | -- leay + "0010" | -- leas + "0011" => -- leau + -- advance PC + pc_ctrl <= incr_pc; + st_ctrl <= push_st; + return_state <= lea_state; + next_state <= indexed_state; + + -- + -- pshs - push registers onto sp stack + -- 6809 => 5 cycles + registers + -- cpu09 => 3 cycles + registers + -- 1 op=(pc) / pc=pc+1 + -- 2 ea_lo=(pc) / pc=pc+1 + -- 3 if ea(7 downto 0) != "00000000" then sp=sp-1 + -- 4 if ea(7) = 1 (sp)=pcl, sp=sp-1 + -- 5 if ea(7) = 1 (sp)=pch + -- if ea(6 downto 0) != "0000000" then sp=sp-1 + -- 6 if ea(6) = 1 (sp)=upl, sp=sp-1 + -- 7 if ea(6) = 1 (sp)=uph + -- if ea(5 downto 0) != "000000" then sp=sp-1 + -- 8 if ea(5) = 1 (sp)=iyl, sp=sp-1 + -- 9 if ea(5) = 1 (sp)=iyh + -- if ea(4 downto 0) != "00000" then sp=sp-1 + -- 10 if ea(4) = 1 (sp)=ixl, sp=sp-1 + -- 11 if ea(4) = 1 (sp)=ixh + -- if ea(3 downto 0) != "0000" then sp=sp-1 + -- 12 if ea(3) = 1 (sp)=dp + -- if ea(2 downto 0) != "000" then sp=sp-1 + -- 13 if ea(2) = 1 (sp)=accb + -- if ea(1 downto 0) != "00" then sp=sp-1 + -- 14 if ea(1) = 1 (sp)=acca + -- if ea(0 downto 0) != "0" then sp=sp-1 + -- 15 if ea(0) = 1 (sp)=cc + -- + when "0100" => -- pshs + -- advance PC + pc_ctrl <= incr_pc; + next_state <= pshs_state; + + -- + -- puls - pull registers of sp stack + -- 6809 => 5 cycles + registers + -- cpu09 => 3 cycles + registers + -- + when "0101" => -- puls + -- advance PC + pc_ctrl <= incr_pc; + next_state <= puls_state; + + -- + -- pshu - push registers onto up stack + -- 6809 => 5 cycles + registers + -- cpu09 => 3 cycles + registers + -- + when "0110" => -- pshu + -- advance PC + pc_ctrl <= incr_pc; + next_state <= pshu_state; + + -- + -- pulu - pull registers of up stack + -- 6809 => 5 cycles + registers + -- cpu09 => 3 cycles + registers + -- + when "0111" => -- pulu + -- advance PC + pc_ctrl <= incr_pc; + next_state <= pulu_state; + + -- + -- rts - return from subroutine + -- 6809 => 5 cycles + -- cpu09 => 4 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 decode op + -- 3 pc_hi = (sp) / sp=sp+1 + -- 4 pc_lo = (sp) / sp=sp+1 + -- + when "1001" => + next_state <= pull_return_hi_state; + + -- + -- ADD accb to index register + -- *** Note: this is an unsigned addition. + -- does not affect any condition codes + -- 6809 => 3 cycles + -- cpu09 => 2 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 alu_left=ix / alu_right=accb / ix=alu_out / pc=pc + -- + when "1010" => -- abx + lic <= '1'; + left_ctrl <= ix_left; + right_ctrl <= accb_right; + alu_ctrl <= alu_abx; + ix_ctrl <= load_ix; + next_state <= fetch_state; + + -- + -- Return From Interrupt + -- + when "1011" => -- rti + next_state <= rti_cc_state; + + -- + -- CWAI + -- + when "1100" => -- cwai #$ + -- pre decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- increment pc + pc_ctrl <= incr_pc; + next_state <= cwai_state; + + -- + -- MUL Multiply + -- + when "1101" => -- mul + next_state <= mul_state; + + -- + -- SWI Software Interrupt + -- + when "1111" => -- swi + -- predecrement SP + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + iv_ctrl <= swi_iv; + st_ctrl <= push_st; + return_state <= int_swimask_state; + next_state <= int_entire_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + -- + -- Accumulator A Single operand + -- source = acca, dest = acca + -- Do not advance PC + -- Typically 2 cycles 1 bytes + -- 1 opcode fetch + -- 2 post byte fetch / instruction decode + -- Note that there is no post byte + -- so do not advance PC in decode cycle + -- Re-run opcode fetch cycle after decode + -- + when "0100" => -- acca single op + left_ctrl <= acca_left; + case op_code(3 downto 0) is + + when "0000" => -- neg + right_ctrl <= zero_right; + alu_ctrl <= alu_neg; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "0011" => -- com + right_ctrl <= zero_right; + alu_ctrl <= alu_com; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "0100" => -- lsr + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "0110" => -- ror + right_ctrl <= zero_right; + alu_ctrl <= alu_ror8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "0111" => -- asr + right_ctrl <= zero_right; + alu_ctrl <= alu_asr8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "1000" => -- asl + right_ctrl <= zero_right; + alu_ctrl <= alu_asl8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "1001" => -- rol + right_ctrl <= zero_right; + alu_ctrl <= alu_rol8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "1010" => -- dec + right_ctrl <= one_right; + alu_ctrl <= alu_dec; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "1011" => -- undefined + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + acca_ctrl <= latch_acca; + cc_ctrl <= latch_cc; + + when "1100" => -- inc + right_ctrl <= one_right; + alu_ctrl <= alu_inc; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when "1101" => -- tst + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + acca_ctrl <= latch_acca; + cc_ctrl <= load_cc; + + when "1110" => -- jmp (not defined) + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + acca_ctrl <= latch_acca; + cc_ctrl <= latch_cc; + + when "1111" => -- clr + right_ctrl <= zero_right; + alu_ctrl <= alu_clr; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + + when others => + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + acca_ctrl <= latch_acca; + cc_ctrl <= latch_cc; + + end case; + lic <= '1'; + next_state <= fetch_state; + + -- + -- Single Operand accb + -- source = accb, dest = accb + -- Typically 2 cycles 1 bytes + -- 1 opcode fetch + -- 2 post byte fetch / instruction decode + -- Note that there is no post byte + -- so do not advance PC in decode cycle + -- Re-run opcode fetch cycle after decode + -- + when "0101" => + left_ctrl <= accb_left; + case op_code(3 downto 0) is + when "0000" => -- neg + right_ctrl <= zero_right; + alu_ctrl <= alu_neg; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "0011" => -- com + right_ctrl <= zero_right; + alu_ctrl <= alu_com; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "0100" => -- lsr + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "0110" => -- ror + right_ctrl <= zero_right; + alu_ctrl <= alu_ror8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "0111" => -- asr + right_ctrl <= zero_right; + alu_ctrl <= alu_asr8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "1000" => -- asl + right_ctrl <= zero_right; + alu_ctrl <= alu_asl8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "1001" => -- rol + right_ctrl <= zero_right; + alu_ctrl <= alu_rol8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "1010" => -- dec + right_ctrl <= one_right; + alu_ctrl <= alu_dec; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "1011" => -- undefined + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + accb_ctrl <= latch_accb; + cc_ctrl <= latch_cc; + + when "1100" => -- inc + right_ctrl <= one_right; + alu_ctrl <= alu_inc; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when "1101" => -- tst + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + accb_ctrl <= latch_accb; + cc_ctrl <= load_cc; + + when "1110" => -- jmp (undefined) + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + accb_ctrl <= latch_accb; + cc_ctrl <= latch_cc; + + when "1111" => -- clr + right_ctrl <= zero_right; + alu_ctrl <= alu_clr; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + + when others => + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + accb_ctrl <= latch_accb; + cc_ctrl <= latch_cc; + end case; + lic <= '1'; + next_state <= fetch_state; + + -- + -- Single operand indexed + -- Two byte instruction so advance PC + -- EA should hold index offset + -- + when "0110" => -- indexed single op + -- increment the pc + pc_ctrl <= incr_pc; + st_ctrl <= push_st; + + case op_code(3 downto 0) is + when "1110" => -- jmp + return_state <= jmp_state; + + when "1111" => -- clr + return_state <= single_op_exec_state; + + when others => + return_state <= single_op_read_state; + + end case; + next_state <= indexed_state; + + -- + -- Single operand extended addressing + -- three byte instruction so advance the PC + -- Low order EA holds high order address + -- + when "0111" => -- extended single op + -- increment PC + pc_ctrl <= incr_pc; + st_ctrl <= push_st; + + case op_code(3 downto 0) is + when "1110" => -- jmp + return_state <= jmp_state; + + when "1111" => -- clr + return_state <= single_op_exec_state; + + when others => + return_state <= single_op_read_state; + + end case; + next_state <= extended_state; + + when "1000" => -- acca immediate + -- increment the pc + pc_ctrl <= incr_pc; + + case op_code(3 downto 0) is + when "0011" | -- subd # + "1100" | -- cmpx # + "1110" => -- ldx # + next_state <= imm16_state; + + -- + -- bsr offset - Branch to subroutine (2 bytes) + -- 6809 => 7 cycles + -- cpu09 => 5 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 md_hi=sign(pc) / md_lo=(pc) / sp=sp-1 / pc=pc+1 + -- 3 (sp)=pc_lo / sp=sp-1 + -- 4 (sp)=pc_hi + -- 5 pc=pc+md + -- + when "1101" => -- bsr + -- pre decrement SP + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- + st_ctrl <= push_st; + return_state <= sbranch_state; + next_state <= push_return_lo_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1001" => -- acca direct + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- subd + "1100" | -- cmpx + "1110" => -- ldx + next_state <= dual_op_read16_state; + + when "0111" => -- sta direct + next_state <= dual_op_write8_state; + + -- + -- jsr direct - Jump to subroutine in direct page (2 bytes) + -- 6809 => 7 cycles + -- cpu09 => 5 cycles + -- 1 op=(pc) / pc=pc+1 + -- 2 ea_hi=0 / ea_lo=(pc) / sp=sp-1 / pc=pc+1 + -- 3 (sp)=pc_lo / sp=sp-1 + -- 4 (sp)=pc_hi + -- 5 pc=ea + -- + when "1101" => -- jsr direct + -- pre decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- + st_ctrl <= push_st; + return_state <= jmp_state; + next_state <= push_return_lo_state; + + + when "1111" => -- stx direct + -- idle ALU + left_ctrl <= ix_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + sp_ctrl <= latch_sp; + next_state <= dual_op_write16_state; + + when others => + next_state <= dual_op_read8_state; + + end case; + + when "1010" => -- acca indexed + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- subd + "1100" | -- cmpx + "1110" => -- ldx + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= indexed_state; + + when "0111" => -- staa ,x + st_ctrl <= push_st; + return_state <= dual_op_write8_state; + next_state <= indexed_state; + + when "1101" => -- jsr ,x + -- DO NOT pre decrement SP + st_ctrl <= push_st; + return_state <= jsr_state; + next_state <= indexed_state; + + when "1111" => -- stx ,x + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= indexed_state; + + when others => + st_ctrl <= push_st; + return_state <= dual_op_read8_state; + next_state <= indexed_state; + + end case; + + when "1011" => -- acca extended + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- subd + "1100" | -- cmpx + "1110" => -- ldx + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= extended_state; + + when "0111" => -- staa > + st_ctrl <= push_st; + return_state <= dual_op_write8_state; + next_state <= extended_state; + + when "1101" => -- jsr >extended + -- DO NOT pre decrement sp + st_ctrl <= push_st; + return_state <= jsr_state; + next_state <= extended_state; + + when "1111" => -- stx > + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= extended_state; + + when others => + st_ctrl <= push_st; + return_state <= dual_op_read8_state; + next_state <= extended_state; + + end case; + + when "1100" => -- accb immediate + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- addd # + "1100" | -- ldd # + "1110" => -- ldu # + next_state <= imm16_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1101" => -- accb direct + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- addd + "1100" | -- ldd + "1110" => -- ldu + next_state <= dual_op_read16_state; + + when "0111" => -- stab direct + next_state <= dual_op_write8_state; + + when "1101" => -- std direct + next_state <= dual_op_write16_state; + + when "1111" => -- stu direct + next_state <= dual_op_write16_state; + + when others => + next_state <= dual_op_read8_state; + + end case; + + when "1110" => -- accb indexed + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- addd + "1100" | -- ldd + "1110" => -- ldu + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= indexed_state; + + when "0111" => -- stab indexed + st_ctrl <= push_st; + return_state <= dual_op_write8_state; + next_state <= indexed_state; + + when "1101" => -- std indexed + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= indexed_state; + + when "1111" => -- stu indexed + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= indexed_state; + + when others => + st_ctrl <= push_st; + return_state <= dual_op_read8_state; + next_state <= indexed_state; + + end case; + + when "1111" => -- accb extended + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- addd + "1100" | -- ldd + "1110" => -- ldu + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= extended_state; + + when "0111" => -- stab extended + st_ctrl <= push_st; + return_state <= dual_op_write8_state; + next_state <= extended_state; + + when "1101" => -- std extended + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= extended_state; + + when "1111" => -- stu extended + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= extended_state; + + when others => + st_ctrl <= push_st; + return_state <= dual_op_read8_state; + next_state <= extended_state; + end case; + -- + -- not sure why I need this + -- + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + -- + -- Here to decode prefix 2 instruction + -- and fetch next byte of intruction + -- whether it be necessary or not + -- + when decode2_state => + -- fetch first byte of address or immediate data + ea_ctrl <= fetch_first_ea; + md_ctrl <= fetch_first_md; + addr_ctrl <= fetch_ad; + case op_code(7 downto 4) is + -- + -- lbcc -- long branch conditional + -- 6809 => branch 6 cycles, no branch 5 cycles + -- cpu09 => always 5 cycles + -- 1 pre=(pc) / pc=pc+1 + -- 2 op=(pc) / pc=pc+1 + -- 3 md_hi=sign(pc) / md_lo=(pc) / pc=pc+1 + -- 4 md_hi=md_lo / md_lo=(pc) / pc=pc+1 + -- 5 if cond pc=pc+md else pc=pc + -- + when "0010" => + -- increment the pc + pc_ctrl <= incr_pc; + next_state <= lbranch_state; + + -- + -- Single byte stack operators + -- Do not advance PC + -- + when "0011" => + case op_code(3 downto 0) is + when "1111" => -- swi 2 + -- predecrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + iv_ctrl <= swi2_iv; + st_ctrl <= push_st; + return_state <= vect_hi_state; + next_state <= int_entire_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + when "1000" => -- acca immediate + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpd # + "1100" | -- cmpy # + "1110" => -- ldy # + next_state <= imm16_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1001" => -- acca direct + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpd < + "1100" | -- cmpy < + "1110" => -- ldy < + next_state <= dual_op_read16_state; + + when "1111" => -- sty < + next_state <= dual_op_write16_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1010" => -- acca indexed + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpd ,ind + "1100" | -- cmpy ,ind + "1110" => -- ldy ,ind + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= indexed_state; + + when "1111" => -- sty ,ind + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= indexed_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + when "1011" => -- acca extended + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpd < + "1100" | -- cmpy < + "1110" => -- ldy < + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= extended_state; + + when "1111" => -- sty > + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= extended_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1100" => -- accb immediate + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- undef # + "1100" | -- undef # + "1110" => -- lds # + next_state <= imm16_state; + + when others => + next_state <= fetch_state; + + end case; + + when "1101" => -- accb direct + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- undef < + "1100" | -- undef < + "1110" => -- lds < + next_state <= dual_op_read16_state; + + when "1111" => -- sts < + next_state <= dual_op_write16_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1110" => -- accb indexed + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- undef ,ind + "1100" | -- undef ,ind + "1110" => -- lds ,ind + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= indexed_state; + + when "1111" => -- sts ,ind + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= indexed_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1111" => -- accb extended + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- undef > + "1100" | -- undef > + "1110" => -- lds > + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= extended_state; + + when "1111" => -- sts > + st_ctrl <= push_st; + return_state <= dual_op_write16_state; + next_state <= extended_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + -- + -- Here to decode instruction + -- and fetch next byte of intruction + -- whether it be necessary or not + -- + when decode3_state => + ea_ctrl <= fetch_first_ea; + md_ctrl <= fetch_first_md; + addr_ctrl <= fetch_ad; + dout_ctrl <= md_lo_dout; + case op_code(7 downto 4) is + -- + -- Single byte stack operators + -- Do not advance PC + -- + when "0011" => + case op_code(3 downto 0) is + when "1111" => -- swi3 + -- predecrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + iv_ctrl <= swi3_iv; + st_ctrl <= push_st; + return_state <= vect_hi_state; + next_state <= int_entire_state; + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + when "1000" => -- acca immediate + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpu # + "1100" | -- cmps # + "1110" => -- undef # + next_state <= imm16_state; + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + when "1001" => -- acca direct + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpu < + "1100" | -- cmps < + "1110" => -- undef < + next_state <= dual_op_read16_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1010" => -- acca indexed + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpu ,X + "1100" | -- cmps ,X + "1110" => -- undef ,X + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= indexed_state; + + when others => + lic <= '1'; + next_state <= fetch_state; + + end case; + + when "1011" => -- acca extended + -- increment the pc + pc_ctrl <= incr_pc; + case op_code(3 downto 0) is + when "0011" | -- cmpu > + "1100" | -- cmps > + "1110" => -- undef > + st_ctrl <= push_st; + return_state <= dual_op_read16_state; + next_state <= extended_state; + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + + -- + -- here if ea holds low byte + -- Direct + -- Extended + -- Indexed + -- read memory location + -- + when single_op_read_state => + -- read memory into md + md_ctrl <= fetch_first_md; + addr_ctrl <= read_ad; + dout_ctrl <= md_lo_dout; + next_state <= single_op_exec_state; + + when single_op_exec_state => + case op_code(3 downto 0) is + when "0000" => -- neg + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_neg; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "0011" => -- com + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_com; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "0100" => -- lsr + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "0110" => -- ror + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_ror8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "0111" => -- asr + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_asr8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "1000" => -- asl + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_asl8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "1001" => -- rol + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_rol8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "1010" => -- dec + left_ctrl <= md_left; + right_ctrl <= one_right; + alu_ctrl <= alu_dec; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "1011" => -- undefined + lic <= '1'; + next_state <= fetch_state; + when "1100" => -- inc + left_ctrl <= md_left; + right_ctrl <= one_right; + alu_ctrl <= alu_inc; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when "1101" => -- tst + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + lic <= '1'; + next_state <= fetch_state; + when "1110" => -- jmp + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_ld16; + pc_ctrl <= load_pc; + lic <= '1'; + next_state <= fetch_state; + when "1111" => -- clr + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_clr; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= single_op_write_state; + when others => + lic <= '1'; + next_state <= fetch_state; + end case; + -- + -- single operand 8 bit write + -- Write low 8 bits of ALU output + -- EA holds address + -- MD holds data + -- + when single_op_write_state => + -- write ALU low byte output + addr_ctrl <= write_ad; + dout_ctrl <= md_lo_dout; + lic <= '1'; + next_state <= fetch_state; + + -- + -- here if ea holds address of low byte + -- read memory location + -- + when dual_op_read8_state => + -- read first data byte from ea + md_ctrl <= fetch_first_md; + addr_ctrl <= read_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- Here to read a 16 bit value into MD + -- pointed to by the EA register + -- The first byte is read + -- and the EA is incremented + -- + when dual_op_read16_state => + -- increment the effective address + left_ctrl <= ea_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- read the high byte of the 16 bit data + md_ctrl <= fetch_first_md; + addr_ctrl <= read_ad; + next_state <= dual_op_read16_2_state; + + -- + -- here to read the second byte + -- pointed to by EA into MD + -- + when dual_op_read16_2_state => + -- read the low byte of the 16 bit data + md_ctrl <= fetch_next_md; + addr_ctrl <= read_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- 16 bit Write state + -- EA hold address of memory to write to + -- Advance the effective address in ALU + -- decode op_code to determine which + -- register to write + -- + when dual_op_write16_state => + -- increment the effective address + left_ctrl <= ea_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- write the ALU hi byte at ea + addr_ctrl <= write_ad; + if op_code(6) = '0' then + case op_code(3 downto 0) is + when "1111" => -- stx / sty + case pre_code is + when "00010000" => -- page 2 -- sty + dout_ctrl <= iy_hi_dout; + when others => -- page 1 -- stx + dout_ctrl <= ix_hi_dout; + end case; + when others => + dout_ctrl <= md_hi_dout; + end case; + else + case op_code(3 downto 0) is + when "1101" => -- std + dout_ctrl <= acca_dout; -- acca is high byte of ACCD + when "1111" => -- stu / sts + case pre_code is + when "00010000" => -- page 2 -- sts + dout_ctrl <= sp_hi_dout; + when others => -- page 1 -- stu + dout_ctrl <= up_hi_dout; + end case; + when others => + dout_ctrl <= md_hi_dout; + end case; + end if; + next_state <= dual_op_write8_state; + + -- + -- Dual operand 8 bit write + -- Write 8 bit accumulator + -- or low byte of 16 bit register + -- EA holds address + -- decode opcode to determine + -- which register to apply to the bus + -- Also set the condition codes here + -- + when dual_op_write8_state => + if op_code(6) = '0' then + case op_code(3 downto 0) is + when "0111" => -- sta + dout_ctrl <= acca_dout; + when "1111" => -- stx / sty + case pre_code is + when "00010000" => -- page 2 -- sty + dout_ctrl <= iy_lo_dout; + when others => -- page 1 -- stx + dout_ctrl <= ix_lo_dout; + end case; + when others => + dout_ctrl <= md_lo_dout; + end case; + else + case op_code(3 downto 0) is + when "0111" => -- stb + dout_ctrl <= accb_dout; + when "1101" => -- std + dout_ctrl <= accb_dout; -- accb is low byte of accd + when "1111" => -- stu / sts + case pre_code is + when "00010000" => -- page 2 -- sts + dout_ctrl <= sp_lo_dout; + when others => -- page 1 -- stu + dout_ctrl <= up_lo_dout; + end case; + when others => + dout_ctrl <= md_lo_dout; + end case; + end if; + -- write ALU low byte output + addr_ctrl <= write_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- 16 bit immediate addressing mode + -- + when imm16_state => + -- increment pc + pc_ctrl <= incr_pc; + -- fetch next immediate byte + md_ctrl <= fetch_next_md; + addr_ctrl <= fetch_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- md & ea holds 8 bit index offset + -- calculate the effective memory address + -- using the alu + -- + when indexed_state => + -- + -- decode indexing mode + -- + if md(7) = '0' then + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= md_sign5_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + next_state <= saved_state; + + else + case md(3 downto 0) is + when "0000" => -- ,R+ + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + left_ctrl <= sp_left; + end case; + -- + right_ctrl <= zero_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + next_state <= postincr1_state; + + when "0001" => -- ,R++ + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + next_state <= postincr2_state; + + when "0010" => -- ,-R + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + ix_ctrl <= load_ix; + when "01" => + left_ctrl <= iy_left; + iy_ctrl <= load_iy; + when "10" => + left_ctrl <= up_left; + up_ctrl <= load_up; + when others => + -- when "11" => + left_ctrl <= sp_left; + sp_ctrl <= load_sp; + end case; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + ea_ctrl <= load_ea; + next_state <= saved_state; + + when "0011" => -- ,--R + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + ix_ctrl <= load_ix; + when "01" => + left_ctrl <= iy_left; + iy_ctrl <= load_iy; + when "10" => + left_ctrl <= up_left; + up_ctrl <= load_up; + when others => + -- when "11" => + left_ctrl <= sp_left; + sp_ctrl <= load_sp; + end case; + right_ctrl <= two_right; + alu_ctrl <= alu_sub16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "0100" => -- ,R (zero offset) + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "0101" => -- ACCB,R + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= accb_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "0110" => -- ACCA,R + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= acca_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "0111" => -- undefined + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "1000" => -- offset8,R + md_ctrl <= fetch_first_md; -- pick up 8 bit offset + addr_ctrl <= fetch_ad; + pc_ctrl <= incr_pc; + next_state <= index8_state; + + when "1001" => -- offset16,R + md_ctrl <= fetch_first_md; -- pick up first byte of 16 bit offset + addr_ctrl <= fetch_ad; + pc_ctrl <= incr_pc; + next_state <= index16_state; + + when "1010" => -- undefined + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "1011" => -- ACCD,R + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= accd_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when "1100" => -- offset8,PC + -- fetch 8 bit offset + md_ctrl <= fetch_first_md; + addr_ctrl <= fetch_ad; + pc_ctrl <= incr_pc; + next_state <= pcrel8_state; + + when "1101" => -- offset16,PC + -- fetch offset + md_ctrl <= fetch_first_md; + addr_ctrl <= fetch_ad; + pc_ctrl <= incr_pc; + next_state <= pcrel16_state; + + when "1110" => -- undefined + case md(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + when others => +-- when "1111" => -- [,address] + -- advance PC to pick up address + md_ctrl <= fetch_first_md; + addr_ctrl <= fetch_ad; + pc_ctrl <= incr_pc; + next_state <= indexaddr_state; + end case; + end if; + + -- load index register with ea plus one + when postincr1_state => + left_ctrl <= ea_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + case md(6 downto 5) is + when "00" => + ix_ctrl <= load_ix; + when "01" => + iy_ctrl <= load_iy; + when "10" => + up_ctrl <= load_up; + when others => + -- when "11" => + sp_ctrl <= load_sp; + end case; + -- return to previous state + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + -- load index register with ea plus two + when postincr2_state => + -- increment register by two (address) + left_ctrl <= ea_left; + right_ctrl <= two_right; + alu_ctrl <= alu_add16; + case md(6 downto 5) is + when "00" => + ix_ctrl <= load_ix; + when "01" => + iy_ctrl <= load_iy; + when "10" => + up_ctrl <= load_up; + when others => + -- when "11" => + sp_ctrl <= load_sp; + end case; + -- return to previous state + if md(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + -- + -- ea = index register + md (8 bit signed offset) + -- ea holds post byte + -- + when index8_state => + case ea(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + -- ea = index reg + md + right_ctrl <= md_sign8_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- return to previous state + if ea(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + -- fetch low byte of 16 bit indexed offset + when index16_state => + -- advance pc + pc_ctrl <= incr_pc; + -- fetch low byte + md_ctrl <= fetch_next_md; + addr_ctrl <= fetch_ad; + next_state <= index16_2_state; + + -- ea = index register + md (16 bit offset) + -- ea holds post byte + when index16_2_state => + case ea(6 downto 5) is + when "00" => + left_ctrl <= ix_left; + when "01" => + left_ctrl <= iy_left; + when "10" => + left_ctrl <= up_left; + when others => + -- when "11" => + left_ctrl <= sp_left; + end case; + -- ea = index reg + md + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- return to previous state + if ea(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + -- + -- pc relative with 8 bit signed offest + -- md holds signed offset + -- + when pcrel8_state => + -- ea = pc + signed md + left_ctrl <= pc_left; + right_ctrl <= md_sign8_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- return to previous state + if ea(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + -- pc relative addressing with 16 bit offset + -- pick up the low byte of the offset in md + -- advance the pc + when pcrel16_state => + -- advance pc + pc_ctrl <= incr_pc; + -- fetch low byte + md_ctrl <= fetch_next_md; + addr_ctrl <= fetch_ad; + next_state <= pcrel16_2_state; + + -- pc relative with16 bit signed offest + -- md holds signed offset + when pcrel16_2_state => + -- ea = pc + md + left_ctrl <= pc_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- return to previous state + if ea(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + -- indexed to address + -- pick up the low byte of the address + -- advance the pc + when indexaddr_state => + -- advance pc + pc_ctrl <= incr_pc; + -- fetch low byte + md_ctrl <= fetch_next_md; + addr_ctrl <= fetch_ad; + next_state <= indexaddr2_state; + + -- indexed to absolute address + -- md holds address + -- ea hold indexing mode byte + when indexaddr2_state => + -- ea = md + left_ctrl <= pc_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + ea_ctrl <= load_ea; + -- return to previous state + if ea(4) = '0' then + next_state <= saved_state; + else + next_state <= indirect_state; + end if; + + -- + -- load md with high byte of indirect address + -- pointed to by ea + -- increment ea + -- + when indirect_state => + -- increment ea + left_ctrl <= ea_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + ea_ctrl <= load_ea; + -- fetch high byte + md_ctrl <= fetch_first_md; + addr_ctrl <= read_ad; + next_state <= indirect2_state; + -- + -- load md with low byte of indirect address + -- pointed to by ea + -- ea has previously been incremented + -- + when indirect2_state => + -- fetch high byte + md_ctrl <= fetch_next_md; + addr_ctrl <= read_ad; + dout_ctrl <= md_lo_dout; + next_state <= indirect3_state; + -- + -- complete idirect addressing + -- by loading ea with md + -- + when indirect3_state => + -- load ea with md + left_ctrl <= ea_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + ea_ctrl <= load_ea; + -- return to previous state + next_state <= saved_state; + + -- + -- ea holds the low byte of the absolute address + -- Move ea low byte into ea high byte + -- load new ea low byte to for absolute 16 bit address + -- advance the program counter + -- + when extended_state => -- fetch ea low byte + -- increment pc + pc_ctrl <= incr_pc; + -- fetch next effective address bytes + ea_ctrl <= fetch_next_ea; + addr_ctrl <= fetch_ad; + -- return to previous state + next_state <= saved_state; + + when lea_state => -- here on load effective address + -- load index register with effective address + left_ctrl <= pc_left; + right_ctrl <= ea_right; + alu_ctrl <= alu_lea; + case op_code(3 downto 0) is + when "0000" => -- leax + cc_ctrl <= load_cc; + ix_ctrl <= load_ix; + when "0001" => -- leay + cc_ctrl <= load_cc; + iy_ctrl <= load_iy; + when "0010" => -- leas + sp_ctrl <= load_sp; + when "0011" => -- leau + up_ctrl <= load_up; + when others => + null; + end case; + lic <= '1'; + next_state <= fetch_state; + + -- + -- jump to subroutine + -- sp=sp-1 + -- call push_return_lo_state to save pc + -- return to jmp_state + -- + when jsr_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- call push_return_state + st_ctrl <= push_st; + return_state <= jmp_state; + next_state <= push_return_lo_state; + + -- + -- Load pc with ea + -- (JMP) + -- + when jmp_state => + -- load PC with effective address + left_ctrl <= pc_left; + right_ctrl <= ea_right; + alu_ctrl <= alu_ld16; + pc_ctrl <= load_pc; + lic <= '1'; + next_state <= fetch_state; + + -- + -- long branch or branch to subroutine + -- pick up next md byte + -- md_hi = md_lo + -- md_lo = (pc) + -- pc=pc+1 + -- if a lbsr push return address + -- continue to sbranch_state + -- to evaluate conditional branches + -- + when lbranch_state => + pc_ctrl <= incr_pc; + -- fetch the next byte into md_lo + md_ctrl <= fetch_next_md; + addr_ctrl <= fetch_ad; + -- if lbsr - push return address + -- then continue on to short branch + if op_code = "00010111" then + st_ctrl <= push_st; + return_state <= sbranch_state; + next_state <= push_return_lo_state; + else + next_state <= sbranch_state; + end if; + + -- + -- here to execute conditional branch + -- short conditional branch md = signed 8 bit offset + -- long branch md = 16 bit offset + -- + when sbranch_state => + left_ctrl <= pc_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + -- Test condition for branch + if op_code(7 downto 4) = "0010" then -- conditional branch + case op_code(3 downto 0) is + when "0000" => -- bra + cond_true := (1 = 1); + when "0001" => -- brn + cond_true := (1 = 0); + when "0010" => -- bhi + cond_true := ((cc(CBIT) or cc(ZBIT)) = '0'); + when "0011" => -- bls + cond_true := ((cc(CBIT) or cc(ZBIT)) = '1'); + when "0100" => -- bcc/bhs + cond_true := (cc(CBIT) = '0'); + when "0101" => -- bcs/blo + cond_true := (cc(CBIT) = '1'); + when "0110" => -- bne + cond_true := (cc(ZBIT) = '0'); + when "0111" => -- beq + cond_true := (cc(ZBIT) = '1'); + when "1000" => -- bvc + cond_true := (cc(VBIT) = '0'); + when "1001" => -- bvs + cond_true := (cc(VBIT) = '1'); + when "1010" => -- bpl + cond_true := (cc(NBIT) = '0'); + when "1011" => -- bmi + cond_true := (cc(NBIT) = '1'); + when "1100" => -- bge + cond_true := ((cc(NBIT) xor cc(VBIT)) = '0'); + when "1101" => -- blt + cond_true := ((cc(NBIT) xor cc(VBIT)) = '1'); + when "1110" => -- bgt + cond_true := ((cc(ZBIT) or (cc(NBIT) xor cc(VBIT))) = '0'); + when "1111" => -- ble + cond_true := ((cc(ZBIT) or (cc(NBIT) xor cc(VBIT))) = '1'); + when others => + null; + end case; + end if; + if cond_true then + pc_ctrl <= load_pc; + end if; + lic <= '1'; + next_state <= fetch_state; + + -- + -- push return address onto the S stack + -- + -- (sp) = pc_lo + -- sp = sp - 1 + -- + when push_return_lo_state => + -- decrement the sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write PC low + addr_ctrl <= pushs_ad; + dout_ctrl <= pc_lo_dout; + next_state <= push_return_hi_state; + + -- + -- push program counter hi byte onto the stack + -- (sp) = pc_hi + -- sp = sp + -- return to originating state + -- + when push_return_hi_state => + -- write pc hi bytes + addr_ctrl <= pushs_ad; + dout_ctrl <= pc_hi_dout; + next_state <= saved_state; + + -- + -- RTS pull return address from stack + -- + when pull_return_hi_state => + -- increment the sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read pc hi + pc_ctrl <= pull_hi_pc; + addr_ctrl <= pulls_ad; + next_state <= pull_return_lo_state; + + when pull_return_lo_state => + -- increment the SP + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read pc low + pc_ctrl <= pull_lo_pc; + addr_ctrl <= pulls_ad; + dout_ctrl <= pc_lo_dout; + -- + lic <= '1'; + next_state <= fetch_state; + + when andcc_state => + -- AND CC with md + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_andcc; + cc_ctrl <= load_cc; + -- + lic <= '1'; + next_state <= fetch_state; + + when orcc_state => + -- OR CC with md + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_orcc; + cc_ctrl <= load_cc; + -- + lic <= '1'; + next_state <= fetch_state; + + when tfr_state => + -- select source register + case md(7 downto 4) is + when "0000" => + left_ctrl <= accd_left; + when "0001" => + left_ctrl <= ix_left; + when "0010" => + left_ctrl <= iy_left; + when "0011" => + left_ctrl <= up_left; + when "0100" => + left_ctrl <= sp_left; + when "0101" => + left_ctrl <= pc_left; + when "1000" => + left_ctrl <= acca_left; + when "1001" => + left_ctrl <= accb_left; + when "1010" => + left_ctrl <= cc_left; + when "1011" => + left_ctrl <= dp_left; + when others => + left_ctrl <= md_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_tfr; + -- select destination register + case md(3 downto 0) is + when "0000" => -- accd + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + when "0001" => -- ix + ix_ctrl <= load_ix; + when "0010" => -- iy + iy_ctrl <= load_iy; + when "0011" => -- up + up_ctrl <= load_up; + when "0100" => -- sp + sp_ctrl <= load_sp; + when "0101" => -- pc + pc_ctrl <= load_pc; + when "1000" => -- acca + acca_ctrl <= load_acca; + when "1001" => -- accb + accb_ctrl <= load_accb; + when "1010" => -- cc + cc_ctrl <= load_cc; + when "1011" => --dp + dp_ctrl <= load_dp; + when others => + null; + end case; + -- + lic <= '1'; + next_state <= fetch_state; + + when exg_state => + -- save destination register + case md(3 downto 0) is + when "0000" => + left_ctrl <= accd_left; + when "0001" => + left_ctrl <= ix_left; + when "0010" => + left_ctrl <= iy_left; + when "0011" => + left_ctrl <= up_left; + when "0100" => + left_ctrl <= sp_left; + when "0101" => + left_ctrl <= pc_left; + when "1000" => + left_ctrl <= acca_left; + when "1001" => + left_ctrl <= accb_left; + when "1010" => + left_ctrl <= cc_left; + when "1011" => + left_ctrl <= dp_left; + when others => + left_ctrl <= md_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_tfr; + ea_ctrl <= load_ea; + -- call tranfer microcode + next_state <= exg1_state; + + when exg1_state => + -- select source register + case md(7 downto 4) is + when "0000" => + left_ctrl <= accd_left; + when "0001" => + left_ctrl <= ix_left; + when "0010" => + left_ctrl <= iy_left; + when "0011" => + left_ctrl <= up_left; + when "0100" => + left_ctrl <= sp_left; + when "0101" => + left_ctrl <= pc_left; + when "1000" => + left_ctrl <= acca_left; + when "1001" => + left_ctrl <= accb_left; + when "1010" => + left_ctrl <= cc_left; + when "1011" => + left_ctrl <= dp_left; + when others => + left_ctrl <= md_left; + end case; + right_ctrl <= zero_right; + alu_ctrl <= alu_tfr; + -- select destination register + case md(3 downto 0) is + when "0000" => -- accd + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + when "0001" => -- ix + ix_ctrl <= load_ix; + when "0010" => -- iy + iy_ctrl <= load_iy; + when "0011" => -- up + up_ctrl <= load_up; + when "0100" => -- sp + sp_ctrl <= load_sp; + when "0101" => -- pc + pc_ctrl <= load_pc; + when "1000" => -- acca + acca_ctrl <= load_acca; + when "1001" => -- accb + accb_ctrl <= load_accb; + when "1010" => -- cc + cc_ctrl <= load_cc; + when "1011" => --dp + dp_ctrl <= load_dp; + when others => + null; + end case; + next_state <= exg2_state; + + when exg2_state => + -- restore destination + left_ctrl <= ea_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_tfr; + -- save as source register + case md(7 downto 4) is + when "0000" => -- accd + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + when "0001" => -- ix + ix_ctrl <= load_ix; + when "0010" => -- iy + iy_ctrl <= load_iy; + when "0011" => -- up + up_ctrl <= load_up; + when "0100" => -- sp + sp_ctrl <= load_sp; + when "0101" => -- pc + pc_ctrl <= load_pc; + when "1000" => -- acca + acca_ctrl <= load_acca; + when "1001" => -- accb + accb_ctrl <= load_accb; + when "1010" => -- cc + cc_ctrl <= load_cc; + when "1011" => --dp + dp_ctrl <= load_dp; + when others => + null; + end case; + lic <= '1'; + next_state <= fetch_state; + + when mul_state => + -- move acca to md + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + md_ctrl <= load_md; + next_state <= mulea_state; + + when mulea_state => + -- move accb to ea + left_ctrl <= accb_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + ea_ctrl <= load_ea; + next_state <= muld_state; + + when muld_state => + -- clear accd + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_ld8; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + next_state <= mul0_state; + + when mul0_state => + -- if bit 0 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(0) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul1_state; + + when mul1_state => + -- if bit 1 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(1) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul2_state; + + when mul2_state => + -- if bit 2 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(2) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul3_state; + + when mul3_state => + -- if bit 3 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(3) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul4_state; + + when mul4_state => + -- if bit 4 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(4) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul5_state; + + when mul5_state => + -- if bit 5 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(5) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul6_state; + + when mul6_state => + -- if bit 6 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(6) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + next_state <= mul7_state; + + when mul7_state => + -- if bit 7 of ea set, add accd to md + left_ctrl <= accd_left; + if ea(7) = '1' then + right_ctrl <= md_right; + else + right_ctrl <= zero_right; + end if; + alu_ctrl <= alu_mul; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + md_ctrl <= shiftl_md; + lic <= '1'; + next_state <= fetch_state; + + -- + -- Enter here on pushs + -- ea holds post byte + -- + when pshs_state => + -- decrement sp if any registers to be pushed + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + -- idle address + addr_ctrl <= idle_ad; + dout_ctrl <= cc_dout; + if ea(7 downto 0) = "00000000" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + if ea(7) = '1' then + next_state <= pshs_pcl_state; + elsif ea(6) = '1' then + next_state <= pshs_upl_state; + elsif ea(5) = '1' then + next_state <= pshs_iyl_state; + elsif ea(4) = '1' then + next_state <= pshs_ixl_state; + elsif ea(3) = '1' then + next_state <= pshs_dp_state; + elsif ea(2) = '1' then + next_state <= pshs_accb_state; + elsif ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_pcl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write pc low + addr_ctrl <= pushs_ad; + dout_ctrl <= pc_lo_dout; + next_state <= pshs_pch_state; + + when pshs_pch_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(6 downto 0) = "0000000" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + -- write pc hi + addr_ctrl <= pushs_ad; + dout_ctrl <= pc_hi_dout; + if ea(6) = '1' then + next_state <= pshs_upl_state; + elsif ea(5) = '1' then + next_state <= pshs_iyl_state; + elsif ea(4) = '1' then + next_state <= pshs_ixl_state; + elsif ea(3) = '1' then + next_state <= pshs_dp_state; + elsif ea(2) = '1' then + next_state <= pshs_accb_state; + elsif ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + + when pshs_upl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write pc low + addr_ctrl <= pushs_ad; + dout_ctrl <= up_lo_dout; + next_state <= pshs_uph_state; + + when pshs_uph_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(5 downto 0) = "000000" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + -- write pc hi + addr_ctrl <= pushs_ad; + dout_ctrl <= up_hi_dout; + if ea(5) = '1' then + next_state <= pshs_iyl_state; + elsif ea(4) = '1' then + next_state <= pshs_ixl_state; + elsif ea(3) = '1' then + next_state <= pshs_dp_state; + elsif ea(2) = '1' then + next_state <= pshs_accb_state; + elsif ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_iyl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write iy low + addr_ctrl <= pushs_ad; + dout_ctrl <= iy_lo_dout; + next_state <= pshs_iyh_state; + + when pshs_iyh_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(4 downto 0) = "00000" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + -- write iy hi + addr_ctrl <= pushs_ad; + dout_ctrl <= iy_hi_dout; + if ea(4) = '1' then + next_state <= pshs_ixl_state; + elsif ea(3) = '1' then + next_state <= pshs_dp_state; + elsif ea(2) = '1' then + next_state <= pshs_accb_state; + elsif ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_ixl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write ix low + addr_ctrl <= pushs_ad; + dout_ctrl <= ix_lo_dout; + next_state <= pshs_ixh_state; + + when pshs_ixh_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(3 downto 0) = "0000" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + -- write ix hi + addr_ctrl <= pushs_ad; + dout_ctrl <= ix_hi_dout; + if ea(3) = '1' then + next_state <= pshs_dp_state; + elsif ea(2) = '1' then + next_state <= pshs_accb_state; + elsif ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_dp_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(2 downto 0) = "000" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + -- write dp + addr_ctrl <= pushs_ad; + dout_ctrl <= dp_dout; + if ea(2) = '1' then + next_state <= pshs_accb_state; + elsif ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_accb_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(1 downto 0) = "00" then + sp_ctrl <= latch_sp; + else + sp_ctrl <= load_sp; + end if; + -- write accb + addr_ctrl <= pushs_ad; + dout_ctrl <= accb_dout; + if ea(1) = '1' then + next_state <= pshs_acca_state; + elsif ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_acca_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(0) = '1' then + sp_ctrl <= load_sp; + else + sp_ctrl <= latch_sp; + end if; + -- write acca + addr_ctrl <= pushs_ad; + dout_ctrl <= acca_dout; + if ea(0) = '1' then + next_state <= pshs_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshs_cc_state => + -- idle sp + -- write cc + addr_ctrl <= pushs_ad; + dout_ctrl <= cc_dout; + lic <= '1'; + next_state <= fetch_state; + + -- + -- enter here on PULS + -- ea hold register mask + -- + when puls_state => + if ea(0) = '1' then + next_state <= puls_cc_state; + elsif ea(1) = '1' then + next_state <= puls_acca_state; + elsif ea(2) = '1' then + next_state <= puls_accb_state; + elsif ea(3) = '1' then + next_state <= puls_dp_state; + elsif ea(4) = '1' then + next_state <= puls_ixh_state; + elsif ea(5) = '1' then + next_state <= puls_iyh_state; + elsif ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_cc_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read cc + cc_ctrl <= pull_cc; + addr_ctrl <= pulls_ad; + if ea(1) = '1' then + next_state <= puls_acca_state; + elsif ea(2) = '1' then + next_state <= puls_accb_state; + elsif ea(3) = '1' then + next_state <= puls_dp_state; + elsif ea(4) = '1' then + next_state <= puls_ixh_state; + elsif ea(5) = '1' then + next_state <= puls_iyh_state; + elsif ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_acca_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read acca + acca_ctrl <= pull_acca; + addr_ctrl <= pulls_ad; + if ea(2) = '1' then + next_state <= puls_accb_state; + elsif ea(3) = '1' then + next_state <= puls_dp_state; + elsif ea(4) = '1' then + next_state <= puls_ixh_state; + elsif ea(5) = '1' then + next_state <= puls_iyh_state; + elsif ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_accb_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read accb + accb_ctrl <= pull_accb; + addr_ctrl <= pulls_ad; + if ea(3) = '1' then + next_state <= puls_dp_state; + elsif ea(4) = '1' then + next_state <= puls_ixh_state; + elsif ea(5) = '1' then + next_state <= puls_iyh_state; + elsif ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_dp_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read dp + dp_ctrl <= pull_dp; + addr_ctrl <= pulls_ad; + if ea(4) = '1' then + next_state <= puls_ixh_state; + elsif ea(5) = '1' then + next_state <= puls_iyh_state; + elsif ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_ixh_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- pull ix hi + ix_ctrl <= pull_hi_ix; + addr_ctrl <= pulls_ad; + next_state <= puls_ixl_state; + + when puls_ixl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read ix low + ix_ctrl <= pull_lo_ix; + addr_ctrl <= pulls_ad; + if ea(5) = '1' then + next_state <= puls_iyh_state; + elsif ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_iyh_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- pull iy hi + iy_ctrl <= pull_hi_iy; + addr_ctrl <= pulls_ad; + next_state <= puls_iyl_state; + + when puls_iyl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read iy low + iy_ctrl <= pull_lo_iy; + addr_ctrl <= pulls_ad; + if ea(6) = '1' then + next_state <= puls_uph_state; + elsif ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_uph_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- pull up hi + up_ctrl <= pull_hi_up; + addr_ctrl <= pulls_ad; + next_state <= puls_upl_state; + + when puls_upl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read up low + up_ctrl <= pull_lo_up; + addr_ctrl <= pulls_ad; + if ea(7) = '1' then + next_state <= puls_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when puls_pch_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- pull pc hi + pc_ctrl <= pull_hi_pc; + addr_ctrl <= pulls_ad; + next_state <= puls_pcl_state; + + when puls_pcl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read pc low + pc_ctrl <= pull_lo_pc; + addr_ctrl <= pulls_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- Enter here on pshu + -- ea holds post byte + -- + when pshu_state => + -- decrement up if any registers to be pushed + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(7 downto 0) = "00000000" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write idle bus + if ea(7) = '1' then + next_state <= pshu_pcl_state; + elsif ea(6) = '1' then + next_state <= pshu_spl_state; + elsif ea(5) = '1' then + next_state <= pshu_iyl_state; + elsif ea(4) = '1' then + next_state <= pshu_ixl_state; + elsif ea(3) = '1' then + next_state <= pshu_dp_state; + elsif ea(2) = '1' then + next_state <= pshu_accb_state; + elsif ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + -- + -- push PC onto U stack + -- + when pshu_pcl_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + up_ctrl <= load_up; + -- write pc low + addr_ctrl <= pushu_ad; + dout_ctrl <= pc_lo_dout; + next_state <= pshu_pch_state; + + when pshu_pch_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(6 downto 0) = "0000000" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write pc hi + addr_ctrl <= pushu_ad; + dout_ctrl <= pc_hi_dout; + if ea(6) = '1' then + next_state <= pshu_spl_state; + elsif ea(5) = '1' then + next_state <= pshu_iyl_state; + elsif ea(4) = '1' then + next_state <= pshu_ixl_state; + elsif ea(3) = '1' then + next_state <= pshu_dp_state; + elsif ea(2) = '1' then + next_state <= pshu_accb_state; + elsif ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_spl_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + up_ctrl <= load_up; + -- write sp low + addr_ctrl <= pushu_ad; + dout_ctrl <= sp_lo_dout; + next_state <= pshu_sph_state; + + when pshu_sph_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(5 downto 0) = "000000" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write sp hi + addr_ctrl <= pushu_ad; + dout_ctrl <= sp_hi_dout; + if ea(5) = '1' then + next_state <= pshu_iyl_state; + elsif ea(4) = '1' then + next_state <= pshu_ixl_state; + elsif ea(3) = '1' then + next_state <= pshu_dp_state; + elsif ea(2) = '1' then + next_state <= pshu_accb_state; + elsif ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_iyl_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + up_ctrl <= load_up; + -- write iy low + addr_ctrl <= pushu_ad; + dout_ctrl <= iy_lo_dout; + next_state <= pshu_iyh_state; + + when pshu_iyh_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(4 downto 0) = "00000" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write iy hi + addr_ctrl <= pushu_ad; + dout_ctrl <= iy_hi_dout; + if ea(4) = '1' then + next_state <= pshu_ixl_state; + elsif ea(3) = '1' then + next_state <= pshu_dp_state; + elsif ea(2) = '1' then + next_state <= pshu_accb_state; + elsif ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_ixl_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + up_ctrl <= load_up; + -- write ix low + addr_ctrl <= pushu_ad; + dout_ctrl <= ix_lo_dout; + next_state <= pshu_ixh_state; + + when pshu_ixh_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(3 downto 0) = "0000" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write ix hi + addr_ctrl <= pushu_ad; + dout_ctrl <= ix_hi_dout; + if ea(3) = '1' then + next_state <= pshu_dp_state; + elsif ea(2) = '1' then + next_state <= pshu_accb_state; + elsif ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_dp_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(2 downto 0) = "000" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write dp + addr_ctrl <= pushu_ad; + dout_ctrl <= dp_dout; + if ea(2) = '1' then + next_state <= pshu_accb_state; + elsif ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_accb_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(1 downto 0) = "00" then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write accb + addr_ctrl <= pushu_ad; + dout_ctrl <= accb_dout; + if ea(1) = '1' then + next_state <= pshu_acca_state; + elsif ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_acca_state => + -- decrement up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + if ea(0) = '0' then + up_ctrl <= latch_up; + else + up_ctrl <= load_up; + end if; + -- write acca + addr_ctrl <= pushu_ad; + dout_ctrl <= acca_dout; + if ea(0) = '1' then + next_state <= pshu_cc_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pshu_cc_state => + -- idle up + -- write cc + addr_ctrl <= pushu_ad; + dout_ctrl <= cc_dout; + lic <= '1'; + next_state <= fetch_state; + + -- + -- enter here on PULU + -- ea hold register mask + -- + when pulu_state => + -- idle UP + -- idle bus + if ea(0) = '1' then + next_state <= pulu_cc_state; + elsif ea(1) = '1' then + next_state <= pulu_acca_state; + elsif ea(2) = '1' then + next_state <= pulu_accb_state; + elsif ea(3) = '1' then + next_state <= pulu_dp_state; + elsif ea(4) = '1' then + next_state <= pulu_ixh_state; + elsif ea(5) = '1' then + next_state <= pulu_iyh_state; + elsif ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_cc_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read cc + cc_ctrl <= pull_cc; + addr_ctrl <= pullu_ad; + if ea(1) = '1' then + next_state <= pulu_acca_state; + elsif ea(2) = '1' then + next_state <= pulu_accb_state; + elsif ea(3) = '1' then + next_state <= pulu_dp_state; + elsif ea(4) = '1' then + next_state <= pulu_ixh_state; + elsif ea(5) = '1' then + next_state <= pulu_iyh_state; + elsif ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_acca_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read acca + acca_ctrl <= pull_acca; + addr_ctrl <= pullu_ad; + if ea(2) = '1' then + next_state <= pulu_accb_state; + elsif ea(3) = '1' then + next_state <= pulu_dp_state; + elsif ea(4) = '1' then + next_state <= pulu_ixh_state; + elsif ea(5) = '1' then + next_state <= pulu_iyh_state; + elsif ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_accb_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read accb + accb_ctrl <= pull_accb; + addr_ctrl <= pullu_ad; + if ea(3) = '1' then + next_state <= pulu_dp_state; + elsif ea(4) = '1' then + next_state <= pulu_ixh_state; + elsif ea(5) = '1' then + next_state <= pulu_iyh_state; + elsif ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_dp_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read dp + dp_ctrl <= pull_dp; + addr_ctrl <= pullu_ad; + if ea(4) = '1' then + next_state <= pulu_ixh_state; + elsif ea(5) = '1' then + next_state <= pulu_iyh_state; + elsif ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_ixh_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read ix hi + ix_ctrl <= pull_hi_ix; + addr_ctrl <= pullu_ad; + next_state <= pulu_ixl_state; + + when pulu_ixl_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read ix low + ix_ctrl <= pull_lo_ix; + addr_ctrl <= pullu_ad; + if ea(5) = '1' then + next_state <= pulu_iyh_state; + elsif ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_iyh_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read iy hi + iy_ctrl <= pull_hi_iy; + addr_ctrl <= pullu_ad; + next_state <= pulu_iyl_state; + + when pulu_iyl_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read iy low + iy_ctrl <= pull_lo_iy; + addr_ctrl <= pullu_ad; + if ea(6) = '1' then + next_state <= pulu_sph_state; + elsif ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_sph_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read sp hi + sp_ctrl <= pull_hi_sp; + addr_ctrl <= pullu_ad; + next_state <= pulu_spl_state; + + when pulu_spl_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read sp low + sp_ctrl <= pull_lo_sp; + addr_ctrl <= pullu_ad; + if ea(7) = '1' then + next_state <= pulu_pch_state; + else + lic <= '1'; + next_state <= fetch_state; + end if; + + when pulu_pch_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- pull pc hi + pc_ctrl <= pull_hi_pc; + addr_ctrl <= pullu_ad; + next_state <= pulu_pcl_state; + + when pulu_pcl_state => + -- increment up + left_ctrl <= up_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + up_ctrl <= load_up; + -- read pc low + pc_ctrl <= pull_lo_pc; + addr_ctrl <= pullu_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- pop the Condition codes + -- + when rti_cc_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read cc + cc_ctrl <= pull_cc; + addr_ctrl <= pulls_ad; + next_state <= rti_entire_state; + + -- + -- Added RTI cycle 11th July 2006 John Kent. + -- test the "Entire" Flag + -- that has just been popped off the stack + -- + when rti_entire_state => + -- + -- The Entire flag must be recovered from the stack + -- before testing. + -- + if cc(EBIT) = '1' then + next_state <= rti_acca_state; + else + next_state <= rti_pch_state; + end if; + + when rti_acca_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read acca + acca_ctrl <= pull_acca; + addr_ctrl <= pulls_ad; + next_state <= rti_accb_state; + + when rti_accb_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read accb + accb_ctrl <= pull_accb; + addr_ctrl <= pulls_ad; + next_state <= rti_dp_state; + + when rti_dp_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read dp + dp_ctrl <= pull_dp; + addr_ctrl <= pulls_ad; + next_state <= rti_ixh_state; + + when rti_ixh_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read ix hi + ix_ctrl <= pull_hi_ix; + addr_ctrl <= pulls_ad; + next_state <= rti_ixl_state; + + when rti_ixl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read ix low + ix_ctrl <= pull_lo_ix; + addr_ctrl <= pulls_ad; + next_state <= rti_iyh_state; + + when rti_iyh_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read iy hi + iy_ctrl <= pull_hi_iy; + addr_ctrl <= pulls_ad; + next_state <= rti_iyl_state; + + when rti_iyl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read iy low + iy_ctrl <= pull_lo_iy; + addr_ctrl <= pulls_ad; + next_state <= rti_uph_state; + + + when rti_uph_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read up hi + up_ctrl <= pull_hi_up; + addr_ctrl <= pulls_ad; + next_state <= rti_upl_state; + + when rti_upl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read up low + up_ctrl <= pull_lo_up; + addr_ctrl <= pulls_ad; + next_state <= rti_pch_state; + + when rti_pch_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- pull pc hi + pc_ctrl <= pull_hi_pc; + addr_ctrl <= pulls_ad; + next_state <= rti_pcl_state; + + when rti_pcl_state => + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- pull pc low + pc_ctrl <= pull_lo_pc; + addr_ctrl <= pulls_ad; + lic <= '1'; + next_state <= fetch_state; + + -- + -- here on NMI interrupt + -- Complete execute cycle of the last instruction. + -- If it was a dual operand instruction + -- + when int_nmi_state => + next_state <= int_nmi1_state; + + -- Idle bus cycle + when int_nmi1_state => + -- pre decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + iv_ctrl <= nmi_iv; + st_ctrl <= push_st; + return_state <= int_nmimask_state; + next_state <= int_entire_state; + + -- + -- here on IRQ interrupt + -- Complete execute cycle of the last instruction. + -- If it was a dual operand instruction + -- + when int_irq_state => + next_state <= int_irq1_state; + + -- pre decrement the sp + -- Idle bus cycle + when int_irq1_state => + -- pre decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + iv_ctrl <= irq_iv; + st_ctrl <= push_st; + return_state <= int_irqmask_state; + next_state <= int_entire_state; + + -- + -- here on FIRQ interrupt + -- Complete execution cycle of the last instruction + -- if it was a dual operand instruction + -- + when int_firq_state => + next_state <= int_firq1_state; + + -- Idle bus cycle + when int_firq1_state => + -- pre decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + iv_ctrl <= firq_iv; + st_ctrl <= push_st; + return_state <= int_firqmask_state; + next_state <= int_fast_state; + + -- + -- CWAI entry point + -- stack pointer already pre-decremented + -- mask condition codes + -- + when cwai_state => + -- AND CC with md + left_ctrl <= md_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_andcc; + cc_ctrl <= load_cc; + st_ctrl <= push_st; + return_state <= int_cwai_state; + next_state <= int_entire_state; + + -- + -- wait here for an interrupt + -- + when int_cwai_state => + if (nmi_req = '1') then + iv_ctrl <= nmi_iv; + next_state <= int_nmimask_state; + -- + -- FIRQ & IRQ are level sensitive + -- + elsif (firq = '1') and (cc(FBIT) = '0') then + iv_ctrl <= firq_iv; + next_state <= int_firqmask_state; + + elsif (irq = '1') and (cc(IBIT) = '0') then + iv_ctrl <= irq_iv; + next_state <= int_irqmask_state; + else + next_state <= int_cwai_state; + end if; + + -- + -- State to mask I Flag and F Flag (NMI) + -- + when int_nmimask_state => + alu_ctrl <= alu_seif; + cc_ctrl <= load_cc; + next_state <= vect_hi_state; + + -- + -- State to mask I Flag and F Flag (FIRQ) + -- + when int_firqmask_state => + alu_ctrl <= alu_seif; + cc_ctrl <= load_cc; + next_state <= vect_hi_state; + + + -- + -- State to mask I Flag and F Flag (SWI) + -- + when int_swimask_state => + alu_ctrl <= alu_seif; + cc_ctrl <= load_cc; + next_state <= vect_hi_state; + + -- + -- State to mask I Flag only (IRQ) + -- + when int_irqmask_state => + alu_ctrl <= alu_sei; + cc_ctrl <= load_cc; + next_state <= vect_hi_state; + + -- + -- set Entire Flag on SWI, SWI2, SWI3 and CWAI, IRQ and NMI + -- before stacking all registers + -- + when int_entire_state => + -- set entire flag + alu_ctrl <= alu_see; + cc_ctrl <= load_cc; + next_state <= int_pcl_state; + + -- + -- clear Entire Flag on FIRQ + -- before stacking all registers + -- + when int_fast_state => + -- clear entire flag + alu_ctrl <= alu_cle; + cc_ctrl <= load_cc; + next_state <= int_pcl_state; + + when int_pcl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write pc low + addr_ctrl <= pushs_ad; + dout_ctrl <= pc_lo_dout; + next_state <= int_pch_state; + + when int_pch_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write pc hi + addr_ctrl <= pushs_ad; + dout_ctrl <= pc_hi_dout; + if cc(EBIT) = '1' then + next_state <= int_upl_state; + else + next_state <= int_cc_state; + end if; + + when int_upl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write up low + addr_ctrl <= pushs_ad; + dout_ctrl <= up_lo_dout; + next_state <= int_uph_state; + + when int_uph_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write ix hi + addr_ctrl <= pushs_ad; + dout_ctrl <= up_hi_dout; + next_state <= int_iyl_state; + + when int_iyl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write ix low + addr_ctrl <= pushs_ad; + dout_ctrl <= iy_lo_dout; + next_state <= int_iyh_state; + + when int_iyh_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write ix hi + addr_ctrl <= pushs_ad; + dout_ctrl <= iy_hi_dout; + next_state <= int_ixl_state; + + when int_ixl_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write ix low + addr_ctrl <= pushs_ad; + dout_ctrl <= ix_lo_dout; + next_state <= int_ixh_state; + + when int_ixh_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write ix hi + addr_ctrl <= pushs_ad; + dout_ctrl <= ix_hi_dout; + next_state <= int_dp_state; + + when int_dp_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write accb + addr_ctrl <= pushs_ad; + dout_ctrl <= dp_dout; + next_state <= int_accb_state; + + when int_accb_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write accb + addr_ctrl <= pushs_ad; + dout_ctrl <= accb_dout; + next_state <= int_acca_state; + + when int_acca_state => + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= one_right; + alu_ctrl <= alu_sub16; + sp_ctrl <= load_sp; + -- write acca + addr_ctrl <= pushs_ad; + dout_ctrl <= acca_dout; + next_state <= int_cc_state; + + when int_cc_state => + -- write cc + addr_ctrl <= pushs_ad; + dout_ctrl <= cc_dout; + next_state <= saved_state; + + -- + -- According to the 6809 programming manual: + -- If an interrupt is received and is masked + -- or lasts for less than three cycles, the PC + -- will advance to the next instruction. + -- If an interrupt is unmasked and lasts + -- for more than three cycles, an interrupt + -- will be generated. + -- Note that I don't wait 3 clock cycles. + -- John Kent 11th July 2006 + -- + when sync_state => + lic <= '1'; + ba <= '1'; + -- + -- Version 1.28 2015-05-30 + -- Exit sync_state on interrupt. + -- If the interrupts are active + -- they will be caught in the state_machine process + -- and the interrupt service routine microcode will be executed. + -- Masked interrupts will exit the sync_state. + -- Moved from the state_machine process to the state_sequencer process + -- + if (firq = '1') or (irq = '1') then + next_state <= fetch_state; + else + next_state <= sync_state; + end if; + + when halt_state => + -- + -- 2011-10-30 John Kent + -- ba & bs should be high + ba <= '1'; + bs <= '1'; + if halt = '1' then + next_state <= halt_state; + else + next_state <= fetch_state; + end if; + + end case; + +-- +-- Ver 1.23 2011-10-30 John Kent +-- First instruction cycle might be +-- fetch_state +-- halt_state +-- int_nmirq_state +-- int_firq_state +-- + if fic = '1' then + -- + case op_code(7 downto 6) is + when "10" => -- acca + case op_code(3 downto 0) is + when "0000" => -- suba + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "0001" => -- cmpa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + when "0010" => -- sbca + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sbc; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "0011" => + case pre_code is + when "00010000" => -- page 2 -- cmpd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + when "00010001" => -- page 3 -- cmpu + left_ctrl <= up_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + when others => -- page 1 -- subd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + end case; + when "0100" => -- anda + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "0101" => -- bita + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + when "0110" => -- ldaa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "0111" => -- staa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + when "1000" => -- eora + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_eor; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "1001" => -- adca + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_adc; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "1010" => -- oraa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ora; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "1011" => -- adda + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + when "1100" => + case pre_code is + when "00010000" => -- page 2 -- cmpy + left_ctrl <= iy_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + when "00010001" => -- page 3 -- cmps + left_ctrl <= sp_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + when others => -- page 1 -- cmpx + left_ctrl <= ix_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + end case; + when "1101" => -- bsr / jsr + null; + when "1110" => -- ldx + case pre_code is + when "00010000" => -- page 2 -- ldy + left_ctrl <= iy_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + iy_ctrl <= load_iy; + when others => -- page 1 -- ldx + left_ctrl <= ix_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + ix_ctrl <= load_ix; + end case; + when "1111" => -- stx + case pre_code is + when "00010000" => -- page 2 -- sty + left_ctrl <= iy_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + when others => -- page 1 -- stx + left_ctrl <= ix_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + end case; + when others => + null; + end case; + when "11" => -- accb dual op + case op_code(3 downto 0) is + when "0000" => -- subb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "0001" => -- cmpb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + when "0010" => -- sbcb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sbc; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "0011" => -- addd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + when "0100" => -- andb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "0101" => -- bitb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + when "0110" => -- ldab + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld8; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "0111" => -- stab + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + when "1000" => -- eorb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_eor; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "1001" => -- adcb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_adc; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "1010" => -- orab + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ora; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "1011" => -- addb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add8; + cc_ctrl <= load_cc; + accb_ctrl <= load_accb; + when "1100" => -- ldd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + when "1101" => -- std + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + when "1110" => -- ldu + case pre_code is + when "00010000" => -- page 2 -- lds + left_ctrl <= sp_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + sp_ctrl <= load_sp; + when others => -- page 1 -- ldu + left_ctrl <= up_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + up_ctrl <= load_up; + end case; + when "1111" => + case pre_code is + when "00010000" => -- page 2 -- sts + left_ctrl <= sp_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + when others => -- page 1 -- stu + left_ctrl <= up_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + end case; + when others => + null; + end case; + when others => + null; + end case; + + end if; -- first instruction cycle (fic) + lic_out <= lic; +end process; + +end rtl; + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/cpu68.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/cpu68.vhd new file mode 100644 index 00000000..016bd9a9 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/cpu68.vhd @@ -0,0 +1,3963 @@ +--===========================================================================-- +-- +-- S Y N T H E Z I A B L E CPU68 C O R E +-- +-- www.OpenCores.Org - December 2002 +-- This core adheres to the GNU public license +-- +-- File name : cpu68.vhd +-- +-- Purpose : Implements a 6800 compatible CPU core with some +-- additional instructions found in the 6801 +-- +-- Dependencies : ieee.Std_Logic_1164 +-- ieee.std_logic_unsigned +-- +-- Author : John E. Kent +-- +--===========================================================================---- +-- +-- Revision History: +-- +-- Date: Revision Author +-- 22 Sep 2002 0.1 John Kent +-- +-- 30 Oct 2002 0.2 John Kent +-- made NMI edge triggered +-- +-- 30 Oct 2002 0.3 John Kent +-- more corrections to NMI +-- added wai_wait_state to prevent stack overflow on wai. +-- +-- 1 Nov 2002 0.4 John Kent +-- removed WAI states and integrated WAI with the interrupt service routine +-- replace Data out (do) and Data in (di) register with a single Memory Data (md) reg. +-- Added Multiply instruction states. +-- run ALU and CC out of CPU module for timing measurements. +-- +-- 3 Nov 2002 0.5 John Kent +-- Memory Data Register was not loaded on Store instructions +-- SEV and CLV were not defined in the ALU +-- Overflow Flag on NEG was incorrect +-- +-- 16th Feb 2003 0.6 John Kent +-- Rearranged the execution cycle for dual operand instructions +-- so that occurs during the following fetch cycle. +-- This allows the reduction of one clock cycle from dual operand +-- instruction. Note that this also necessitated re-arranging the +-- program counter so that it is no longer incremented in the ALU. +-- The effective address has also been re-arranged to include a +-- separate added. The STD (store accd) now sets the condition codes. +-- +-- 28th Jun 2003 0.7 John Kent +-- Added Hold and Halt signals. Hold is used to steal cycles from the +-- CPU or add wait states. Halt puts the CPU in the inactive state +-- and is only honoured in the fetch cycle. Both signals are active high. +-- +-- 9th Jan 2004 0.8 John Kent +-- Clear instruction did an alu_ld8 rather than an alu_clr, so +-- the carry bit was not cleared correctly. +-- This error was picked up by Michael Hassenfratz. +-- + +library ieee; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.STD_LOGIC_ARITH.ALL; +use IEEE.STD_LOGIC_UNSIGNED.ALL; + +entity cpu68 is + port ( + clk: in std_logic; + rst: in std_logic; + rw: out std_logic; + vma: out std_logic; + address: out std_logic_vector(15 downto 0); + data_in: in std_logic_vector(7 downto 0); + data_out: out std_logic_vector(7 downto 0); + hold: in std_logic; + halt: in std_logic; + irq: in std_logic; + nmi: in std_logic; + test_alu: out std_logic_vector(15 downto 0); + test_cc: out std_logic_vector(7 downto 0) + ); +end; + +architecture CPU_ARCH of cpu68 is + + constant SBIT : integer := 7; + constant XBIT : integer := 6; + constant HBIT : integer := 5; + constant IBIT : integer := 4; + constant NBIT : integer := 3; + constant ZBIT : integer := 2; + constant VBIT : integer := 1; + constant CBIT : integer := 0; + + type state_type is (reset_state, fetch_state, decode_state, + extended_state, indexed_state, read8_state, read16_state, immediate16_state, + write8_state, write16_state, + execute_state, halt_state, error_state, + mul_state, mulea_state, muld_state, + mul0_state, mul1_state, mul2_state, mul3_state, + mul4_state, mul5_state, mul6_state, mul7_state, + jmp_state, jsr_state, jsr1_state, + branch_state, bsr_state, bsr1_state, + rts_hi_state, rts_lo_state, + int_pcl_state, int_pch_state, + int_ixl_state, int_ixh_state, + int_cc_state, int_acca_state, int_accb_state, + int_wai_state, int_mask_state, + rti_state, rti_cc_state, rti_acca_state, rti_accb_state, + rti_ixl_state, rti_ixh_state, + rti_pcl_state, rti_pch_state, + pula_state, psha_state, pulb_state, pshb_state, + pulx_lo_state, pulx_hi_state, pshx_lo_state, pshx_hi_state, + vect_lo_state, vect_hi_state ); + type addr_type is (idle_ad, fetch_ad, read_ad, write_ad, push_ad, pull_ad, int_hi_ad, int_lo_ad ); + type dout_type is (md_lo_dout, md_hi_dout, acca_dout, accb_dout, ix_lo_dout, ix_hi_dout, cc_dout, pc_lo_dout, pc_hi_dout ); + type op_type is (reset_op, fetch_op, latch_op ); + type acca_type is (reset_acca, load_acca, load_hi_acca, pull_acca, latch_acca ); + type accb_type is (reset_accb, load_accb, pull_accb, latch_accb ); + type cc_type is (reset_cc, load_cc, pull_cc, latch_cc ); + type ix_type is (reset_ix, load_ix, pull_lo_ix, pull_hi_ix, latch_ix ); + type sp_type is (reset_sp, latch_sp, load_sp ); + type pc_type is (reset_pc, latch_pc, load_ea_pc, add_ea_pc, pull_lo_pc, pull_hi_pc, inc_pc ); + type md_type is (reset_md, latch_md, load_md, fetch_first_md, fetch_next_md, shiftl_md ); + type ea_type is (reset_ea, latch_ea, add_ix_ea, load_accb_ea, inc_ea, fetch_first_ea, fetch_next_ea ); + type iv_type is (reset_iv, latch_iv, swi_iv, nmi_iv, irq_iv ); + type nmi_type is (reset_nmi, set_nmi, latch_nmi ); + type left_type is (acca_left, accb_left, accd_left, md_left, ix_left, sp_left ); + type right_type is (md_right, zero_right, plus_one_right, accb_right ); + type alu_type is (alu_add8, alu_sub8, alu_add16, alu_sub16, alu_adc, alu_sbc, + alu_and, alu_ora, alu_eor, + alu_tst, alu_inc, alu_dec, alu_clr, alu_neg, alu_com, + alu_inx, alu_dex, alu_cpx, + alu_lsr16, alu_lsl16, + alu_ror8, alu_rol8, + alu_asr8, alu_asl8, alu_lsr8, + alu_sei, alu_cli, alu_sec, alu_clc, alu_sev, alu_clv, alu_tpa, alu_tap, + alu_ld8, alu_st8, alu_ld16, alu_st16, alu_nop, alu_daa ); + + signal op_code: std_logic_vector(7 downto 0); + signal acca: std_logic_vector(7 downto 0); + signal accb: std_logic_vector(7 downto 0); + signal cc: std_logic_vector(7 downto 0); + signal cc_out: std_logic_vector(7 downto 0); + signal xreg: std_logic_vector(15 downto 0); + signal sp: std_logic_vector(15 downto 0); + signal ea: std_logic_vector(15 downto 0); + signal pc: std_logic_vector(15 downto 0); + signal md: std_logic_vector(15 downto 0); + signal left: std_logic_vector(15 downto 0); + signal right: std_logic_vector(15 downto 0); + signal out_alu: std_logic_vector(15 downto 0); + signal iv: std_logic_vector(1 downto 0); + signal nmi_req: std_logic; + signal nmi_ack: std_logic; + + signal state: state_type; + signal next_state: state_type; + signal pc_ctrl: pc_type; + signal ea_ctrl: ea_type; + signal op_ctrl: op_type; + signal md_ctrl: md_type; + signal acca_ctrl: acca_type; + signal accb_ctrl: accb_type; + signal ix_ctrl: ix_type; + signal cc_ctrl: cc_type; + signal sp_ctrl: sp_type; + signal iv_ctrl: iv_type; + signal left_ctrl: left_type; + signal right_ctrl: right_type; + signal alu_ctrl: alu_type; + signal addr_ctrl: addr_type; + signal dout_ctrl: dout_type; + signal nmi_ctrl: nmi_type; + + +begin + +---------------------------------- +-- +-- Address bus multiplexer +-- +---------------------------------- + +addr_mux: process( clk, addr_ctrl, pc, ea, sp, iv ) +begin + case addr_ctrl is + when idle_ad => + address <= "1111111111111111"; + vma <= '0'; + rw <= '1'; + when fetch_ad => + address <= pc; + vma <= '1'; + rw <= '1'; + when read_ad => + address <= ea; + vma <= '1'; + rw <= '1'; + when write_ad => + address <= ea; + vma <= '1'; + rw <= '0'; + when push_ad => + address <= sp; + vma <= '1'; + rw <= '0'; + when pull_ad => + address <= sp; + vma <= '1'; + rw <= '1'; + when int_hi_ad => + address <= "1111111111111" & iv & "0"; + vma <= '1'; + rw <= '1'; + when int_lo_ad => + address <= "1111111111111" & iv & "1"; + vma <= '1'; + rw <= '1'; + when others => + address <= "1111111111111111"; + vma <= '0'; + rw <= '1'; + end case; +end process; + +-------------------------------- +-- +-- Data Bus output +-- +-------------------------------- +dout_mux : process( clk, dout_ctrl, md, acca, accb, xreg, pc, cc ) +begin + case dout_ctrl is + when md_hi_dout => -- alu output + data_out <= md(15 downto 8); + when md_lo_dout => + data_out <= md(7 downto 0); + when acca_dout => -- accumulator a + data_out <= acca; + when accb_dout => -- accumulator b + data_out <= accb; + when ix_lo_dout => -- index reg + data_out <= xreg(7 downto 0); + when ix_hi_dout => -- index reg + data_out <= xreg(15 downto 8); + when cc_dout => -- condition codes + data_out <= cc; + when pc_lo_dout => -- low order pc + data_out <= pc(7 downto 0); + when pc_hi_dout => -- high order pc + data_out <= pc(15 downto 8); + when others => + data_out <= "00000000"; + end case; +end process; + + +---------------------------------- +-- +-- Program Counter Control +-- +---------------------------------- + +pc_mux: process( clk, pc_ctrl, pc, out_alu, data_in, ea, hold ) +variable tempof : std_logic_vector(15 downto 0); +variable temppc : std_logic_vector(15 downto 0); +begin + case pc_ctrl is + when add_ea_pc => + if ea(7) = '0' then + tempof := "00000000" & ea(7 downto 0); + else + tempof := "11111111" & ea(7 downto 0); + end if; + when inc_pc => + tempof := "0000000000000001"; + when others => + tempof := "0000000000000000"; + end case; + + case pc_ctrl is + when reset_pc => + temppc := "1111111111111110"; + when load_ea_pc => + temppc := ea; + when pull_lo_pc => + temppc(7 downto 0) := data_in; + temppc(15 downto 8) := pc(15 downto 8); + when pull_hi_pc => + temppc(7 downto 0) := pc(7 downto 0); + temppc(15 downto 8) := data_in; + when others => + temppc := pc; + end case; + + if clk'event and clk = '0' then + if hold = '1' then + pc <= pc; + else + pc <= temppc + tempof; + end if; + end if; +end process; + +---------------------------------- +-- +-- Effective Address Control +-- +---------------------------------- + +ea_mux: process( clk, ea_ctrl, ea, out_alu, data_in, accb, xreg, hold ) +variable tempind : std_logic_vector(15 downto 0); +variable tempea : std_logic_vector(15 downto 0); +begin + case ea_ctrl is + when add_ix_ea => + tempind := "00000000" & ea(7 downto 0); + when inc_ea => + tempind := "0000000000000001"; + when others => + tempind := "0000000000000000"; + end case; + + case ea_ctrl is + when reset_ea => + tempea := "0000000000000000"; + when load_accb_ea => + tempea := "00000000" & accb(7 downto 0); + when add_ix_ea => + tempea := xreg; + when fetch_first_ea => + tempea(7 downto 0) := data_in; + tempea(15 downto 8) := "00000000"; + when fetch_next_ea => + tempea(7 downto 0) := data_in; + tempea(15 downto 8) := ea(7 downto 0); + when others => + tempea := ea; + end case; + + if clk'event and clk = '0' then + if hold = '1' then + ea <= ea; + else + ea <= tempea + tempind; + end if; + end if; +end process; + +-------------------------------- +-- +-- Accumulator A +-- +-------------------------------- +acca_mux : process( clk, acca_ctrl, out_alu, acca, data_in, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + acca <= acca; + else + case acca_ctrl is + when reset_acca => + acca <= "00000000"; + when load_acca => + acca <= out_alu(7 downto 0); + when load_hi_acca => + acca <= out_alu(15 downto 8); + when pull_acca => + acca <= data_in; + when others => +-- when latch_acca => + acca <= acca; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- Accumulator B +-- +-------------------------------- +accb_mux : process( clk, accb_ctrl, out_alu, accb, data_in, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + accb <= accb; + else + case accb_ctrl is + when reset_accb => + accb <= "00000000"; + when load_accb => + accb <= out_alu(7 downto 0); + when pull_accb => + accb <= data_in; + when others => +-- when latch_accb => + accb <= accb; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- X Index register +-- +-------------------------------- +ix_mux : process( clk, ix_ctrl, out_alu, xreg, data_in, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + xreg <= xreg; + else + case ix_ctrl is + when reset_ix => + xreg <= "0000000000000000"; + when load_ix => + xreg <= out_alu(15 downto 0); + when pull_hi_ix => + xreg(15 downto 8) <= data_in; + when pull_lo_ix => + xreg(7 downto 0) <= data_in; + when others => +-- when latch_ix => + xreg <= xreg; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- stack pointer +-- +-------------------------------- +sp_mux : process( clk, sp_ctrl, out_alu, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + sp <= sp; + else + case sp_ctrl is + when reset_sp => + sp <= "0000000000000000"; + when load_sp => + sp <= out_alu(15 downto 0); + when others => +-- when latch_sp => + sp <= sp; + end case; + end if; + end if; +end process; + +-------------------------------- +-- +-- Memory Data +-- +-------------------------------- +md_mux : process( clk, md_ctrl, out_alu, data_in, md, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + md <= md; + else + case md_ctrl is + when reset_md => + md <= "0000000000000000"; + when load_md => + md <= out_alu(15 downto 0); + when fetch_first_md => + md(15 downto 8) <= "00000000"; + md(7 downto 0) <= data_in; + when fetch_next_md => + md(15 downto 8) <= md(7 downto 0); + md(7 downto 0) <= data_in; + when shiftl_md => + md(15 downto 1) <= md(14 downto 0); + md(0) <= '0'; + when others => +-- when latch_md => + md <= md; + end case; + end if; + end if; +end process; + + +---------------------------------- +-- +-- Condition Codes +-- +---------------------------------- + +cc_mux: process( clk, cc_ctrl, cc_out, cc, data_in, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + cc <= cc; + else + case cc_ctrl is + when reset_cc => + cc <= "11000000"; + when load_cc => + cc <= cc_out; + when pull_cc => + cc <= data_in; + when others => +-- when latch_cc => + cc <= cc; + end case; + end if; + end if; +end process; + +---------------------------------- +-- +-- interrupt vector +-- +---------------------------------- + +iv_mux: process( clk, iv_ctrl, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + iv <= iv; + else + case iv_ctrl is + when reset_iv => + iv <= "11"; + when nmi_iv => + iv <= "10"; + when swi_iv => + iv <= "01"; + when irq_iv => + iv <= "00"; + when others => + iv <= iv; + end case; + end if; + end if; +end process; + +---------------------------------- +-- +-- op code fetch +-- +---------------------------------- + +op_fetch: process( clk, data_in, op_ctrl, op_code, hold ) +begin + if clk'event and clk = '0' then + if hold = '1' then + op_code <= op_code; + else + case op_ctrl is + when reset_op => + op_code <= "00000001"; -- nop + when fetch_op => + op_code <= data_in; + when others => +-- when latch_op => + op_code <= op_code; + end case; + end if; + end if; +end process; + +---------------------------------- +-- +-- Left Mux +-- +---------------------------------- + +left_mux: process( left_ctrl, acca, accb, xreg, sp, pc, ea, md ) +begin + case left_ctrl is + when acca_left => + left(15 downto 8) <= "00000000"; + left(7 downto 0) <= acca; + when accb_left => + left(15 downto 8) <= "00000000"; + left(7 downto 0) <= accb; + when accd_left => + left(15 downto 8) <= acca; + left(7 downto 0) <= accb; + when ix_left => + left <= xreg; + when sp_left => + left <= sp; + when others => +-- when md_left => + left <= md; + end case; +end process; +---------------------------------- +-- +-- Right Mux +-- +---------------------------------- + +right_mux: process( right_ctrl, data_in, md, accb, ea ) +begin + case right_ctrl is + when zero_right => + right <= "0000000000000000"; + when plus_one_right => + right <= "0000000000000001"; + when accb_right => + right <= "00000000" & accb; + when others => +-- when md_right => + right <= md; + end case; +end process; + +---------------------------------- +-- +-- Arithmetic Logic Unit +-- +---------------------------------- + +mux_alu: process( alu_ctrl, cc, left, right, out_alu, cc_out ) +variable valid_lo, valid_hi : boolean; +variable carry_in : std_logic; +variable daa_reg : std_logic_vector(7 downto 0); +begin + + case alu_ctrl is + when alu_adc | alu_sbc | + alu_rol8 | alu_ror8 => + carry_in := cc(CBIT); + when others => + carry_in := '0'; + end case; + + valid_lo := left(3 downto 0) <= 9; + valid_hi := left(7 downto 4) <= 9; + + if (cc(CBIT) = '0') then + if( cc(HBIT) = '1' ) then + if valid_hi then + daa_reg := "00000110"; + else + daa_reg := "01100110"; + end if; + else + if valid_lo then + if valid_hi then + daa_reg := "00000000"; + else + daa_reg := "01100000"; + end if; + else + if( left(7 downto 4) <= 8 ) then + daa_reg := "00000110"; + else + daa_reg := "01100110"; + end if; + end if; + end if; + else + if ( cc(HBIT) = '1' )then + daa_reg := "01100110"; + else + if valid_lo then + daa_reg := "01100000"; + else + daa_reg := "01100110"; + end if; + end if; + end if; + + case alu_ctrl is + when alu_add8 | alu_inc | + alu_add16 | alu_inx | + alu_adc => + out_alu <= left + right + ("000000000000000" & carry_in); + when alu_sub8 | alu_dec | + alu_sub16 | alu_dex | + alu_sbc | alu_cpx => + out_alu <= left - right - ("000000000000000" & carry_in); + when alu_and => + out_alu <= left and right; -- and/bit + when alu_ora => + out_alu <= left or right; -- or + when alu_eor => + out_alu <= left xor right; -- eor/xor + when alu_lsl16 | alu_asl8 | alu_rol8 => + out_alu <= left(14 downto 0) & carry_in; -- rol8/asl8/lsl16 + when alu_lsr16 | alu_lsr8 => + out_alu <= carry_in & left(15 downto 1); -- lsr + when alu_ror8 => + out_alu <= "00000000" & carry_in & left(7 downto 1); -- ror + when alu_asr8 => + out_alu <= "00000000" & left(7) & left(7 downto 1); -- asr + when alu_neg => + out_alu <= right - left; -- neg (right=0) + when alu_com => + out_alu <= not left; + when alu_clr | alu_ld8 | alu_ld16 => + out_alu <= right; -- clr, ld + when alu_st8 | alu_st16 => + out_alu <= left; + when alu_daa => + out_alu <= left + ("00000000" & daa_reg); + when alu_tpa => + out_alu <= "00000000" & cc; + when others => + out_alu <= left; -- nop + end case; + + -- + -- carry bit + -- + case alu_ctrl is + when alu_add8 | alu_adc => + cc_out(CBIT) <= (left(7) and right(7)) or + (left(7) and not out_alu(7)) or + (right(7) and not out_alu(7)); + when alu_sub8 | alu_sbc => + cc_out(CBIT) <= ((not left(7)) and right(7)) or + ((not left(7)) and out_alu(7)) or + (right(7) and out_alu(7)); + when alu_add16 => + cc_out(CBIT) <= (left(15) and right(15)) or + (left(15) and not out_alu(15)) or + (right(15) and not out_alu(15)); + when alu_sub16 => + cc_out(CBIT) <= ((not left(15)) and right(15)) or + ((not left(15)) and out_alu(15)) or + (right(15) and out_alu(15)); + when alu_ror8 | alu_lsr16 | alu_lsr8 | alu_asr8 => + cc_out(CBIT) <= left(0); + when alu_rol8 | alu_asl8 => + cc_out(CBIT) <= left(7); + when alu_lsl16 => + cc_out(CBIT) <= left(15); + when alu_com => + cc_out(CBIT) <= '1'; + when alu_neg | alu_clr => + cc_out(CBIT) <= out_alu(7) or out_alu(6) or out_alu(5) or out_alu(4) or + out_alu(3) or out_alu(2) or out_alu(1) or out_alu(0); + when alu_daa => + if ( daa_reg(7 downto 4) = "0110" ) then + cc_out(CBIT) <= '1'; + else + cc_out(CBIT) <= '0'; + end if; + when alu_sec => + cc_out(CBIT) <= '1'; + when alu_clc => + cc_out(CBIT) <= '0'; + when alu_tap => + cc_out(CBIT) <= left(CBIT); + when others => -- carry is not affected by cpx + cc_out(CBIT) <= cc(CBIT); + end case; + -- + -- Zero flag + -- + case alu_ctrl is + when alu_add8 | alu_sub8 | + alu_adc | alu_sbc | + alu_and | alu_ora | alu_eor | + alu_inc | alu_dec | + alu_neg | alu_com | alu_clr | + alu_rol8 | alu_ror8 | alu_asr8 | alu_asl8 | alu_lsr8 | + alu_ld8 | alu_st8 => + cc_out(ZBIT) <= not( out_alu(7) or out_alu(6) or out_alu(5) or out_alu(4) or + out_alu(3) or out_alu(2) or out_alu(1) or out_alu(0) ); + when alu_add16 | alu_sub16 | + alu_lsl16 | alu_lsr16 | + alu_inx | alu_dex | + alu_ld16 | alu_st16 | alu_cpx => + cc_out(ZBIT) <= not( out_alu(15) or out_alu(14) or out_alu(13) or out_alu(12) or + out_alu(11) or out_alu(10) or out_alu(9) or out_alu(8) or + out_alu(7) or out_alu(6) or out_alu(5) or out_alu(4) or + out_alu(3) or out_alu(2) or out_alu(1) or out_alu(0) ); + when alu_tap => + cc_out(ZBIT) <= left(ZBIT); + when others => + cc_out(ZBIT) <= cc(ZBIT); + end case; + + -- + -- negative flag + -- + case alu_ctrl is + when alu_add8 | alu_sub8 | + alu_adc | alu_sbc | + alu_and | alu_ora | alu_eor | + alu_rol8 | alu_ror8 | alu_asr8 | alu_asl8 | alu_lsr8 | + alu_inc | alu_dec | alu_neg | alu_com | alu_clr | + alu_ld8 | alu_st8 => + cc_out(NBIT) <= out_alu(7); + when alu_add16 | alu_sub16 | + alu_lsl16 | alu_lsr16 | + alu_ld16 | alu_st16 | alu_cpx => + cc_out(NBIT) <= out_alu(15); + when alu_tap => + cc_out(NBIT) <= left(NBIT); + when others => + cc_out(NBIT) <= cc(NBIT); + end case; + + -- + -- Interrupt mask flag + -- + case alu_ctrl is + when alu_sei => + cc_out(IBIT) <= '1'; -- set interrupt mask + when alu_cli => + cc_out(IBIT) <= '0'; -- clear interrupt mask + when alu_tap => + cc_out(IBIT) <= left(IBIT); + when others => + cc_out(IBIT) <= cc(IBIT); -- interrupt mask + end case; + + -- + -- Half Carry flag + -- + case alu_ctrl is + when alu_add8 | alu_adc => + cc_out(HBIT) <= (left(3) and right(3)) or + (right(3) and not out_alu(3)) or + (left(3) and not out_alu(3)); + when alu_tap => + cc_out(HBIT) <= left(HBIT); + when others => + cc_out(HBIT) <= cc(HBIT); + end case; + + -- + -- Overflow flag + -- + case alu_ctrl is + when alu_add8 | alu_adc => + cc_out(VBIT) <= (left(7) and right(7) and (not out_alu(7))) or + ((not left(7)) and (not right(7)) and out_alu(7)); + when alu_sub8 | alu_sbc => + cc_out(VBIT) <= (left(7) and (not right(7)) and (not out_alu(7))) or + ((not left(7)) and right(7) and out_alu(7)); + when alu_add16 => + cc_out(VBIT) <= (left(15) and right(15) and (not out_alu(15))) or + ((not left(15)) and (not right(15)) and out_alu(15)); + when alu_sub16 | alu_cpx => + cc_out(VBIT) <= (left(15) and (not right(15)) and (not out_alu(15))) or + ((not left(15)) and right(15) and out_alu(15)); + when alu_inc => + cc_out(VBIT) <= ((not left(7)) and left(6) and left(5) and left(4) and + left(3) and left(2) and left(1) and left(0)); + when alu_dec | alu_neg => + cc_out(VBIT) <= (left(7) and (not left(6)) and (not left(5)) and (not left(4)) and + (not left(3)) and (not left(2)) and (not left(1)) and (not left(0))); + when alu_asr8 => + cc_out(VBIT) <= left(0) xor left(7); + when alu_lsr8 | alu_lsr16 => + cc_out(VBIT) <= left(0); + when alu_ror8 => + cc_out(VBIT) <= left(0) xor cc(CBIT); + when alu_lsl16 => + cc_out(VBIT) <= left(15) xor left(14); + when alu_rol8 | alu_asl8 => + cc_out(VBIT) <= left(7) xor left(6); + when alu_tap => + cc_out(VBIT) <= left(VBIT); + when alu_and | alu_ora | alu_eor | alu_com | + alu_st8 | alu_st16 | alu_ld8 | alu_ld16 | + alu_clv => + cc_out(VBIT) <= '0'; + when alu_sev => + cc_out(VBIT) <= '1'; + when others => + cc_out(VBIT) <= cc(VBIT); + end case; + + case alu_ctrl is + when alu_tap => + cc_out(XBIT) <= cc(XBIT) and left(XBIT); + cc_out(SBIT) <= left(SBIT); + when others => + cc_out(XBIT) <= cc(XBIT) and left(XBIT); + cc_out(SBIT) <= cc(SBIT); + end case; + + test_alu <= out_alu; + test_cc <= cc_out; +end process; + +------------------------------------ +-- +-- Detect Edge of NMI interrupt +-- +------------------------------------ + +nmi_handler : process( clk, rst, nmi, nmi_ack ) +begin + if clk'event and clk='0' then + if hold = '1' then + nmi_req <= nmi_req; + else + if rst='1' then + nmi_req <= '0'; + else + if (nmi='1') and (nmi_ack='0') then + nmi_req <= '1'; + else + if (nmi='0') and (nmi_ack='1') then + nmi_req <= '0'; + else + nmi_req <= nmi_req; + end if; + end if; + end if; + end if; + end if; +end process; + +------------------------------------ +-- +-- Nmi mux +-- +------------------------------------ + +nmi_mux: process( clk, nmi_ctrl, nmi_ack, hold ) +begin + if clk'event and clk='0' then + if hold = '1' then + nmi_ack <= nmi_ack; + else + case nmi_ctrl is + when set_nmi => + nmi_ack <= '1'; + when reset_nmi => + nmi_ack <= '0'; + when others => +-- when latch_nmi => + nmi_ack <= nmi_ack; + end case; + end if; + end if; +end process; + +------------------------------------ +-- +-- state sequencer +-- +------------------------------------ +process( state, op_code, cc, ea, irq, nmi_req, nmi_ack, hold, halt ) + begin + case state is + when reset_state => -- released from reset + -- reset the registers + op_ctrl <= reset_op; + acca_ctrl <= reset_acca; + accb_ctrl <= reset_accb; + ix_ctrl <= reset_ix; + sp_ctrl <= reset_sp; + pc_ctrl <= reset_pc; + ea_ctrl <= reset_ea; + md_ctrl <= reset_md; + iv_ctrl <= reset_iv; + nmi_ctrl <= reset_nmi; + -- idle the ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= reset_cc; + -- idle the bus + dout_ctrl <= md_lo_dout; + addr_ctrl <= idle_ad; + next_state <= vect_hi_state; + + -- + -- Jump via interrupt vector + -- iv holds interrupt type + -- fetch PC hi from vector location + -- + when vect_hi_state => + -- default the registers + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + md_ctrl <= latch_md; + ea_ctrl <= latch_ea; + iv_ctrl <= latch_iv; + -- idle the ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- fetch pc low interrupt vector + pc_ctrl <= pull_hi_pc; + addr_ctrl <= int_hi_ad; + dout_ctrl <= pc_hi_dout; + next_state <= vect_lo_state; + -- + -- jump via interrupt vector + -- iv holds vector type + -- fetch PC lo from vector location + -- + when vect_lo_state => + -- default the registers + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + md_ctrl <= latch_md; + ea_ctrl <= latch_ea; + iv_ctrl <= latch_iv; + -- idle the ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- fetch the vector low byte + pc_ctrl <= pull_lo_pc; + addr_ctrl <= int_lo_ad; + dout_ctrl <= pc_lo_dout; + next_state <= fetch_state; + + -- + -- Here to fetch an instruction + -- PC points to opcode + -- Should service interrupt requests at this point + -- either from the timer + -- or from the external input. + -- + when fetch_state => + case op_code(7 downto 4) is + when "0000" | + "0001" | + "0010" | -- branch conditional + "0011" | + "0100" | -- acca single op + "0101" | -- accb single op + "0110" | -- indexed single op + "0111" => -- extended single op + -- idle ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + + when "1000" | -- acca immediate + "1001" | -- acca direct + "1010" | -- acca indexed + "1011" => -- acca extended + case op_code(3 downto 0) is + when "0000" => -- suba + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0001" => -- cmpa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0010" => -- sbca + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sbc; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0011" => -- subd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0100" => -- anda + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0101" => -- bita + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0110" => -- ldaa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0111" => -- staa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1000" => -- eora + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_eor; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1001" => -- adca + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_adc; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1010" => -- oraa + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ora; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1011" => -- adda + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1100" => -- cpx + left_ctrl <= ix_left; + right_ctrl <= md_right; + alu_ctrl <= alu_cpx; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1101" => -- bsr / jsr + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1110" => -- lds + left_ctrl <= sp_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + when "1111" => -- sts + left_ctrl <= sp_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when others => + left_ctrl <= acca_left; + right_ctrl <= md_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + end case; + when "1100" | -- accb immediate + "1101" | -- accb direct + "1110" | -- accb indexed + "1111" => -- accb extended + case op_code(3 downto 0) is + when "0000" => -- subb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0001" => -- cmpb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0010" => -- sbcb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_sbc; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0011" => -- addd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0100" => -- andb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0101" => -- bitb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_and; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0110" => -- ldab + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "0111" => -- stab + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1000" => -- eorb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_eor; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1001" => -- adcb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_adc; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1010" => -- orab + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ora; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1011" => -- addb + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1100" => -- ldd + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1101" => -- std + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when "1110" => -- ldx + left_ctrl <= ix_left; + right_ctrl <= md_right; + alu_ctrl <= alu_ld16; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= load_ix; + sp_ctrl <= latch_sp; + when "1111" => -- stx + left_ctrl <= ix_left; + right_ctrl <= md_right; + alu_ctrl <= alu_st16; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + when others => + left_ctrl <= accb_left; + right_ctrl <= md_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + end case; + when others => + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + end case; + md_ctrl <= latch_md; + -- fetch the op code + op_ctrl <= fetch_op; + ea_ctrl <= reset_ea; + addr_ctrl <= fetch_ad; + dout_ctrl <= md_lo_dout; + iv_ctrl <= latch_iv; + if halt = '1' then + pc_ctrl <= latch_pc; + nmi_ctrl <= latch_nmi; + next_state <= halt_state; + -- service non maskable interrupts + elsif (nmi_req = '1') and (nmi_ack = '0') then + pc_ctrl <= latch_pc; + nmi_ctrl <= set_nmi; + next_state <= int_pcl_state; + -- service maskable interrupts + else + -- + -- nmi request is not cleared until nmi input goes low + -- + if(nmi_req = '0') and (nmi_ack='1') then + nmi_ctrl <= reset_nmi; + else + nmi_ctrl <= latch_nmi; + end if; + -- + -- IRQ is level sensitive + -- + if (irq = '1') and (cc(IBIT) = '0') then + pc_ctrl <= latch_pc; + next_state <= int_pcl_state; + else + -- Advance the PC to fetch next instruction byte + pc_ctrl <= inc_pc; + next_state <= decode_state; + end if; + end if; + -- + -- Here to decode instruction + -- and fetch next byte of intruction + -- whether it be necessary or not + -- + when decode_state => + -- fetch first byte of address or immediate data + ea_ctrl <= fetch_first_ea; + addr_ctrl <= fetch_ad; + dout_ctrl <= md_lo_dout; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + iv_ctrl <= latch_iv; + case op_code(7 downto 4) is + when "0000" => + md_ctrl <= fetch_first_md; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + case op_code(3 downto 0) is + when "0001" => -- nop + left_ctrl <= accd_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "0100" => -- lsrd + left_ctrl <= accd_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + when "0101" => -- lsld + left_ctrl <= accd_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_lsl16; + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + ix_ctrl <= latch_ix; + when "0110" => -- tap + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_tap; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "0111" => -- tpa + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_tpa; + cc_ctrl <= latch_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "1000" => -- inx + left_ctrl <= ix_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_inx; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= load_ix; + when "1001" => -- dex + left_ctrl <= ix_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_dex; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= load_ix; + when "1010" => -- clv + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_clv; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "1011" => -- sev + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_sev; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "1100" => -- clc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_clc; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "1101" => -- sec + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_sec; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "1110" => -- cli + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_cli; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when "1111" => -- sei + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_sei; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + end case; + next_state <= fetch_state; + -- acca / accb inherent instructions + when "0001" => + md_ctrl <= fetch_first_md; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + left_ctrl <= acca_left; + right_ctrl <= accb_right; + case op_code(3 downto 0) is + when "0000" => -- sba + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + when "0001" => -- cba + alu_ctrl <= alu_sub8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + when "0110" => -- tab + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= load_accb; + when "0111" => -- tba + alu_ctrl <= alu_ld8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + when "1001" => -- daa + alu_ctrl <= alu_daa; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + when "1011" => -- aba + alu_ctrl <= alu_add8; + cc_ctrl <= load_cc; + acca_ctrl <= load_acca; + accb_ctrl <= latch_accb; + when others => + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end case; + next_state <= fetch_state; + when "0010" => -- branch conditional + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- increment the pc + pc_ctrl <= inc_pc; + case op_code(3 downto 0) is + when "0000" => -- bra + next_state <= branch_state; + when "0001" => -- brn + next_state <= fetch_state; + when "0010" => -- bhi + if (cc(CBIT) or cc(ZBIT)) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "0011" => -- bls + if (cc(CBIT) or cc(ZBIT)) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "0100" => -- bcc/bhs + if cc(CBIT) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "0101" => -- bcs/blo + if cc(CBIT) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "0110" => -- bne + if cc(ZBIT) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "0111" => -- beq + if cc(ZBIT) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1000" => -- bvc + if cc(VBIT) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1001" => -- bvs + if cc(VBIT) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1010" => -- bpl + if cc(NBIT) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1011" => -- bmi + if cc(NBIT) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1100" => -- bge + if (cc(NBIT) xor cc(VBIT)) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1101" => -- blt + if (cc(NBIT) xor cc(VBIT)) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1110" => -- bgt + if (cc(ZBIT) or (cc(NBIT) xor cc(VBIT))) = '0' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when "1111" => -- ble + if (cc(ZBIT) or (cc(NBIT) xor cc(VBIT))) = '1' then + next_state <= branch_state; + else + next_state <= fetch_state; + end if; + when others => + next_state <= fetch_state; + end case; + -- + -- Single byte stack operators + -- Do not advance PC + -- + when "0011" => + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + pc_ctrl <= latch_pc; + case op_code(3 downto 0) is + when "0000" => -- tsx + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= load_ix; + sp_ctrl <= latch_sp; + next_state <= fetch_state; + when "0001" => -- ins + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= fetch_state; + when "0010" => -- pula + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= pula_state; + when "0011" => -- pulb + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= pulb_state; + when "0100" => -- des + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= fetch_state; + when "0101" => -- txs + left_ctrl <= ix_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= fetch_state; + when "0110" => -- psha + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= psha_state; + when "0111" => -- pshb + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= pshb_state; + when "1000" => -- pulx + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= pulx_hi_state; + when "1001" => -- rts + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= rts_hi_state; + when "1010" => -- abx + left_ctrl <= ix_left; + right_ctrl <= accb_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= load_ix; + sp_ctrl <= latch_sp; + next_state <= fetch_state; + when "1011" => -- rti + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= load_sp; + next_state <= rti_cc_state; + when "1100" => -- pshx + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= pshx_lo_state; + when "1101" => -- mul + left_ctrl <= acca_left; + right_ctrl <= accb_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= mul_state; + when "1110" => -- wai + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= int_pcl_state; + when "1111" => -- swi + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= int_pcl_state; + when others => + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + next_state <= fetch_state; + end case; + -- + -- Accumulator A Single operand + -- source = Acc A dest = Acc A + -- Do not advance PC + -- + when "0100" => -- acca single op + md_ctrl <= fetch_first_md; + accb_ctrl <= latch_accb; + pc_ctrl <= latch_pc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + left_ctrl <= acca_left; + case op_code(3 downto 0) is + when "0000" => -- neg + right_ctrl <= zero_right; + alu_ctrl <= alu_neg; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "0011" => -- com + right_ctrl <= zero_right; + alu_ctrl <= alu_com; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "0100" => -- lsr + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "0110" => -- ror + right_ctrl <= zero_right; + alu_ctrl <= alu_ror8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "0111" => -- asr + right_ctrl <= zero_right; + alu_ctrl <= alu_asr8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "1000" => -- asl + right_ctrl <= zero_right; + alu_ctrl <= alu_asl8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "1001" => -- rol + right_ctrl <= zero_right; + alu_ctrl <= alu_rol8; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "1010" => -- dec + right_ctrl <= plus_one_right; + alu_ctrl <= alu_dec; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "1011" => -- undefined + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + acca_ctrl <= latch_acca; + cc_ctrl <= latch_cc; + when "1100" => -- inc + right_ctrl <= plus_one_right; + alu_ctrl <= alu_inc; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when "1101" => -- tst + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + acca_ctrl <= latch_acca; + cc_ctrl <= load_cc; + when "1110" => -- jmp + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + acca_ctrl <= latch_acca; + cc_ctrl <= latch_cc; + when "1111" => -- clr + right_ctrl <= zero_right; + alu_ctrl <= alu_clr; + acca_ctrl <= load_acca; + cc_ctrl <= load_cc; + when others => + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + acca_ctrl <= latch_acca; + cc_ctrl <= latch_cc; + end case; + next_state <= fetch_state; + -- + -- single operand acc b + -- Do not advance PC + -- + when "0101" => + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + pc_ctrl <= latch_pc; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + left_ctrl <= accb_left; + case op_code(3 downto 0) is + when "0000" => -- neg + right_ctrl <= zero_right; + alu_ctrl <= alu_neg; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "0011" => -- com + right_ctrl <= zero_right; + alu_ctrl <= alu_com; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "0100" => -- lsr + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "0110" => -- ror + right_ctrl <= zero_right; + alu_ctrl <= alu_ror8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "0111" => -- asr + right_ctrl <= zero_right; + alu_ctrl <= alu_asr8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "1000" => -- asl + right_ctrl <= zero_right; + alu_ctrl <= alu_asl8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "1001" => -- rol + right_ctrl <= zero_right; + alu_ctrl <= alu_rol8; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "1010" => -- dec + right_ctrl <= plus_one_right; + alu_ctrl <= alu_dec; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "1011" => -- undefined + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + accb_ctrl <= latch_accb; + cc_ctrl <= latch_cc; + when "1100" => -- inc + right_ctrl <= plus_one_right; + alu_ctrl <= alu_inc; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when "1101" => -- tst + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + accb_ctrl <= latch_accb; + cc_ctrl <= load_cc; + when "1110" => -- jmp + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + accb_ctrl <= latch_accb; + cc_ctrl <= latch_cc; + when "1111" => -- clr + right_ctrl <= zero_right; + alu_ctrl <= alu_clr; + accb_ctrl <= load_accb; + cc_ctrl <= load_cc; + when others => + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + accb_ctrl <= latch_accb; + cc_ctrl <= latch_cc; + end case; + next_state <= fetch_state; + -- + -- Single operand indexed + -- Two byte instruction so advance PC + -- EA should hold index offset + -- + when "0110" => -- indexed single op + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + next_state <= indexed_state; + -- + -- Single operand extended addressing + -- three byte instruction so advance the PC + -- Low order EA holds high order address + -- + when "0111" => -- extended single op + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + next_state <= extended_state; + + when "1000" => -- acca immediate + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + case op_code(3 downto 0) is + when "0011" | -- subdd # + "1100" | -- cpx # + "1110" => -- lds # + next_state <= immediate16_state; + when "1101" => -- bsr + next_state <= bsr_state; + when others => + next_state <= fetch_state; + end case; + + when "1001" => -- acca direct + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + pc_ctrl <= inc_pc; + case op_code(3 downto 0) is + when "0111" => -- staa direct + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1111" => -- sts direct + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when "1101" => -- jsr direct + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + next_state <= jsr_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + next_state <= read8_state; + end case; + + when "1010" => -- acca indexed + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + next_state <= indexed_state; + + when "1011" => -- acca extended + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + next_state <= extended_state; + + when "1100" => -- accb immediate + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + case op_code(3 downto 0) is + when "0011" | -- addd # + "1100" | -- ldd # + "1110" => -- ldx # + next_state <= immediate16_state; + when others => + next_state <= fetch_state; + end case; + + when "1101" => -- accb direct + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + pc_ctrl <= inc_pc; + case op_code(3 downto 0) is + when "0111" => -- stab direct + left_ctrl <= accb_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1101" => -- std direct + left_ctrl <= accd_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when "1111" => -- stx direct + left_ctrl <= ix_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + next_state <= read8_state; + end case; + + when "1110" => -- accb indexed + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + next_state <= indexed_state; + + when "1111" => -- accb extended + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- increment the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + next_state <= extended_state; + + when others => + md_ctrl <= fetch_first_md; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + -- idle the pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= latch_pc; + next_state <= fetch_state; + end case; + + when immediate16_state => + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + op_ctrl <= latch_op; + iv_ctrl <= latch_iv; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment pc + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= inc_pc; + -- fetch next immediate byte + md_ctrl <= fetch_next_md; + addr_ctrl <= fetch_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + -- + -- ea holds 8 bit index offet + -- calculate the effective memory address + -- using the alu + -- + when indexed_state => + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + -- calculate effective address from index reg + -- index offest is not sign extended + ea_ctrl <= add_ix_ea; + -- idle the bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + -- work out next state + case op_code(7 downto 4) is + when "0110" => -- single op indexed + md_ctrl <= latch_md; + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + case op_code(3 downto 0) is + when "1011" => -- undefined + next_state <= fetch_state; + when "1110" => -- jmp + next_state <= jmp_state; + when others => + next_state <= read8_state; + end case; + when "1010" => -- acca indexed + case op_code(3 downto 0) is + when "0111" => -- staa + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1101" => -- jsr + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= jsr_state; + when "1111" => -- sts + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= read8_state; + end case; + when "1110" => -- accb indexed + case op_code(3 downto 0) is + when "0111" => -- stab direct + left_ctrl <= accb_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1101" => -- std direct + left_ctrl <= accd_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when "1111" => -- stx direct + left_ctrl <= ix_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= read8_state; + end case; + when others => + md_ctrl <= latch_md; + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + next_state <= fetch_state; + end case; + -- + -- ea holds the low byte of the absolute address + -- Move ea low byte into ea high byte + -- load new ea low byte to for absolute 16 bit address + -- advance the program counter + -- + when extended_state => -- fetch ea low byte + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + -- increment pc + pc_ctrl <= inc_pc; + -- fetch next effective address bytes + ea_ctrl <= fetch_next_ea; + addr_ctrl <= fetch_ad; + dout_ctrl <= md_lo_dout; + -- work out the next state + case op_code(7 downto 4) is + when "0111" => -- single op extended + md_ctrl <= latch_md; + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + case op_code(3 downto 0) is + when "1011" => -- undefined + next_state <= fetch_state; + when "1110" => -- jmp + next_state <= jmp_state; + when others => + next_state <= read8_state; + end case; + when "1011" => -- acca extended + case op_code(3 downto 0) is + when "0111" => -- staa + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1101" => -- jsr + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= jsr_state; + when "1111" => -- sts + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= read8_state; + end case; + when "1111" => -- accb extended + case op_code(3 downto 0) is + when "0111" => -- stab + left_ctrl <= accb_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1101" => -- std + left_ctrl <= accd_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when "1111" => -- stx + left_ctrl <= ix_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= read8_state; + end case; + when others => + md_ctrl <= latch_md; + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + next_state <= fetch_state; + end case; + -- + -- here if ea holds low byte (direct page) + -- can enter here from extended addressing + -- read memory location + -- note that reads may be 8 or 16 bits + -- + when read8_state => -- read data + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + -- + addr_ctrl <= read_ad; + dout_ctrl <= md_lo_dout; + case op_code(7 downto 4) is + when "0110" | "0111" => -- single operand + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + ea_ctrl <= latch_ea; + next_state <= execute_state; + + when "1001" | "1010" | "1011" => -- acca + case op_code(3 downto 0) is + when "0011" | -- subd + "1110" | -- lds + "1100" => -- cpx + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + -- increment the effective address in case of 16 bit load + ea_ctrl <= inc_ea; + next_state <= read16_state; +-- when "0111" => -- staa +-- left_ctrl <= acca_left; +-- right_ctrl <= zero_right; +-- alu_ctrl <= alu_st8; +-- cc_ctrl <= latch_cc; +-- md_ctrl <= load_md; +-- ea_ctrl <= latch_ea; +-- next_state <= write8_state; +-- when "1101" => -- jsr +-- left_ctrl <= acca_left; +-- right_ctrl <= zero_right; +-- alu_ctrl <= alu_nop; +-- cc_ctrl <= latch_cc; +-- md_ctrl <= latch_md; +-- ea_ctrl <= latch_ea; +-- next_state <= jsr_state; +-- when "1111" => -- sts +-- left_ctrl <= sp_left; +-- right_ctrl <= zero_right; +-- alu_ctrl <= alu_st16; +-- cc_ctrl <= latch_cc; +-- md_ctrl <= load_md; +-- ea_ctrl <= latch_ea; +-- next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + ea_ctrl <= latch_ea; + next_state <= fetch_state; + end case; + + when "1101" | "1110" | "1111" => -- accb + case op_code(3 downto 0) is + when "0011" | -- addd + "1100" | -- ldd + "1110" => -- ldx + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + -- increment the effective address in case of 16 bit load + ea_ctrl <= inc_ea; + next_state <= read16_state; +-- when "0111" => -- stab +-- left_ctrl <= accb_left; +-- right_ctrl <= zero_right; +-- alu_ctrl <= alu_st8; +-- cc_ctrl <= latch_cc; +-- md_ctrl <= load_md; +-- ea_ctrl <= latch_ea; +-- next_state <= write8_state; +-- when "1101" => -- std +-- left_ctrl <= accd_left; +-- right_ctrl <= zero_right; +-- alu_ctrl <= alu_st16; +-- cc_ctrl <= latch_cc; +-- md_ctrl <= load_md; +-- ea_ctrl <= latch_ea; +-- next_state <= write16_state; +-- when "1111" => -- stx +-- left_ctrl <= ix_left; +-- right_ctrl <= zero_right; +-- alu_ctrl <= alu_st16; +-- cc_ctrl <= latch_cc; +-- md_ctrl <= load_md; +-- ea_ctrl <= latch_ea; +-- next_state <= write16_state; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + ea_ctrl <= latch_ea; + next_state <= execute_state; + end case; + when others => + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= fetch_first_md; + ea_ctrl <= latch_ea; + next_state <= fetch_state; + end case; + + when read16_state => -- read second data byte from ea + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- idle the effective address + ea_ctrl <= latch_ea; + -- read the low byte of the 16 bit data + md_ctrl <= fetch_next_md; + addr_ctrl <= read_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + -- + -- 16 bit Write state + -- write high byte of ALU output. + -- EA hold address of memory to write to + -- Advance the effective address in ALU + -- + when write16_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + -- increment the effective address + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + ea_ctrl <= inc_ea; + -- write the ALU hi byte to ea + addr_ctrl <= write_ad; + dout_ctrl <= md_hi_dout; + next_state <= write8_state; + -- + -- 8 bit write + -- Write low 8 bits of ALU output + -- + when write8_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- idle the ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- write ALU low byte output + addr_ctrl <= write_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + + when jmp_state => + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- load PC with effective address + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= load_ea_pc; + -- idle the bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + + when jsr_state => -- JSR + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write pc low + addr_ctrl <= push_ad; + dout_ctrl <= pc_lo_dout; + next_state <= jsr1_state; + + when jsr1_state => -- JSR + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write pc hi + addr_ctrl <= push_ad; + dout_ctrl <= pc_hi_dout; + next_state <= jmp_state; + + when branch_state => -- Bcc + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- calculate signed branch + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + pc_ctrl <= add_ea_pc; + -- idle the bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + + when bsr_state => -- BSR + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write pc low + addr_ctrl <= push_ad; + dout_ctrl <= pc_lo_dout; + next_state <= bsr1_state; + + when bsr1_state => -- BSR + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write pc hi + addr_ctrl <= push_ad; + dout_ctrl <= pc_hi_dout; + next_state <= branch_state; + + when rts_hi_state => -- RTS + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment the sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- read pc hi + pc_ctrl <= pull_hi_pc; + addr_ctrl <= pull_ad; + dout_ctrl <= pc_hi_dout; + next_state <= rts_lo_state; + + when rts_lo_state => -- RTS1 + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- idle the ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- read pc low + pc_ctrl <= pull_lo_pc; + addr_ctrl <= pull_ad; + dout_ctrl <= pc_lo_dout; + next_state <= fetch_state; + + when mul_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- move acca to md + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_st16; + cc_ctrl <= latch_cc; + md_ctrl <= load_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mulea_state; + + when mulea_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + md_ctrl <= latch_md; + -- idle ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- move accb to ea + ea_ctrl <= load_accb_ea; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= muld_state; + + when muld_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + md_ctrl <= latch_md; + -- clear accd + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_ld8; + cc_ctrl <= latch_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul0_state; + + when mul0_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 0 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(0) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul1_state; + + when mul1_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 1 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(1) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul2_state; + + when mul2_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 2 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(2) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul3_state; + + when mul3_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 3 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(3) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul4_state; + + when mul4_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 4 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(4) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul5_state; + + when mul5_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 5 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(5) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul6_state; + + when mul6_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 6 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(6) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= mul7_state; + + when mul7_state => + -- default + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- if bit 7 of ea set, add accd to md + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_add16; + if ea(7) = '1' then + cc_ctrl <= load_cc; + acca_ctrl <= load_hi_acca; + accb_ctrl <= load_accb; + else + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + end if; + md_ctrl <= shiftl_md; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + + when execute_state => -- execute single operand instruction + -- default + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + case op_code(7 downto 4) is + when "0110" | -- indexed single op + "0111" => -- extended single op + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + iv_ctrl <= latch_iv; + ea_ctrl <= latch_ea; + -- idle the bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + left_ctrl <= md_left; + case op_code(3 downto 0) is + when "0000" => -- neg + right_ctrl <= zero_right; + alu_ctrl <= alu_neg; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "0011" => -- com + right_ctrl <= zero_right; + alu_ctrl <= alu_com; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "0100" => -- lsr + right_ctrl <= zero_right; + alu_ctrl <= alu_lsr8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "0110" => -- ror + right_ctrl <= zero_right; + alu_ctrl <= alu_ror8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "0111" => -- asr + right_ctrl <= zero_right; + alu_ctrl <= alu_asr8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1000" => -- asl + right_ctrl <= zero_right; + alu_ctrl <= alu_asl8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1001" => -- rol + right_ctrl <= zero_right; + alu_ctrl <= alu_rol8; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1010" => -- dec + right_ctrl <= plus_one_right; + alu_ctrl <= alu_dec; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1011" => -- undefined + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= fetch_state; + when "1100" => -- inc + right_ctrl <= plus_one_right; + alu_ctrl <= alu_inc; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when "1101" => -- tst + right_ctrl <= zero_right; + alu_ctrl <= alu_st8; + cc_ctrl <= load_cc; + md_ctrl <= latch_md; + next_state <= fetch_state; + when "1110" => -- jmp + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= fetch_state; + when "1111" => -- clr + right_ctrl <= zero_right; + alu_ctrl <= alu_clr; + cc_ctrl <= load_cc; + md_ctrl <= load_md; + next_state <= write8_state; + when others => + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + md_ctrl <= latch_md; + next_state <= fetch_state; + end case; + + when others => + left_ctrl <= accd_left; + right_ctrl <= md_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + ea_ctrl <= latch_ea; + -- idle the bus + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= fetch_state; + end case; + + when psha_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write acca + addr_ctrl <= push_ad; + dout_ctrl <= acca_dout; + next_state <= fetch_state; + + when pula_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- idle sp + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + sp_ctrl <= latch_sp; + -- read acca + acca_ctrl <= pull_acca; + addr_ctrl <= pull_ad; + dout_ctrl <= acca_dout; + next_state <= fetch_state; + + when pshb_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write accb + addr_ctrl <= push_ad; + dout_ctrl <= accb_dout; + next_state <= fetch_state; + + when pulb_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- idle sp + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + sp_ctrl <= latch_sp; + -- read accb + accb_ctrl <= pull_accb; + addr_ctrl <= pull_ad; + dout_ctrl <= accb_dout; + next_state <= fetch_state; + + when pshx_lo_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write ix low + addr_ctrl <= push_ad; + dout_ctrl <= ix_lo_dout; + next_state <= pshx_hi_state; + + when pshx_hi_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write ix hi + addr_ctrl <= push_ad; + dout_ctrl <= ix_hi_dout; + next_state <= fetch_state; + + when pulx_hi_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- pull ix hi + ix_ctrl <= pull_hi_ix; + addr_ctrl <= pull_ad; + dout_ctrl <= ix_hi_dout; + next_state <= pulx_lo_state; + + when pulx_lo_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- idle sp + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + sp_ctrl <= latch_sp; + -- read ix low + ix_ctrl <= pull_lo_ix; + addr_ctrl <= pull_ad; + dout_ctrl <= ix_lo_dout; + next_state <= fetch_state; + + -- + -- return from interrupt + -- enter here from bogus interrupts + -- + when rti_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- idle address bus + cc_ctrl <= latch_cc; + addr_ctrl <= idle_ad; + dout_ctrl <= cc_dout; + next_state <= rti_cc_state; + + when rti_cc_state => + -- default registers + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + sp_ctrl <= load_sp; + -- read cc + cc_ctrl <= pull_cc; + addr_ctrl <= pull_ad; + dout_ctrl <= cc_dout; + next_state <= rti_accb_state; + + when rti_accb_state => + -- default registers + acca_ctrl <= latch_acca; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- read accb + accb_ctrl <= pull_accb; + addr_ctrl <= pull_ad; + dout_ctrl <= accb_dout; + next_state <= rti_acca_state; + + when rti_acca_state => + -- default registers + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- read acca + acca_ctrl <= pull_acca; + addr_ctrl <= pull_ad; + dout_ctrl <= acca_dout; + next_state <= rti_ixh_state; + + when rti_ixh_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- read ix hi + ix_ctrl <= pull_hi_ix; + addr_ctrl <= pull_ad; + dout_ctrl <= ix_hi_dout; + next_state <= rti_ixl_state; + + when rti_ixl_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- read ix low + ix_ctrl <= pull_lo_ix; + addr_ctrl <= pull_ad; + dout_ctrl <= ix_lo_dout; + next_state <= rti_pch_state; + + when rti_pch_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- increment sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_add16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- pull pc hi + pc_ctrl <= pull_hi_pc; + addr_ctrl <= pull_ad; + dout_ctrl <= pc_hi_dout; + next_state <= rti_pcl_state; + + when rti_pcl_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- idle sp + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + sp_ctrl <= latch_sp; + -- pull pc low + pc_ctrl <= pull_lo_pc; + addr_ctrl <= pull_ad; + dout_ctrl <= pc_lo_dout; + next_state <= fetch_state; + + -- + -- here on interrupt + -- iv register hold interrupt type + -- + when int_pcl_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write pc low + addr_ctrl <= push_ad; + dout_ctrl <= pc_lo_dout; + next_state <= int_pch_state; + + when int_pch_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write pc hi + addr_ctrl <= push_ad; + dout_ctrl <= pc_hi_dout; + next_state <= int_ixl_state; + + when int_ixl_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write ix low + addr_ctrl <= push_ad; + dout_ctrl <= ix_lo_dout; + next_state <= int_ixh_state; + + when int_ixh_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write ix hi + addr_ctrl <= push_ad; + dout_ctrl <= ix_hi_dout; + next_state <= int_acca_state; + + when int_acca_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write acca + addr_ctrl <= push_ad; + dout_ctrl <= acca_dout; + next_state <= int_accb_state; + + + when int_accb_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write accb + addr_ctrl <= push_ad; + dout_ctrl <= accb_dout; + next_state <= int_cc_state; + + when int_cc_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- decrement sp + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_sub16; + cc_ctrl <= latch_cc; + sp_ctrl <= load_sp; + -- write cc + addr_ctrl <= push_ad; + dout_ctrl <= cc_dout; + nmi_ctrl <= latch_nmi; + -- + -- nmi is edge triggered + -- nmi_req is cleared when nmi goes low. + -- + if nmi_req = '1' then + iv_ctrl <= nmi_iv; + next_state <= vect_hi_state; + else + -- + -- IRQ is level sensitive + -- + if (irq = '1') and (cc(IBIT) = '0') then + iv_ctrl <= irq_iv; + next_state <= int_mask_state; + else + case op_code is + when "00111110" => -- WAI (wait for interrupt) + iv_ctrl <= latch_iv; + next_state <= int_wai_state; + when "00111111" => -- SWI (Software interrupt) + iv_ctrl <= swi_iv; + next_state <= vect_hi_state; + when others => -- bogus interrupt (return) + iv_ctrl <= latch_iv; + next_state <= rti_state; + end case; + end if; + end if; + + when int_wai_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + op_ctrl <= latch_op; + ea_ctrl <= latch_ea; + -- enable interrupts + left_ctrl <= sp_left; + right_ctrl <= plus_one_right; + alu_ctrl <= alu_cli; + cc_ctrl <= load_cc; + sp_ctrl <= latch_sp; + -- idle bus + addr_ctrl <= idle_ad; + dout_ctrl <= cc_dout; + if (nmi_req = '1') and (nmi_ack='0') then + iv_ctrl <= nmi_iv; + nmi_ctrl <= set_nmi; + next_state <= vect_hi_state; + else + -- + -- nmi request is not cleared until nmi input goes low + -- + if (nmi_req = '0') and (nmi_ack='1') then + nmi_ctrl <= reset_nmi; + else + nmi_ctrl <= latch_nmi; + end if; + -- + -- IRQ is level sensitive + -- + if (irq = '1') and (cc(IBIT) = '0') then + iv_ctrl <= irq_iv; + next_state <= int_mask_state; + else + iv_ctrl <= latch_iv; + next_state <= int_wai_state; + end if; + end if; + + when int_mask_state => + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- Mask IRQ + left_ctrl <= sp_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_sei; + cc_ctrl <= load_cc; + sp_ctrl <= latch_sp; + -- idle bus cycle + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= vect_hi_state; + + when halt_state => -- halt CPU. + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- do nothing in ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- idle bus cycle + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + if halt = '1' then + next_state <= halt_state; + else + next_state <= fetch_state; + end if; + + when others => -- error state halt on undefine states + -- default + acca_ctrl <= latch_acca; + accb_ctrl <= latch_accb; + ix_ctrl <= latch_ix; + sp_ctrl <= latch_sp; + pc_ctrl <= latch_pc; + md_ctrl <= latch_md; + iv_ctrl <= latch_iv; + op_ctrl <= latch_op; + nmi_ctrl <= latch_nmi; + ea_ctrl <= latch_ea; + -- do nothing in ALU + left_ctrl <= acca_left; + right_ctrl <= zero_right; + alu_ctrl <= alu_nop; + cc_ctrl <= latch_cc; + -- idle bus cycle + addr_ctrl <= idle_ad; + dout_ctrl <= md_lo_dout; + next_state <= error_state; + end case; +end process; + +-------------------------------- +-- +-- state machine +-- +-------------------------------- + +change_state: process( clk, rst, state, hold ) +begin + if clk'event and clk = '0' then + if rst = '1' then + state <= reset_state; + elsif hold = '1' then + state <= state; + else + state <= next_state; + end if; + end if; +end process; + -- output + +end CPU_ARCH; + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/dac.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/dac.vhd new file mode 100644 index 00000000..47b2185e --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/dac.vhd @@ -0,0 +1,48 @@ +------------------------------------------------------------------------------- +-- +-- Delta-Sigma DAC +-- +-- Refer to Xilinx Application Note XAPP154. +-- +-- This DAC requires an external RC low-pass filter: +-- +-- dac_o 0---XXXXX---+---0 analog audio +-- 3k3 | +-- === 4n7 +-- | +-- GND +-- +------------------------------------------------------------------------------- + +library ieee; + use ieee.std_logic_1164.all; + use ieee.numeric_std.all; + +entity dac is + generic ( + C_bits : integer := 10 + ); + port ( + clk_i : in std_logic; + res_n_i : in std_logic; + dac_i : in std_logic_vector(C_bits-1 downto 0); + dac_o : out std_logic + ); +end dac; + +architecture rtl of dac is + signal sig_in: unsigned(C_bits downto 0); +begin + seq: process(clk_i, res_n_i) + begin + if res_n_i = '0' then + sig_in <= to_unsigned(2**C_bits, sig_in'length); + dac_o <= '0'; + elsif rising_edge(clk_i) then + -- not dac_i(C_bits-1) effectively adds 0x8..0 to dac_i + --sig_in <= sig_in + unsigned(sig_in(C_bits) & (not dac_i(C_bits-1)) & dac_i(C_bits-2 downto 0)); + sig_in <= sig_in + unsigned(sig_in(C_bits) & dac_i); + dac_o <= sig_in(C_bits); + end if; + end process seq; +end rtl; diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/data_io.v b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/data_io.v new file mode 100644 index 00000000..4ca9518c --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/data_io.v @@ -0,0 +1,115 @@ +// +// data_io.v +// +// data_io for the MiST board +// http://code.google.com/p/mist-board/ +// +// Copyright (c) 2014 Till Harbaum +// +// This source file is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published +// by the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This source file is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see . +// +/////////////////////////////////////////////////////////////////////// + +module data_io +( + input clk_sys, + input SPI_SCK, + input SPI_SS2, + input SPI_DI, + + // ARM -> FPGA download + output reg ioctl_download = 0, // signal indicating an active download + output reg [7:0] ioctl_index, // menu index used to upload the file + output ioctl_wr, + output reg [24:0] ioctl_addr, + output reg [7:0] ioctl_dout +); + +/////////////////////////////// DOWNLOADING /////////////////////////////// + +reg [7:0] data_w; +reg [24:0] addr_w; +reg rclk = 0; + +localparam UIO_FILE_TX = 8'h53; +localparam UIO_FILE_TX_DAT = 8'h54; +localparam UIO_FILE_INDEX = 8'h55; + +// data_io has its own SPI interface to the io controller +always@(posedge SPI_SCK, posedge SPI_SS2) begin + reg [6:0] sbuf; + reg [7:0] cmd; + reg [4:0] cnt; + reg [24:0] addr; + + if(SPI_SS2) cnt <= 0; + else begin + rclk <= 0; + + // don't shift in last bit. It is evaluated directly + // when writing to ram + if(cnt != 15) sbuf <= { sbuf[5:0], SPI_DI}; + + // increase target address after write + if(rclk) addr <= addr + 1'd1; + + // count 0-7 8-15 8-15 ... + if(cnt < 15) cnt <= cnt + 1'd1; + else cnt <= 8; + + // finished command byte + if(cnt == 7) cmd <= {sbuf, SPI_DI}; + + // prepare/end transmission + if((cmd == UIO_FILE_TX) && (cnt == 15)) begin + // prepare + if(SPI_DI) begin + addr <= 0; + ioctl_download <= 1; + end else begin + addr_w <= addr; + ioctl_download <= 0; + end + end + + // command 0x54: UIO_FILE_TX + if((cmd == UIO_FILE_TX_DAT) && (cnt == 15)) begin + addr_w <= addr; + data_w <= {sbuf, SPI_DI}; + rclk <= 1; + end + + // expose file (menu) index + if((cmd == UIO_FILE_INDEX) && (cnt == 15)) ioctl_index <= {sbuf, SPI_DI}; + end +end + +assign ioctl_wr = |ioctl_wrd; +reg [1:0] ioctl_wrd; + +always@(negedge clk_sys) begin + reg rclkD, rclkD2; + + rclkD <= rclk; + rclkD2 <= rclkD; + ioctl_wrd<= {ioctl_wrd[0],1'b0}; + + if(rclkD & ~rclkD2) begin + ioctl_dout <= data_w; + ioctl_addr <= addr_w; + ioctl_wrd <= 2'b11; + end +end + +endmodule diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender.vhd new file mode 100644 index 00000000..847e141a --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender.vhd @@ -0,0 +1,797 @@ +--------------------------------------------------------------------------------- +-- Defender by Dar (darfpga@aol.fr) +-- http://darfpga.blogspot.fr +--------------------------------------------------------------------------------- +-- gen_ram.vhd & io_ps2_keyboard +-------------------------------- +-- Copyright 2005-2008 by Peter Wendrich (pwsoft@syntiac.com) +-- http://www.syntiac.com/fpga64.html +--------------------------------------------------------------------------------- +-- cpu09l - Version : 0128 +-- Synthesizable 6809 instruction compatible VHDL CPU core +-- Copyright (C) 2003 - 2010 John Kent +--------------------------------------------------------------------------------- +-- cpu68 - Version 9th Jan 2004 0.8 +-- 6800/01 compatible CPU core +-- GNU public license - December 2002 : John E. Kent +--------------------------------------------------------------------------------- +-- Educational use only +-- Do not redistribute synthetized file with roms +-- Do not redistribute roms whatever the form +-- Use at your own risk +--------------------------------------------------------------------------------- +-- Version 0.0 -- 15/10/2017 -- +-- initial version +--------------------------------------------------------------------------------- +-- Features : +-- TV 15KHz mode only (atm) +-- Cocktail mode : OK +-- +-- Use with MAME roms from defender.zip +-- +-- Use make_defender_proms.bat to build vhd file and bin from binaries +-- +-- Defender Hardware caracteristics : +-- +-- 1x6809 CPU accessing program rom and shared ram/devices +-- 3x16Ko video and working ram +-- 26Ko program roms +-- 1 pia for player I/O +-- 1 pia service switches, irq and sound selection to sound board +-- +-- 384 pixels x 260 line video scan, 16 colors per pixel +-- Ram palette 16 colors among 256 colors (3 red bits,3 green bits, 2 blue bits) +-- +-- 2 decoder proms for video scan and cocktail/upright flip +-- +-- No sprites, no char tiles +-- +-- 128x4 cmos ram (see defender_cmos_ram.vhd for initial values) +-- No save when power off (see also defender_cmos_ram.vhd) +-- +-- 1x6808/02 +-- 128x8 working ram +-- 4k program rom +-- 1 pia for sound selection cmd input and audio samples output + +--------------------------------------------------------------------------------- + +--------------------------------------------------------------------------------- +-- defender cmos data (see also defender_cmos_ram.vhd) +-- (ram is 128x4 => only 4 bits/address, that is only 1 hex digit/address) +-- +-- @ values - (fonction) meaning + +-- 0 0 - ? +-- 1 0005 - (01) coins left +-- 5 0000 - (02) coins center +-- 9 0000 - (03) coins right +-- 13 0005 - (04) total paid +-- 17 0000 - (05) ships won +---21 0000 - (06) total time +-- 25 0003 - (07) total ships + +-- -- 8 entries of 6 digits highscore + 3 ascii letters + +-- 29 021270 44 52 4A +-- 41 018315 53 41 4D +-- 53 015920 4C 45 44 +-- 65 014285 50 47 44 +-- 77 012520 43 52 42 +-- 89 011035 4D 52 53 +-- 101 008265 53 53 52 +-- 113 006010 54 4D 48 + +-- 125 00 - credits +-- 127 5 - ? + +-- -- protected data writeable only with coin door opened + +-- 128 A - ? +-- 129 0100 - (08) bonus ship level +-- 133 03 - (09) nb ships +-- 135 03 - (10) coinage select +-- 137 01 - (11) left coin mult +-- 139 04 - (12) center coin mult +-- 141 01 - (13) right coin mult +-- 143 01 - (14) coins for credit +-- 145 00 - (15) coins for bonus +-- 147 00 - (16) minimum coins +-- 149 00 - (17) free play +-- 151 05 - (18) game adjust 1 Stating difficulty 0=lib; 1=mod; 2=cons +-- 153 15 - (19) game adjust 2 Progessive wave diff. limit > 4-25 +-- 155 01 - (20) game adjust 3 Background sound 0=off; 1=on +-- 157 05 - (21) game adjust 4 Planet restore wave number +-- 159 00 - (22) game adjust 5 +-- 161 00 - (23) game adjust 6 +-- 163 00 - (24) game adjust 7 +-- 165 00 - (25) game adjust 8 +-- 167 00 - (26) game adjust 9 +-- 169 00 - (27) game adjust 10 + +-- 171 00000 - ? +-- 176 0000000000000000 - ? +-- 192 0000000000000000 - ? +-- 208 0000000000000000 - ? +-- 224 0000000000000000 - ? +-- 240 0000000000000000 - ? + +library ieee; +use ieee.std_logic_1164.all; +use ieee.std_logic_unsigned.all; +use ieee.numeric_std.all; + +entity defender is +port( + clk_sys : in std_logic; + clock_6 : in std_logic; + clk_1p79 : in std_logic; + clk_0p89 : in std_logic; + reset : in std_logic; + + dbg_cpu_addr : out std_logic_vector(15 downto 0); +-- tv15Khz_mode : in std_logic; + video_r : out std_logic_vector(2 downto 0); + video_g : out std_logic_vector(2 downto 0); + video_b : out std_logic_vector(1 downto 0); +-- video_clk : out std_logic; + video_csync : out std_logic; + video_blankn : out std_logic; + video_hs : out std_logic; + video_vs : out std_logic; + + audio_out : out std_logic_vector(7 downto 0); + + roms_addr : out std_logic_vector(14 downto 0); + roms_do : in std_logic_vector( 7 downto 0); + + + + btn_auto_up : in std_logic; + btn_advance : in std_logic; + btn_service : in std_logic; + + btn_left_coin : in std_logic; + btn_one_player : in std_logic; + btn_two_players: in std_logic; + + btn_ffire : in std_logic; + btn_bfire : in std_logic; + btn_mayday : in std_logic; + + btn_right : in std_logic; + btn_down : in std_logic; + btn_up : in std_logic; + + sw_coktail_table : in std_logic; + + cmd_select_players_btn : out std_logic + +); +end defender; + +architecture struct of defender is + + signal reset_n: std_logic; + signal clock_div : std_logic_vector(1 downto 0); + + signal clock_6n : std_logic; + + signal cpu_clock : std_logic; + signal cpu_a : std_logic_vector(15 downto 0); + signal cpu_addr : std_logic_vector(15 downto 0); + signal cpu_di : std_logic_vector( 7 downto 0); + signal cpu_do : std_logic_vector( 7 downto 0); + signal cpu_rw : std_logic; + signal cpu_irq : std_logic; + + signal wram_addr : std_logic_vector(13 downto 0); + signal wram_we : std_logic; + signal wram0_do : std_logic_vector( 7 downto 0); + signal wram0_we : std_logic; + signal wram1_do : std_logic_vector( 7 downto 0); + signal wram1_we : std_logic; + signal wram2_do : std_logic_vector( 7 downto 0); + signal wram2_we : std_logic; + + --signal roms_addr : std_logic_vector(14 downto 0); + --signal roms_do : std_logic_vector( 7 downto 0); + + signal roms_io_do : std_logic_vector( 7 downto 0); + + signal io_we : std_logic; + signal io_CS : std_logic; + + signal rom_page : std_logic_vector( 2 downto 0); + signal rom_page_we : std_logic; + + signal screen_ctrl : std_logic; + signal screen_ctrl_we : std_logic; + + signal cmos_do : std_logic_vector(3 downto 0); + signal cmos_we : std_logic; + + signal palette_addr : std_logic_vector(3 downto 0); + signal palette_we : std_logic; + signal palette_di : std_logic_vector( 7 downto 0); + signal palette_do : std_logic_vector( 7 downto 0); + + signal pias_clock : std_logic; + +-- pia io port a +-- bit 0 Fire +-- bit 1 Thrust +-- bit 2 Smart Bomb +-- bit 3 HyperSpace +-- bit 4 2 Players +-- bit 5 1 Player +-- bit 6 Reverse +-- bit 7 Down + +-- pia io port b +-- bit 0 Up +-- bit 7 1 for coktail table, 0 for upright cabinet +-- other <= GND + +-- pia io ca/cb +-- ca1, ca2, cb1 <= GND +-- cb2 ouput + w2_jumper => select player 1/2 buttons for COCktail table + + signal pia_io_CS : std_logic; + signal pia_io_rw_n : std_logic; + signal pia_io_do : std_logic_vector( 7 downto 0); + signal pia_io_pa_i : std_logic_vector( 7 downto 0); + signal pia_io_pb_i : std_logic_vector( 7 downto 0); + signal pia_io_cb2_o : std_logic; + + -- pia rom board port a + -- bit 0 Auto Up / manual Down + -- bit 1 Advance + -- bit 2 Right Coin (nc) + -- bit 3 High Score Reset + -- bit 4 Left Coin + -- bit 5 Center Coin (nc) + -- bit 6 led 2 (output) + -- bit 7 led 1 (output) + + -- pia rom board port b + -- bit 0-5 to sound board (output) + -- bit 6 led 4 (output) + -- bit 7 led 3 (output) + + -- pia rom board ca/cb + -- ca1 count 240 + -- ca2 coin door pin 7 (nc) + -- cb1 4ms + -- cb2 sound board pin 8 (H5-nc) + + signal pia_ROM_CS : std_logic; + signal pia_rom_rw_n : std_logic; + signal pia_rom_do : std_logic_vector( 7 downto 0); + signal pia_rom_irqa : std_logic; + signal pia_rom_irqb : std_logic; + signal pia_rom_pa_i : std_logic_vector( 7 downto 0); + signal pia_rom_pa_o : std_logic_vector( 7 downto 0); + signal pia_rom_pb_o : std_logic_vector( 7 downto 0); + + signal vcnt_240 : std_logic; + signal cnt_4ms : std_logic; + + signal cpu_to_video_addr : std_logic_vector(8 downto 0); + signal cpu_to_video_do : std_logic_vector(7 downto 0); + + signal video_scan_addr : std_logic_vector(8 downto 0); + signal video_scan_do : std_logic_vector(7 downto 0); + + signal pixel_cnt : std_logic_vector(2 downto 0); + signal hcnt : std_logic_vector(5 downto 0); + signal vcnt : std_logic_vector(8 downto 0); + + signal pixels : std_logic_vector(23 downto 0); + + signal hsync0,hsync1,hsync2,csync,hblank,vblank : std_logic; + + signal select_sound : std_logic_vector(5 downto 0); + +begin + +clock_6n <= not clock_6; +reset_n <= not reset; + +-- for debug +dbg_cpu_addr <= cpu_addr; + + +-- make pixels counters and cpu clock +-- in original hardware cpu clock = 1us = 6pixels +-- here one make 2 cpu clock within 1us +process (reset, clock_6n) +begin + if reset='1' then + pixel_cnt <= "000"; + cpu_clock <= '0'; + else + if rising_edge(clock_6n) then + + if pixel_cnt = "101" then + pixel_cnt <= "000"; + cpu_clock <= '0'; + else + pixel_cnt <= pixel_cnt + '1'; + end if; + + if pixel_cnt = "010" then + cpu_clock <= '1'; + end if; + + if pixel_cnt = "011" then -- speed up processor (two clocks / 1us) + cpu_clock <= '0'; + end if; + + if pixel_cnt = "100" then + cpu_clock <= '1'; + end if; + + + end if; + end if; +end process; + +-- make hcnt and vcnt video scanner from pixel clocks and counts +-- +-- pixels |0|1|2|3|4|5|0|1|2|3|4|5| +-- hcnt | N | N+1 | +-- +-- hcnt [0..63] => 64 x 6 = 384 pixels, 1 pixel is 1us => 1 line is 64us (15.625KHz) +-- vcnt [252..255,256..511] => 260 lines, 1 frame is 260 x 64us = 16.640ms (60.1Hz) +-- +process (reset, clock_6n) +begin + if reset='1' then + hcnt <= "000000"; + vcnt <= '0'&X"FC"; + else + if rising_edge(clock_6n) then + + if pixel_cnt = "101" then + hcnt <= hcnt + '1'; + if hcnt = "111111" then + if vcnt = '1'&X"FF" then + vcnt <= '0'&X"FC"; + else + vcnt <= vcnt + '1'; + end if; + end if; + end if; + + end if; + end if; +end process; + +-- rom address multiplexer +-- should reflect content of defender_prog.bin +-- +-- 4k 0000-0FFF cpu_space D000-DFFF defend.1 + defend.4 +-- 4k 1000-1FFF E000-EFFF defend.2 +-- 4k 2000-2FFF F000-FFFF defend.3 +-- 4k 3000-3FFF page=1 C000-CFFF defend.9 + defend.12 +-- 4k 4000-4FFF page=2 C000-CFFF defend.8 + defend.11 +-- 4k 5000-5FFF page=3 C000-CFFF defend.7 + defend.10 +-- 4k 6000-6FFF page=7 C000-C7FF defend.6 + 2k empty +-- 4k 7000-7FFF N.A 4k empty + +roms_addr <= + "011" & cpu_addr(11 downto 0) when cpu_addr(15 downto 12) = X"C" and rom_page = "001" else + "100" & cpu_addr(11 downto 0) when cpu_addr(15 downto 12) = X"C" and rom_page = "010" else + "101" & cpu_addr(11 downto 0) when cpu_addr(15 downto 12) = X"C" and rom_page = "011" else + "110" & cpu_addr(11 downto 0) when cpu_addr(15 downto 12) = X"C" and rom_page = "111" else + "000" & cpu_addr(11 downto 0) when cpu_addr(15 downto 12) = X"D" else + "001" & cpu_addr(11 downto 0) when cpu_addr(15 downto 12) = X"E" else + "010" & cpu_addr(11 downto 0) ;--when cpu_addr(15 downto 12) = X"F"; + +-- encoded cpu addr (decoder.2) and encoded scan addr (decoder.3) +-- and screen control for cocktail table flip +cpu_to_video_addr <= screen_ctrl & cpu_addr(15 downto 8); +video_scan_addr <= screen_ctrl & vcnt(7 downto 0); + +-- mux cpu addr/scan addr to wram +wram_addr <= + cpu_addr(7 downto 0) & cpu_to_video_do(5 downto 0) when cpu_clock = '1' else + video_scan_do & hcnt; + +-- mux cpu addr/pixels data to palette addr +palette_addr <= + cpu_addr(3 downto 0) when palette_we = '1' else + pixels(23 downto 20) when screen_ctrl = '0' else pixels(3 downto 0); + +-- only cpu can write to palette +palette_di <= cpu_do; + +-- palette output to colors bits +video_r <= palette_do(2 downto 0); +video_g <= palette_do(5 downto 3); +video_b <= palette_do(7 downto 6); + + +-- 24 bits pixels shift register +-- 6 pixels of 4 bits +process (clock_6) +begin + if rising_edge(clock_6) then + if screen_ctrl = '0' then + if pixel_cnt = "001" then + pixels <= wram0_do & wram1_do & wram2_do; + else + pixels <= pixels(19 downto 0) & X"0" ; + end if; + else + if pixel_cnt = "001" then + pixels <= wram2_do & wram1_do & wram0_do; + else + pixels <= X"0" & pixels(23 downto 4); + end if; + end if; + end if; +end process; + +-- pias cs +io_cs <= '1' when cpu_clock = '1' and cpu_addr(15 downto 12) = X"C" and rom_page ="000" else '0'; +pia_rom_cs <= '1' when io_cs = '1' and cpu_addr(11 downto 10) = "11" and cpu_addr(2) = '0' else '0'; -- CC00-CC03 +pia_io_cs <= '1' when io_cs = '1' and cpu_addr(11 downto 10) = "11" and cpu_addr(2) = '1' else '0'; -- CC04-CC07 + +-- write enables +wram_we <= '1' when cpu_rw = '0' and cpu_clock = '1' and cpu_addr(15 downto 12) < X"C" else '0'; +io_we <= '1' when cpu_rw = '0' and cpu_clock = '1' and cpu_addr(15 downto 12) = X"C" and rom_page ="000" else '0'; +rom_page_we <= '1' when cpu_rw = '0' and cpu_clock = '1' and cpu_addr(15 downto 12) = X"D" else '0'; + +palette_we <= '1' when io_we = '1' and cpu_addr(11 downto 10) = "00" and cpu_addr(4) = '0' else '0'; -- C000-C00F +screen_ctrl_we <= '1' when io_we = '1' and cpu_addr(11 downto 10) = "00" and cpu_addr(4) = '1' else '0'; -- C010-C01F +cmos_we <= '1' when io_we = '1' and cpu_addr(11 downto 10) = "01" else '0'; -- C400-C7FF +pia_rom_rw_n <= '0' when io_we = '1' and cpu_addr(11 downto 10) = "11" and cpu_addr(2) = '0' else '1'; -- CC00-CC03 +pia_io_rw_n <= '0' when io_we = '1' and cpu_addr(11 downto 10) = "11" and cpu_addr(2) = '1' else '1'; -- CC04-CC07 + +-- mux io data between cmos/video register/pias/c000_rom_page +roms_io_do <= + X"0"&cmos_do when rom_page = "000" and cpu_addr(11 downto 10) = "01" else -- C400-C7FF + vcnt(7 downto 2)&"00" when rom_page = "000" and cpu_addr(11 downto 10) = "10" else -- C800-cBFF + pia_rom_do when rom_page = "000" and cpu_addr(11 downto 10) = "11" and cpu_addr(2) = '0' else -- CC00-CC03 (A2n.A3n.A4n) + pia_io_do when rom_page = "000" and cpu_addr(11 downto 10) = "11" and cpu_addr(2) = '1' else -- CC04-CC07 (A2.A3n) + roms_do; + +-- mux cpu in data between roms/io/wram +cpu_di <= + roms_do when cpu_addr(15 downto 12) >= X"D" else + roms_io_do when cpu_addr(15 downto 12) >= X"C" else + wram0_do when cpu_to_video_do(7 downto 6) = "00" else + wram1_do when cpu_to_video_do(7 downto 6) = "01" else + wram2_do when cpu_to_video_do(7 downto 6) = "10" else X"00"; + + +-- dispatch cpu we to devices with respect to decoder2 bits 7-6 +wram0_we <= '1' when wram_we = '1' and cpu_to_video_do(7 downto 6) = "00" else '0'; +wram1_we <= '1' when wram_we = '1' and cpu_to_video_do(7 downto 6) = "01" else '0'; +wram2_we <= '1' when wram_we = '1' and cpu_to_video_do(7 downto 6) = "10" else '0'; + + +-- rom bank page (and IO) select register +-- screen control register +process (reset, clock_6) +begin + if reset='1' then + rom_page <= "000"; + screen_ctrl <= '0'; + else + if rising_edge(clock_6) then + if rom_page_we = '1' then rom_page <= cpu_do(2 downto 0); end if; + if screen_ctrl_we = '1' then screen_ctrl <= cpu_do(0); end if; + end if; + end if; +end process; + +-- pia rom board port a +-- bit 0 Auto Up / manual Down +-- bit 1 Advance +-- bit 2 Right Coin (nc) +-- bit 3 High Score Reset +-- bit 4 Left Coin +-- bit 5 Center Coin (nc) +-- bit 6 led 2 (output) +-- bit 7 led 1 (output) + +pias_clock <= clock_6; --not cpu_clock; + +pia_rom_pa_i(0) <= btn_auto_up; +pia_rom_pa_i(1) <= btn_advance; +pia_rom_pa_i(2) <= btn_service; +pia_rom_pa_i(3) <= '0'; +pia_rom_pa_i(4) <= btn_left_coin; +pia_rom_pa_i(5) <= '0'; +pia_rom_pa_i(6) <= '0'; +pia_rom_pa_i(7) <= '0'; + +-- pia io port a +-- bit 0 Fire +-- bit 1 Thrust +-- bit 2 Smart Bomb +-- bit 3 HyperSpace +-- bit 4 2 Players +-- bit 5 1 Player +-- bit 6 Reverse +-- bit 7 Down +--IN0 +pia_io_pa_i(0) <= btn_ffire; +pia_io_pa_i(1) <= btn_right; +pia_io_pa_i(2) <= btn_mayday; +pia_io_pa_i(3) <= btn_bfire; +pia_io_pa_i(4) <= btn_two_players; +pia_io_pa_i(5) <= btn_one_player; +pia_io_pa_i(6) <= '0'; +pia_io_pa_i(7) <= btn_down; + +-- pia io port b +-- bit 0 Up +-- bit 7 1 for coktail table, 0 for upright cabinet +-- other <= GND +pia_io_pb_i(0) <= btn_up; +pia_io_pb_i(6 downto 1) <= "000000"; +pia_io_pb_i(7) <= '0'; + +-- pia io ca/cb +--IN2 +cmd_select_players_btn <= pia_io_cb2_o; + +-- pia rom ca1/Cb1 +vcnt_240 <= '1' when vcnt(7 downto 4) = X"F" else '0'; +cnt_4ms <= vcnt(5); + +-- pia rom irqs to cpu +cpu_irq <= pia_rom_irqa or pia_rom_irqb; + +-- pia rom to sound board +select_sound <= pia_rom_pb_o(5 downto 0); + + +-- microprocessor 6809 +main_cpu : entity work.cpu09 +port map( + clk => cpu_clock,-- E clock input (falling edge) + rst => reset, -- reset input (active high) + vma => open, -- valid memory address (active high) + lic_out => open, -- last instruction cycle (active high) + ifetch => open, -- instruction fetch cycle (active high) + opfetch => open, -- opcode fetch (active high) + ba => open, -- bus available (high on sync wait or DMA grant) + bs => open, -- bus status (high on interrupt or reset vector fetch or DMA grant) + addr => cpu_a, -- address bus output + rw => cpu_rw, -- read not write output + data_out => cpu_do, -- data bus output + data_in => cpu_di, -- data bus input + irq => cpu_irq, -- interrupt request input (active high) + firq => '0', -- fast interrupt request input (active high) + nmi => '0', -- non maskable interrupt request input (active high) + halt => '0', -- halt input (active high) grants DMA + hold => '0' -- hold input (active high) extend bus cycle +); + +-- Mayday protection. +cpu_addr <= x"A193" when cpu_rw = '1' and cpu_a = x"A190" else + x"A194" when cpu_rw = '1' and cpu_a = x"A191" else + cpu_a; + +-- cpu program rom +-- 4k D000-DFFF +-- 4k E000-EFFF +-- 4k F000-FFFF +-- 4K C000-CFFF page=1 +-- 4K C000-CFFF page=2 +-- 4K C000-CFFF page=3 +-- 2K C000-C7FF page=7 +-- 6K N.A. + + +-- cpu/video wram 0 +cpu_video_ram0 : entity work.gen_ram +generic map( dWidth => 8, aWidth => 14) +port map( + clk => clock_6, + we => wram0_we, + addr => wram_addr(13 downto 0), + d => cpu_do, + q => wram0_do +); + +-- cpu/video wram 1 +cpu_video_ram1 : entity work.gen_ram +generic map( dWidth => 8, aWidth => 14) +port map( + clk => clock_6, + we => wram1_we, + addr => wram_addr(13 downto 0), + d => cpu_do, + q => wram1_do +); + +-- cpu/video wram 2 +cpu_video_ram2 : entity work.gen_ram +generic map( dWidth => 8, aWidth => 14) +port map( + clk => clock_6, + we => wram2_we, + addr => wram_addr(13 downto 0), + d => cpu_do, + q => wram2_do +); + +-- palette ram +palette_ram : entity work.gen_ram +generic map( dWidth => 8, aWidth => 4) +port map( + clk => clock_6, + we => palette_we, + addr => palette_addr, + d => palette_di, + q => palette_do +); + +-- cmos ram +cmos_ram : entity work.defender_cmos_ram +generic map( dWidth => 4, aWidth => 8) +port map( + clk => clock_6, + we => cmos_we, + addr => cpu_addr(7 downto 0), + d => cpu_do(3 downto 0), + q => cmos_do +); + +-- cpu to video addr decoder +cpu_video_addr_decoder : entity work.defender_decoder_2 +port map( + clk => clock_6, + addr => cpu_to_video_addr, + data => cpu_to_video_do +); + +-- video scan addr decoder +video_scan_addr_decoder : entity work.defender_decoder_3 +port map( + clk => clock_6, + addr => video_scan_addr, + data => video_scan_do +); + +-- pia i/O board +pia_io : entity work.pia6821 +port map +( + clk => pias_clock, -- rising edge + rst => reset, -- active high + cs => pia_io_cs, + rw => pia_io_rw_n, -- write low + addr => cpu_addr(1 downto 0), + data_in => cpu_do, + data_out => pia_io_do, + irqa => open, -- active high + irqb => open, -- active high + pa_i => pia_io_pa_i, + pa_o => open, + pa_oe => open, + ca1 => '0', + ca2_i => '0', + ca2_o => open, + ca2_oe => open, + pb_i => pia_io_pb_i, + pb_o => open, + pb_oe => open, + cb1 => '0', + cb2_i => '0', + cb2_o => pia_io_cb2_o, + cb2_oe => open +); + +-- pia rom board +pia_rom : entity work.pia6821 +port map +( + clk => pias_clock, + rst => reset, + cs => pia_rom_cs, + rw => pia_rom_rw_n, + addr => cpu_addr(1 downto 0), + data_in => cpu_do, + data_out => pia_rom_do, + irqa => pia_rom_irqa, + irqb => pia_rom_irqb, + pa_i => pia_rom_pa_i, + pa_o => open, + pa_oe => open, + ca1 => vcnt_240, + ca2_i => '0', + ca2_o => open, + ca2_oe => open, + pb_i => (others => '0'), + pb_o => pia_rom_pb_o, + pb_oe => open, + cb1 => cnt_4ms, + cb2_i => '0', + cb2_o => open, + cb2_oe => open +); + +-- video syncs and blanks +video_csync <= csync; + +process(clock_6n) + constant hcnt_base : integer := 54; + variable vsync_cnt : std_logic_vector(3 downto 0); +begin + +if rising_edge(clock_6n) then + + if hcnt = hcnt_base+0 then hsync0 <= '0'; + elsif hcnt = hcnt_base+6 then hsync0 <= '1'; + end if; + + if hcnt = hcnt_base+0 then hsync1 <= '0'; + elsif hcnt = hcnt_base+3 then hsync1 <= '1'; + elsif hcnt = hcnt_base+32-64 then hsync1 <= '0'; + elsif hcnt = hcnt_base+35-64 then hsync1 <= '1'; + end if; + + if hcnt = hcnt_base+0 then hsync2 <= '0'; + elsif hcnt = hcnt_base+32-3-64 then hsync2 <= '1'; + elsif hcnt = hcnt_base+32-64 then hsync2 <= '0'; + elsif hcnt = hcnt_base+64-3-128 then hsync2 <= '1'; + end if; + + if hcnt = 63 and pixel_cnt = 5 then + if vcnt = 495 then -- 503 with vcnt max = F4 + vsync_cnt := X"0"; -- 499 with F8, 495 with FC + else + if vsync_cnt < X"F" then vsync_cnt := vsync_cnt + '1'; end if; + end if; + end if; + + if vsync_cnt = 0 then csync <= hsync1; + elsif vsync_cnt = 1 then csync <= hsync1; + elsif vsync_cnt = 2 then csync <= hsync1; + elsif vsync_cnt = 3 then csync <= hsync2; + elsif vsync_cnt = 4 then csync <= hsync2; + elsif vsync_cnt = 5 then csync <= hsync2; + elsif vsync_cnt = 6 then csync <= hsync1; + elsif vsync_cnt = 7 then csync <= hsync1; + elsif vsync_cnt = 8 then csync <= hsync1; + else csync <= hsync0; + end if; + + if hcnt = hcnt_base-2 then hblank <= '1'; + elsif hcnt = hcnt_base+11-64 then hblank <= '0'; + end if; + + if vcnt = 492 then vblank <= '1'; -- 492 ok + elsif vcnt = 262 then vblank <= '0'; -- 262 ok + end if; + + -- external sync and blank outputs + video_blankn <= not (hblank or vblank); + + video_hs <= hsync0; + + if vsync_cnt = 0 then video_vs <= '0'; + elsif vsync_cnt = 8 then video_vs <= '1'; + end if; + +end if; +end process; + +-- sound board +defender_sound_board : entity work.defender_sound_board +port map( + clk_1p79 => clk_1p79, + clk_0p89 => clk_0p89, + reset => reset, + select_sound => select_sound, + audio_out => audio_out +); + +end struct; \ No newline at end of file diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_cmos_ram.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_cmos_ram.vhd new file mode 100644 index 00000000..f74b9b02 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_cmos_ram.vhd @@ -0,0 +1,163 @@ +-- ----------------------------------------------------------------------- +-- +-- Syntiac's generic VHDL support files. +-- +-- ----------------------------------------------------------------------- +-- Copyright 2005-2008 by Peter Wendrich (pwsoft@syntiac.com) +-- http://www.syntiac.com/fpga64.html +-- +-- Modified April 2016 by Dar (darfpga@aol.fr) +-- http://darfpga.blogspot.fr +-- Remove address register when writing +-- +-- Modifies Octiber 2017 by Dar +-- Add init data with defender cmos value +-- ----------------------------------------------------------------------- +-- +-- gen_rwram.vhd init with defender cmos value +-- +-- ----------------------------------------------------------------------- +-- +-- generic ram. +-- +-- ----------------------------------------------------------------------- + +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.numeric_std.ALL; + +-- ----------------------------------------------------------------------- + +entity defender_cmos_ram is + generic ( + dWidth : integer := 8; -- must be 4 for defender_cmos_ram + aWidth : integer := 10 -- must be 8 for defender_cmos_ram + ); + port ( + clk : in std_logic; + we : in std_logic; + addr : in std_logic_vector((aWidth-1) downto 0); + d : in std_logic_vector((dWidth-1) downto 0); + q : out std_logic_vector((dWidth-1) downto 0) + ); +end entity; + +-- ----------------------------------------------------------------------- +-- defender cmos data +-- (ram is 128x4 => only 4 bits/address, that is only 1 hex digit/address) +-- +-- @ values - (fonction) meaning + +-- 0 0 - ? +-- 1 0005 - (01) coins left +-- 5 0000 - (02) coins center +-- 9 0000 - (03) coins right +-- 13 0005 - (04) total paid +-- 17 0000 - (05) ships won +---21 0000 - (06) total time +-- 25 0003 - (07) total ships + +-- -- 8 entries of 6 digits highscore + 3 ascii letters + +-- 29 021270 44 52 4A +-- 41 018315 53 41 4D +-- 53 015920 4C 45 44 +-- 65 014285 50 47 44 +-- 77 012520 43 52 42 +-- 89 011035 4D 52 53 +-- 101 008265 53 53 52 +-- 113 006010 54 4D 48 + +-- 125 00 - credits +-- 127 5 - ? + +-- -- protected data writeable only with coin door opened + +-- 128 A - ? +-- 129 0100 - (08) bonus ship level +-- 133 03 - (09) nb ships +-- 135 03 - (10) coinage select +-- 137 01 - (11) left coin mult +-- 139 04 - (12) center coin mult +-- 141 01 - (13) right coin mult +-- 143 01 - (14) coins for credit +-- 145 00 - (15) coins for bonus +-- 147 00 - (16) minimum coins +-- 149 00 - (17) free play +-- 151 05 - (18) game adjust 1 Stating difficulty 0=lib; 1=mod; 2=cons +-- 153 15 - (19) game adjust 2 Progessive wave diff. limit > 4-25 +-- 155 01 - (20) game adjust 3 Background sound 0=off; 1=on +-- 157 05 - (21) game adjust 4 Planet restore wave number +-- 159 00 - (22) game adjust 5 +-- 161 00 - (23) game adjust 6 +-- 163 00 - (24) game adjust 7 +-- 165 00 - (25) game adjust 8 +-- 167 00 - (26) game adjust 9 +-- 169 00 - (27) game adjust 10 + +-- 171 00000 - ? +-- 176 0000000000000000 - ? +-- 192 0000000000000000 - ? +-- 208 0000000000000000 - ? +-- 224 0000000000000000 - ? +-- 240 0000000000000000 - ? + + +architecture rtl of defender_cmos_ram is + subtype addressRange is integer range 0 to ((2**aWidth)-1); + type ramDef is array(addressRange) of std_logic_vector((dWidth-1) downto 0); + + signal ram: ramDef := ( + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"2",X"1", + X"2",X"7",X"0",X"4",X"4",X"5",X"2",X"4",X"A",X"0",X"1",X"8",X"3",X"1",X"5",X"5", + X"3",X"4",X"1",X"4",X"D",X"0",X"1",X"5",X"9",X"2",X"0",X"4",X"C",X"4",X"5",X"4", + X"4",X"0",X"1",X"4",X"2",X"8",X"5",X"5",X"0",X"4",X"7",X"4",X"4",X"0",X"1",X"2", + X"5",X"2",X"0",X"4",X"3",X"5",X"2",X"4",X"2",X"0",X"1",X"1",X"0",X"3",X"5",X"4", + X"D",X"5",X"2",X"5",X"3",X"0",X"0",X"8",X"2",X"6",X"5",X"5",X"3",X"5",X"3",X"5", + X"2",X"0",X"0",X"6",X"0",X"1",X"0",X"5",X"4",X"4",X"D",X"4",X"8",X"0",X"0",X"5", + X"A",X"0",X"1",X"0",X"0",X"0",X"3",X"0",X"3",X"0",X"1",X"0",X"4",X"0",X"1",X"0", + X"1",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"5",X"1",X"5",X"0",X"1",X"0",X"5",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0", + X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0",X"0"); + + + signal rAddrReg : std_logic_vector((aWidth-1) downto 0); + signal qReg : std_logic_vector((dWidth-1) downto 0); +begin +-- ----------------------------------------------------------------------- +-- Signals to entity interface +-- ----------------------------------------------------------------------- +-- q <= qReg; + +-- ----------------------------------------------------------------------- +-- Memory write +-- ----------------------------------------------------------------------- + process(clk) + begin + if rising_edge(clk) then + if we = '1' then + ram(to_integer(unsigned(addr))) <= d; + end if; + end if; + end process; + +-- ----------------------------------------------------------------------- +-- Memory read +-- ----------------------------------------------------------------------- +process(clk) + begin + if rising_edge(clk) then +-- qReg <= ram(to_integer(unsigned(rAddrReg))); +-- rAddrReg <= addr; +---- qReg <= ram(to_integer(unsigned(addr))); + q <= ram(to_integer(unsigned(addr))); + end if; + end process; +--q <= ram(to_integer(unsigned(addr))); +end architecture; + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_decoder_2.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_decoder_2.vhd new file mode 100644 index 00000000..db3514d9 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_decoder_2.vhd @@ -0,0 +1,54 @@ +library ieee; +use ieee.std_logic_1164.all,ieee.numeric_std.all; + +entity defender_decoder_2 is +port ( + clk : in std_logic; + addr : in std_logic_vector(8 downto 0); + data : out std_logic_vector(7 downto 0) +); +end entity; + +architecture prom of defender_decoder_2 is + type rom is array(0 to 511) of std_logic_vector(7 downto 0); + signal rom_data: rom := ( + X"00",X"40",X"80",X"01",X"41",X"81",X"02",X"42",X"82",X"03",X"43",X"83",X"04",X"44",X"84",X"05", + X"45",X"85",X"06",X"46",X"86",X"07",X"47",X"87",X"08",X"48",X"88",X"09",X"49",X"89",X"0A",X"4A", + X"8A",X"0B",X"4B",X"8B",X"0C",X"4C",X"8C",X"0D",X"4D",X"8D",X"0E",X"4E",X"8E",X"0F",X"4F",X"8F", + X"10",X"50",X"90",X"11",X"51",X"91",X"12",X"52",X"92",X"13",X"53",X"93",X"14",X"54",X"94",X"15", + X"55",X"95",X"16",X"56",X"96",X"17",X"57",X"97",X"18",X"58",X"98",X"19",X"59",X"99",X"1A",X"5A", + X"9A",X"1B",X"5B",X"9B",X"1C",X"5C",X"9C",X"1D",X"5D",X"9D",X"1E",X"5E",X"9E",X"1F",X"5F",X"9F", + X"20",X"60",X"A0",X"21",X"61",X"A1",X"22",X"62",X"A2",X"23",X"63",X"A3",X"24",X"64",X"A4",X"25", + X"65",X"A5",X"26",X"66",X"A6",X"27",X"67",X"A7",X"28",X"68",X"A8",X"29",X"69",X"A9",X"2A",X"6A", + X"AA",X"2B",X"6B",X"AB",X"2C",X"6C",X"AC",X"2D",X"6D",X"AD",X"2E",X"6E",X"AE",X"2F",X"6F",X"AF", + X"30",X"70",X"B0",X"31",X"71",X"B1",X"32",X"72",X"B2",X"33",X"73",X"B3",X"34",X"74",X"B4",X"35", + X"75",X"B5",X"36",X"76",X"B6",X"37",X"77",X"B7",X"38",X"78",X"B8",X"39",X"79",X"B9",X"3A",X"7A", + X"BA",X"3B",X"7B",X"BB",X"3C",X"7C",X"BC",X"3D",X"7D",X"BD",X"3E",X"7E",X"BE",X"3F",X"7F",X"BF", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"40",X"80",X"01",X"41",X"72",X"32",X"B1",X"71",X"31",X"B0",X"70",X"30",X"AF",X"6F",X"2F", + X"AE",X"6E",X"2E",X"AD",X"6D",X"2D",X"AC",X"6C",X"2C",X"AB",X"6B",X"2B",X"AA",X"6A",X"2A",X"A9", + X"69",X"29",X"A8",X"68",X"28",X"A7",X"67",X"27",X"A6",X"66",X"26",X"A5",X"65",X"25",X"A4",X"64", + X"24",X"A3",X"63",X"23",X"A2",X"62",X"22",X"A1",X"61",X"21",X"A0",X"60",X"20",X"9F",X"5F",X"1F", + X"9E",X"5E",X"1E",X"9D",X"5D",X"1D",X"9C",X"5C",X"1C",X"9B",X"5B",X"1B",X"9A",X"5A",X"1A",X"99", + X"59",X"19",X"98",X"58",X"18",X"97",X"57",X"17",X"96",X"56",X"16",X"95",X"55",X"15",X"94",X"54", + X"14",X"93",X"53",X"13",X"92",X"52",X"12",X"91",X"51",X"11",X"90",X"50",X"10",X"8F",X"4F",X"0F", + X"8E",X"4E",X"0E",X"8D",X"4D",X"0D",X"8C",X"4C",X"0C",X"8B",X"4B",X"0B",X"8A",X"4A",X"0A",X"89", + X"49",X"09",X"88",X"48",X"08",X"87",X"47",X"07",X"86",X"46",X"06",X"85",X"45",X"05",X"84",X"44", + X"04",X"83",X"43",X"03",X"82",X"42",X"02",X"81",X"B2",X"33",X"73",X"B3",X"34",X"74",X"B4",X"35", + X"75",X"B5",X"36",X"76",X"B6",X"37",X"77",X"B7",X"38",X"78",X"B8",X"39",X"79",X"B9",X"3A",X"7A", + X"BA",X"3B",X"7B",X"BB",X"3C",X"7C",X"BC",X"3D",X"7D",X"BD",X"3E",X"7E",X"BE",X"3F",X"7F",X"BF", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00", + X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00",X"00"); +begin +process(clk) +begin + if rising_edge(clk) then + data <= rom_data(to_integer(unsigned(addr))); + end if; +end process; +end architecture; diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_decoder_3.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_decoder_3.vhd new file mode 100644 index 00000000..d5751938 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_decoder_3.vhd @@ -0,0 +1,54 @@ +library ieee; +use ieee.std_logic_1164.all,ieee.numeric_std.all; + +entity defender_decoder_3 is +port ( + clk : in std_logic; + addr : in std_logic_vector(8 downto 0); + data : out std_logic_vector(7 downto 0) +); +end entity; + +architecture prom of defender_decoder_3 is + type rom is array(0 to 511) of std_logic_vector(7 downto 0); + signal rom_data: rom := ( + X"00",X"01",X"02",X"03",X"04",X"05",X"06",X"07",X"08",X"09",X"0A",X"0B",X"0C",X"0D",X"0E",X"0F", + X"10",X"11",X"12",X"13",X"14",X"15",X"16",X"17",X"18",X"19",X"1A",X"1B",X"1C",X"1D",X"1E",X"1F", + X"20",X"21",X"22",X"23",X"24",X"25",X"26",X"27",X"28",X"29",X"2A",X"2B",X"2C",X"2D",X"2E",X"2F", + X"30",X"31",X"32",X"33",X"34",X"35",X"36",X"37",X"38",X"39",X"3A",X"3B",X"3C",X"3D",X"3E",X"3F", + X"40",X"41",X"42",X"43",X"44",X"45",X"46",X"47",X"48",X"49",X"4A",X"4B",X"4C",X"4D",X"4E",X"4F", + X"50",X"51",X"52",X"53",X"54",X"55",X"56",X"57",X"58",X"59",X"5A",X"5B",X"5C",X"5D",X"5E",X"5F", + X"60",X"61",X"62",X"63",X"64",X"65",X"66",X"67",X"68",X"69",X"6A",X"6B",X"6C",X"6D",X"6E",X"6F", + X"70",X"71",X"72",X"73",X"74",X"75",X"76",X"77",X"78",X"79",X"7A",X"7B",X"7C",X"7D",X"7E",X"7F", + X"80",X"81",X"82",X"83",X"84",X"85",X"86",X"87",X"88",X"89",X"8A",X"8B",X"8C",X"8D",X"8E",X"8F", + X"90",X"91",X"92",X"93",X"94",X"95",X"96",X"97",X"98",X"99",X"9A",X"9B",X"9C",X"9D",X"9E",X"9F", + X"A0",X"A1",X"A2",X"A3",X"A4",X"A5",X"A6",X"A7",X"A8",X"A9",X"AA",X"AB",X"AC",X"AD",X"AE",X"AF", + X"B0",X"B1",X"B2",X"B3",X"B4",X"B5",X"B6",X"B7",X"B8",X"B9",X"BA",X"BB",X"BC",X"BD",X"BE",X"BF", + X"C0",X"C1",X"C2",X"C3",X"C4",X"C5",X"C6",X"C7",X"C8",X"C9",X"CA",X"CB",X"CC",X"CD",X"CE",X"CF", + X"D0",X"D1",X"D2",X"D3",X"D4",X"D5",X"D6",X"D7",X"D8",X"D9",X"DA",X"DB",X"DC",X"DD",X"DE",X"DF", + X"E0",X"E1",X"E2",X"E3",X"E4",X"E5",X"E6",X"E7",X"E8",X"E9",X"EA",X"EB",X"EC",X"ED",X"EE",X"EF", + X"F0",X"F1",X"F2",X"F3",X"F4",X"F5",X"F6",X"F7",X"F8",X"F9",X"FA",X"FB",X"FC",X"FD",X"FE",X"FF", + X"FB",X"FA",X"F9",X"F8",X"F7",X"F6",X"F5",X"F4",X"F3",X"F2",X"F1",X"F0",X"EF",X"EE",X"ED",X"EC", + X"EB",X"EA",X"E9",X"E8",X"E7",X"E6",X"E5",X"E4",X"E3",X"E2",X"E1",X"E0",X"DF",X"DE",X"DD",X"DC", + X"DB",X"DA",X"D9",X"D8",X"D7",X"D6",X"D5",X"D4",X"D3",X"D2",X"D1",X"D0",X"CF",X"CE",X"CD",X"CC", + X"CB",X"CA",X"C9",X"C8",X"C7",X"C6",X"C5",X"C4",X"C3",X"C2",X"C1",X"C0",X"BF",X"BE",X"BD",X"BC", + X"BB",X"BA",X"B9",X"B8",X"B7",X"B6",X"B5",X"B4",X"B3",X"B2",X"B1",X"B0",X"AF",X"AE",X"AD",X"AC", + X"AB",X"AA",X"A9",X"A8",X"A7",X"A6",X"A5",X"A4",X"A3",X"A2",X"A1",X"A0",X"9F",X"9E",X"9D",X"9C", + X"9B",X"9A",X"99",X"98",X"97",X"96",X"95",X"94",X"93",X"92",X"91",X"90",X"8F",X"8E",X"8D",X"8C", + X"8B",X"8A",X"89",X"88",X"87",X"86",X"85",X"84",X"83",X"82",X"81",X"80",X"7F",X"7E",X"7D",X"7C", + X"7B",X"7A",X"79",X"78",X"77",X"76",X"75",X"74",X"73",X"72",X"71",X"70",X"6F",X"6E",X"6D",X"6C", + X"6B",X"6A",X"69",X"68",X"67",X"66",X"65",X"64",X"63",X"62",X"61",X"60",X"5F",X"5E",X"5D",X"5C", + X"5B",X"5A",X"59",X"58",X"57",X"56",X"55",X"54",X"53",X"52",X"51",X"50",X"4F",X"4E",X"4D",X"4C", + X"4B",X"4A",X"49",X"48",X"47",X"46",X"45",X"44",X"43",X"42",X"41",X"40",X"3F",X"3E",X"3D",X"3C", + X"3B",X"3A",X"39",X"38",X"37",X"36",X"35",X"34",X"33",X"32",X"31",X"30",X"2F",X"2E",X"2D",X"2C", + X"2B",X"2A",X"29",X"28",X"27",X"26",X"25",X"24",X"23",X"22",X"21",X"20",X"1F",X"1E",X"1D",X"1C", + X"1B",X"1A",X"19",X"18",X"17",X"16",X"15",X"14",X"13",X"12",X"11",X"10",X"0F",X"0E",X"0D",X"0C", + X"0B",X"0A",X"09",X"08",X"07",X"06",X"05",X"04",X"03",X"02",X"01",X"00",X"FC",X"FD",X"FE",X"FF"); +begin +process(clk) +begin + if rising_edge(clk) then + data <= rom_data(to_integer(unsigned(addr))); + end if; +end process; +end architecture; diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_sound.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_sound.vhd new file mode 100644 index 00000000..fc2af25c --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_sound.vhd @@ -0,0 +1,150 @@ +library ieee; +use ieee.std_logic_1164.all,ieee.numeric_std.all; + +entity defender_sound is +port ( + clk : in std_logic; + addr : in std_logic_vector(10 downto 0); + data : out std_logic_vector(7 downto 0) +); +end entity; + +architecture prom of defender_sound is + type rom is array(0 to 2047) of std_logic_vector(7 downto 0); + signal rom_data: rom := ( + X"FF",X"0F",X"8E",X"00",X"7F",X"CE",X"04",X"00",X"6F",X"01",X"6F",X"03",X"86",X"FF",X"A7",X"00", + X"6F",X"02",X"86",X"37",X"A7",X"03",X"86",X"3C",X"A7",X"01",X"97",X"09",X"4F",X"97",X"07",X"97", + X"04",X"97",X"05",X"97",X"06",X"97",X"08",X"0E",X"20",X"FE",X"16",X"48",X"48",X"48",X"1B",X"CE", + X"00",X"13",X"DF",X"0F",X"CE",X"FD",X"76",X"BD",X"FD",X"21",X"C6",X"09",X"7E",X"FB",X"0A",X"96", + X"1B",X"B7",X"04",X"00",X"96",X"13",X"97",X"1C",X"96",X"14",X"97",X"1D",X"DE",X"18",X"96",X"1C", + X"73",X"04",X"00",X"09",X"27",X"10",X"4A",X"26",X"FA",X"73",X"04",X"00",X"96",X"1D",X"09",X"27", + X"05",X"4A",X"26",X"FA",X"20",X"E8",X"B6",X"04",X"00",X"2B",X"01",X"43",X"8B",X"00",X"B7",X"04", + X"00",X"96",X"1C",X"9B",X"15",X"97",X"1C",X"96",X"1D",X"9B",X"16",X"97",X"1D",X"91",X"17",X"26", + X"CB",X"96",X"1A",X"27",X"06",X"9B",X"13",X"97",X"13",X"26",X"B9",X"39",X"86",X"01",X"97",X"1A", + X"C6",X"03",X"20",X"0A",X"86",X"FE",X"97",X"1A",X"86",X"C0",X"C6",X"10",X"20",X"00",X"97",X"19", + X"86",X"FF",X"B7",X"04",X"00",X"D7",X"15",X"D6",X"15",X"96",X"0A",X"44",X"44",X"44",X"98",X"0A", + X"44",X"76",X"00",X"09",X"76",X"00",X"0A",X"24",X"03",X"73",X"04",X"00",X"96",X"19",X"4A",X"26", + X"FD",X"5A",X"26",X"E5",X"96",X"19",X"9B",X"1A",X"97",X"19",X"26",X"DB",X"39",X"86",X"20",X"97", + X"15",X"97",X"18",X"86",X"01",X"CE",X"00",X"01",X"C6",X"FF",X"20",X"00",X"97",X"13",X"DF",X"16", + X"D7",X"14",X"D6",X"15",X"96",X"0A",X"44",X"44",X"44",X"98",X"0A",X"44",X"76",X"00",X"09",X"76", + X"00",X"0A",X"86",X"00",X"24",X"02",X"96",X"14",X"B7",X"04",X"00",X"DE",X"16",X"09",X"26",X"FD", + X"5A",X"26",X"E1",X"D6",X"14",X"D0",X"13",X"27",X"09",X"DE",X"16",X"08",X"96",X"18",X"27",X"D0", + X"20",X"CC",X"39",X"C6",X"01",X"D7",X"04",X"4F",X"97",X"19",X"20",X"14",X"4F",X"97",X"19",X"C6", + X"03",X"20",X"0D",X"86",X"01",X"97",X"19",X"CE",X"03",X"E8",X"86",X"01",X"C6",X"FF",X"20",X"00", + X"97",X"18",X"D7",X"13",X"DF",X"16",X"7F",X"00",X"15",X"DE",X"16",X"B6",X"04",X"00",X"16",X"54", + X"54",X"54",X"D8",X"0A",X"54",X"76",X"00",X"09",X"76",X"00",X"0A",X"D6",X"13",X"7D",X"00",X"19", + X"27",X"02",X"D4",X"09",X"D7",X"14",X"D6",X"15",X"91",X"0A",X"22",X"12",X"09",X"27",X"26",X"B7", + X"04",X"00",X"DB",X"15",X"99",X"14",X"25",X"16",X"91",X"0A",X"23",X"F0",X"20",X"10",X"09",X"27", + X"14",X"B7",X"04",X"00",X"D0",X"15",X"92",X"14",X"25",X"04",X"91",X"0A",X"22",X"F0",X"96",X"0A", + X"B7",X"04",X"00",X"20",X"B9",X"D6",X"18",X"27",X"B5",X"96",X"13",X"D6",X"15",X"44",X"56",X"44", + X"56",X"44",X"56",X"43",X"50",X"82",X"FF",X"DB",X"15",X"99",X"13",X"D7",X"15",X"97",X"13",X"26", + X"98",X"C1",X"07",X"26",X"94",X"39",X"86",X"FD",X"97",X"0F",X"CE",X"00",X"64",X"DF",X"0B",X"DB", + X"0C",X"96",X"11",X"99",X"0B",X"97",X"11",X"DE",X"0B",X"25",X"04",X"20",X"00",X"20",X"03",X"08", + X"27",X"11",X"DF",X"0B",X"84",X"0F",X"8B",X"9A",X"97",X"10",X"DE",X"0F",X"A6",X"00",X"B7",X"04", + X"00",X"20",X"DC",X"39",X"4F",X"B7",X"04",X"00",X"97",X"11",X"4F",X"91",X"11",X"26",X"03",X"73", + X"04",X"00",X"C6",X"12",X"5A",X"26",X"FD",X"4C",X"2A",X"F1",X"73",X"04",X"00",X"7C",X"00",X"11", + X"2A",X"E8",X"39",X"CE",X"00",X"13",X"6F",X"00",X"08",X"8C",X"00",X"1B",X"26",X"F8",X"86",X"40", + X"97",X"13",X"CE",X"00",X"13",X"86",X"80",X"97",X"11",X"5F",X"A6",X"01",X"AB",X"00",X"A7",X"01", + X"2A",X"02",X"DB",X"11",X"74",X"00",X"11",X"08",X"08",X"8C",X"00",X"1B",X"26",X"EC",X"F7",X"04", + X"00",X"7C",X"00",X"12",X"26",X"DC",X"CE",X"00",X"13",X"5F",X"A6",X"00",X"27",X"0B",X"81",X"37", + X"26",X"04",X"C6",X"41",X"E7",X"02",X"6A",X"00",X"5C",X"08",X"08",X"8C",X"00",X"1B",X"26",X"EA", + X"5D",X"26",X"BF",X"39",X"7A",X"00",X"08",X"39",X"7F",X"00",X"08",X"97",X"11",X"CE",X"FD",X"AA", + X"A6",X"00",X"27",X"2D",X"7A",X"00",X"11",X"27",X"06",X"4C",X"BD",X"FD",X"21",X"20",X"F1",X"08", + X"DF",X"0F",X"BD",X"FD",X"21",X"DF",X"0D",X"DE",X"0F",X"A6",X"00",X"97",X"15",X"A6",X"01",X"EE", + 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X"0F",X"A7",X"00",X"08",X"DF",X"0F",X"DE",X"0D",X"08",X"5A",X"26",X"EF",X"32",X"39",X"4F",X"97", + X"04",X"97",X"05",X"39",X"7F",X"00",X"04",X"96",X"05",X"84",X"7F",X"81",X"1D",X"26",X"01",X"4F", + X"4C",X"97",X"05",X"39",X"86",X"0E",X"BD",X"FB",X"81",X"96",X"05",X"48",X"48",X"43",X"BD",X"FC", + X"39",X"7C",X"00",X"17",X"BD",X"FC",X"3B",X"20",X"F8",X"86",X"03",X"BD",X"F8",X"2A",X"D6",X"06", + X"C1",X"1F",X"26",X"01",X"5F",X"5C",X"D7",X"06",X"86",X"20",X"10",X"5F",X"81",X"14",X"23",X"05", + X"CB",X"0E",X"4A",X"20",X"F7",X"CB",X"05",X"4A",X"26",X"FB",X"D7",X"13",X"BD",X"F8",X"3F",X"20", + X"FB",X"96",X"07",X"26",X"09",X"7C",X"00",X"07",X"86",X"0D",X"8D",X"05",X"20",X"69",X"7E",X"FC", + X"2E",X"16",X"58",X"1B",X"1B",X"1B",X"CE",X"FE",X"EC",X"BD",X"FD",X"21",X"A6",X"00",X"16",X"84", + X"0F",X"97",X"14",X"54",X"54",X"54",X"54",X"D7",X"13",X"A6",X"01",X"16",X"54",X"54",X"54",X"54", + X"D7",X"15",X"84",X"0F",X"97",X"11",X"DF",X"0B",X"CE",X"FE",X"4D",X"7A",X"00",X"11",X"2B",X"08", + X"A6",X"00",X"4C",X"BD",X"FD",X"21",X"20",X"F3",X"DF",X"18",X"BD",X"FC",X"75",X"DE",X"0B",X"A6", + X"02",X"97",X"1A",X"BD",X"FC",X"87",X"DE",X"0B",X"A6",X"03",X"97",X"16",X"A6",X"04",X"97",X"17", + X"A6",X"05",X"16",X"A6",X"06",X"CE",X"FF",X"55",X"BD",X"FD",X"21",X"17",X"DF",X"1B",X"7F",X"00", + X"23",X"BD",X"FD",X"21",X"DF",X"1D",X"39",X"96",X"13",X"97",X"22",X"DE",X"1B",X"DF",X"0D",X"DE", + X"0D",X"A6",X"00",X"9B",X"23",X"97",X"21",X"9C",X"1D",X"27",X"26",X"D6",X"14",X"08",X"DF",X"0D", + X"CE",X"00",X"24",X"96",X"21",X"4A",X"26",X"FD",X"A6",X"00",X"B7",X"04",X"00",X"08",X"9C",X"1F", + X"26",X"F1",X"5A",X"27",X"DA",X"08",X"09",X"08",X"09",X"08",X"09",X"08",X"09",X"01",X"01",X"20", + X"DF",X"96",X"15",X"8D",X"62",X"7A",X"00",X"22",X"26",X"C1",X"96",X"07",X"26",X"46",X"96",X"16", + X"27",X"42",X"7A",X"00",X"17",X"27",X"3D",X"9B",X"23",X"97",X"23",X"DE",X"1B",X"5F",X"96",X"23", + X"7D",X"00",X"16",X"2B",X"06",X"AB",X"00",X"25",X"08",X"20",X"0B",X"AB",X"00",X"27",X"02",X"25", + X"05",X"5D",X"27",X"08",X"20",X"0F",X"5D",X"26",X"03",X"DF",X"1B",X"5C",X"08",X"9C",X"1D",X"26", + X"DD",X"5D",X"26",X"01",X"39",X"DF",X"1D",X"96",X"15",X"27",X"06",X"8D",X"08",X"96",X"1A",X"8D", + X"16",X"7E",X"FB",X"E7",X"39",X"CE",X"00",X"24",X"DF",X"0F",X"DE",X"18",X"E6",X"00",X"08",X"BD", + X"FB",X"0A",X"DE",X"0F",X"DF",X"1F",X"39",X"4D",X"27",X"2B",X"DE",X"18",X"DF",X"0D",X"CE",X"00", + X"24",X"97",X"12",X"DF",X"0F",X"DE",X"0D",X"D6",X"12",X"D7",X"11",X"E6",X"01",X"54",X"54",X"54", + X"54",X"08",X"DF",X"0D",X"DE",X"0F",X"A6",X"00",X"10",X"7A",X"00",X"11",X"26",X"FA",X"A7",X"00", + X"08",X"9C",X"1F",X"26",X"DE",X"39",X"8E",X"00",X"7F",X"B6",X"04",X"02",X"0E",X"43",X"84",X"1F", + X"D6",X"08",X"27",X"09",X"2A",X"03",X"BD",X"FA",X"48",X"4A",X"BD",X"FA",X"89",X"5F",X"81",X"0E", + X"27",X"02",X"D7",X"06",X"81",X"12",X"27",X"02",X"D7",X"07",X"F6",X"EF",X"FD",X"C1",X"7E",X"26", + X"03",X"BD",X"EF",X"FD",X"4D",X"27",X"27",X"4A",X"81",X"0C",X"22",X"08",X"BD",X"FB",X"81",X"BD", + X"FB",X"E7",X"20",X"1A",X"81",X"1B",X"22",X"0E",X"80",X"0D",X"48",X"CE",X"FD",X"58",X"8D",X"21", + X"EE",X"00",X"AD",X"00",X"20",X"08",X"80",X"1C",X"BD",X"F8",X"2A",X"BD",X"F8",X"3F",X"96",X"04", + X"9A",X"05",X"27",X"FE",X"4F",X"97",X"07",X"96",X"04",X"27",X"03",X"7E",X"F9",X"13",X"7E",X"FB", + X"34",X"DF",X"0D",X"9B",X"0E",X"97",X"0E",X"24",X"03",X"7C",X"00",X"0D",X"DE",X"0D",X"39",X"0F", + X"8E",X"00",X"7F",X"CE",X"FF",X"FF",X"5F",X"E9",X"00",X"09",X"8C",X"F8",X"00",X"26",X"F8",X"E1", + X"00",X"27",X"01",X"3E",X"86",X"01",X"BD",X"F8",X"2A",X"BD",X"F8",X"3F",X"F6",X"EF",X"FA",X"C1", + X"7E",X"26",X"DC",X"BD",X"EF",X"FA",X"20",X"D7",X"FB",X"49",X"F9",X"13",X"FB",X"24",X"F8",X"8C", + X"FB",X"71",X"FB",X"1E",X"F8",X"CD",X"F8",X"94",X"F9",X"1C",X"F9",X"23",X"F9",X"A6",X"F9",X"D4", + X"F9",X"F3",X"FA",X"44",X"FA",X"84",X"40",X"01",X"00",X"10",X"E1",X"00",X"80",X"FF",X"FF",X"28", + X"01",X"00",X"08",X"81",X"02",X"00",X"FF",X"FF",X"28",X"81",X"00",X"FC",X"01",X"02",X"00",X"FC", + X"FF",X"FF",X"01",X"00",X"18",X"41",X"04",X"80",X"00",X"FF",X"8C",X"5B",X"B6",X"40",X"BF",X"49", + X"A4",X"73",X"73",X"A4",X"49",X"BF",X"40",X"B6",X"5B",X"8C",X"0C",X"7F",X"1D",X"0F",X"FB",X"7F", + X"23",X"0F",X"15",X"FE",X"08",X"50",X"8B",X"88",X"3E",X"3F",X"02",X"3E",X"7C",X"04",X"03",X"FF", + X"3E",X"3F",X"2C",X"E2",X"7C",X"12",X"0D",X"74",X"7C",X"0D",X"0E",X"41",X"7C",X"23",X"0B",X"50", + X"7C",X"1D",X"29",X"F2",X"7C",X"3F",X"02",X"3E",X"F8",X"04",X"03",X"FF",X"7C",X"3F",X"2C",X"E2", + X"F8",X"12",X"0D",X"74",X"F8",X"0D",X"0E",X"41",X"F8",X"23",X"0B",X"50",X"F8",X"1D",X"2F",X"F2", + X"F8",X"23",X"05",X"A8",X"F8",X"12",X"06",X"BA",X"F8",X"04",X"07",X"FF",X"7C",X"37",X"04",X"C1", + X"7C",X"23",X"05",X"A8",X"7C",X"12",X"06",X"BA",X"3E",X"04",X"07",X"FF",X"3E",X"37",X"04",X"C1", + X"3E",X"23",X"05",X"A8",X"1F",X"12",X"06",X"BA",X"1F",X"04",X"07",X"FF",X"1F",X"37",X"04",X"C1", + X"1F",X"23",X"16",X"A0",X"FE",X"1D",X"17",X"F9",X"7F",X"37",X"13",X"06",X"7F",X"3F",X"08",X"FA", + X"FE",X"04",X"0F",X"FF",X"FE",X"0D",X"0E",X"41",X"FE",X"23",X"0B",X"50",X"FE",X"1D",X"5F",X"E4", + X"00",X"47",X"3F",X"37",X"30",X"29",X"23",X"1D",X"17",X"12",X"0D",X"08",X"04",X"08",X"7F",X"D9", + X"FF",X"D9",X"7F",X"24",X"00",X"24",X"08",X"00",X"40",X"80",X"00",X"FF",X"00",X"80",X"40",X"10", + X"7F",X"B0",X"D9",X"F5",X"FF",X"F5",X"D9",X"B0",X"7F",X"4E",X"24",X"09",X"00",X"09",X"24",X"4E", + X"10",X"7F",X"C5",X"EC",X"E7",X"BF",X"8D",X"6D",X"6A",X"7F",X"94",X"92",X"71",X"40",X"17",X"12", + X"39",X"10",X"FF",X"FF",X"FF",X"FF",X"00",X"00",X"00",X"00",X"FF",X"FF",X"FF",X"FF",X"00",X"00", + X"00",X"00",X"48",X"8A",X"95",X"A0",X"AB",X"B5",X"BF",X"C8",X"D1",X"DA",X"E1",X"E8",X"EE",X"F3", + X"F7",X"FB",X"FD",X"FE",X"FF",X"FE",X"FD",X"FB",X"F7",X"F3",X"EE",X"E8",X"E1",X"DA",X"D1",X"C8", + X"BF",X"B5",X"AB",X"A0",X"95",X"8A",X"7F",X"75",X"6A",X"5F",X"54",X"4A",X"40",X"37",X"2E",X"25", + X"1E",X"17",X"11",X"0C",X"08",X"04",X"02",X"01",X"00",X"01",X"02",X"04",X"08",X"0C",X"11",X"17", + X"1E",X"25",X"2E",X"37",X"40",X"4A",X"54",X"5F",X"6A",X"75",X"7F",X"10",X"59",X"7B",X"98",X"AC", + X"B3",X"AC",X"98",X"7B",X"59",X"37",X"19",X"06",X"00",X"06",X"19",X"37",X"81",X"24",X"00",X"00", + X"00",X"16",X"31",X"12",X"05",X"1A",X"FF",X"00",X"27",X"6D",X"11",X"05",X"11",X"01",X"0F",X"01", + X"47",X"11",X"31",X"00",X"01",X"00",X"0D",X"1B",X"F4",X"12",X"00",X"00",X"00",X"14",X"47",X"41", + X"45",X"00",X"00",X"00",X"0F",X"5B",X"21",X"35",X"11",X"FF",X"00",X"0D",X"1B",X"15",X"00",X"00", + X"FD",X"00",X"01",X"69",X"31",X"11",X"00",X"01",X"00",X"03",X"6A",X"01",X"15",X"01",X"01",X"01", + X"01",X"47",X"F6",X"53",X"03",X"00",X"02",X"06",X"94",X"6A",X"10",X"02",X"00",X"02",X"06",X"9A", + X"1F",X"12",X"00",X"FF",X"10",X"04",X"69",X"31",X"11",X"00",X"FF",X"00",X"0D",X"00",X"12",X"06", + X"00",X"FF",X"01",X"09",X"28",X"A0",X"98",X"90",X"88",X"80",X"78",X"70",X"68",X"60",X"58",X"50", + X"44",X"40",X"01",X"01",X"02",X"02",X"04",X"04",X"08",X"08",X"10",X"10",X"30",X"60",X"C0",X"E0", + X"01",X"01",X"02",X"02",X"03",X"04",X"05",X"06",X"07",X"08",X"09",X"0A",X"0C",X"80",X"7C",X"78", + X"74",X"70",X"74",X"78",X"7C",X"80",X"01",X"01",X"02",X"02",X"04",X"04",X"08",X"08",X"10",X"20", + X"28",X"30",X"38",X"40",X"48",X"50",X"60",X"70",X"80",X"A0",X"B0",X"C0",X"08",X"40",X"08",X"40", + X"08",X"40",X"08",X"40",X"08",X"40",X"08",X"40",X"08",X"40",X"08",X"40",X"08",X"40",X"08",X"40", + X"01",X"02",X"04",X"08",X"09",X"0A",X"0B",X"0C",X"0E",X"0F",X"10",X"12",X"14",X"16",X"40",X"10", + X"08",X"01",X"01",X"01",X"01",X"01",X"02",X"02",X"03",X"03",X"04",X"04",X"05",X"06",X"08",X"0A", + X"0C",X"10",X"14",X"18",X"20",X"30",X"40",X"50",X"40",X"30",X"20",X"10",X"0C",X"0A",X"08",X"07", + X"06",X"05",X"04",X"03",X"02",X"02",X"01",X"01",X"01",X"07",X"08",X"09",X"0A",X"0C",X"08",X"17", + X"18",X"19",X"1A",X"1B",X"1C",X"00",X"00",X"00",X"FC",X"B6",X"F8",X"01",X"FD",X"2F",X"F8",X"01"); +begin +process(clk) +begin + if rising_edge(clk) then + data <= rom_data(to_integer(unsigned(addr))); + end if; +end process; +end architecture; diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_sound_board.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_sound_board.vhd new file mode 100644 index 00000000..5fdd8293 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/defender_sound_board.vhd @@ -0,0 +1,186 @@ +--------------------------------------------------------------------------------- +-- Defender sound board by Dar (darfpga@aol.fr) +-- http://darfpga.blogspot.fr +--------------------------------------------------------------------------------- +-- gen_ram.vhd +-------------------------------- +-- Copyright 2005-2008 by Peter Wendrich (pwsoft@syntiac.com) +-- http://www.syntiac.com/fpga64.html +--------------------------------------------------------------------------------- +-- cpu68 - Version 9th Jan 2004 0.8 +-- 6800/01 compatible CPU core +-- GNU public license - December 2002 : John E. Kent +--------------------------------------------------------------------------------- +-- Educational use only +-- Do not redistribute synthetized file with roms +-- Do not redistribute roms whatever the form +-- Use at your own risk +--------------------------------------------------------------------------------- +-- Version 0.0 -- 15/10/2017 -- +-- initial version +--------------------------------------------------------------------------------- + +library ieee; +use ieee.std_logic_1164.all; +use ieee.std_logic_unsigned.all; +use ieee.numeric_std.all; + +entity defender_sound_board is +port( + clk_1p79 : in std_logic; + clk_0p89 : in std_logic; + reset : in std_logic; + + select_sound : in std_logic_vector(5 downto 0); + audio_out : out std_logic_vector( 7 downto 0); + + dbg_cpu_addr : out std_logic_vector(15 downto 0) +); +end defender_sound_board; + +architecture struct of defender_sound_board is + + signal reset_n : std_logic; + + signal cpu_clock : std_logic; + signal cpu_addr : std_logic_vector(15 downto 0); + signal cpu_di : std_logic_vector( 7 downto 0); + signal cpu_do : std_logic_vector( 7 downto 0); + signal cpu_rw : std_logic; + signal cpu_irq : std_logic; + + signal wram_cs : std_logic; + signal wram_we : std_logic; + signal wram_do : std_logic_vector( 7 downto 0); + + signal rom_cs : std_logic; + signal rom_do : std_logic_vector( 7 downto 0); + +-- pia port a +-- bit 0-7 audio output + +-- pia port b +-- bit 0-4 select sound input (sel0-4) +-- bit 5-6 switch sound/notes/speech on/off +-- bit 7 sel5 + +-- pia io ca/cb +-- ca1 vdd +-- cb1 sound trigger (sel0-5 = 1) +-- ca2 speech data N/C +-- cb2 speech clock N/C + + signal pia_clock : std_logic; + signal pia_rw_n : std_logic; + signal pia_cs : std_logic; + signal pia_irqa : std_logic; + signal pia_irqb : std_logic; + signal pia_do : std_logic_vector( 7 downto 0); + signal pia_pa_o : std_logic_vector( 7 downto 0); + signal pia_pb_i : std_logic_vector( 7 downto 0); + signal pia_cb1_i : std_logic; + +begin + +reset_n <= not reset; + +dbg_cpu_addr <= cpu_addr; +cpu_clock <= clk_0p89; + + +-- pia cs +wram_cs <= '1' when cpu_addr(15 downto 8) = X"00" else '0'; -- 0000-007F +pia_cs <= '1' when cpu_addr(15 downto 12) = X"0" and cpu_addr(10) = '1' else '0'; -- 8400-8403 ? => 0400-0403 +rom_cs <= '1' when cpu_addr(15 downto 12) = X"F" else '0'; -- F800-FFFF + +-- write enables +wram_we <= '1' when cpu_rw = '0' and cpu_clock = '1' and wram_cs = '1' else '0'; +pia_rw_n <= '0' when cpu_rw = '0' and cpu_clock = '1' and pia_cs = '1' else '1'; + +-- mux cpu in data between roms/io/wram +cpu_di <= + wram_do when wram_cs = '1' else + pia_do when pia_cs = '1' else + rom_do when rom_cs = '1' else X"55"; + +-- pia I/O +pia_clock <= clk_1p79; -- 3p58/2 +audio_out <= pia_pa_o; + +pia_pb_i(4 downto 0) <= select_sound(4 downto 0); +pia_pb_i(6 downto 5) <= "11"; -- assume DS1-1 and DS1-2 open +pia_pb_i(7) <= '1'; -- Handshake to ? from rom board (drawings are confusing) + +-- pia Cb1 +pia_cb1_i <= '0' when select_sound = "111111" else '1'; + +-- pia irqs to cpu +cpu_irq <= pia_irqa or pia_irqb; + +-- microprocessor 6800 +main_cpu : entity work.cpu68 +port map( + clk => cpu_clock,-- E clock input (falling edge) + rst => reset, -- reset input (active high) + rw => cpu_rw, -- read not write output + vma => open, -- valid memory address (active high) + address => cpu_addr, -- address bus output + data_in => cpu_di, -- data bus input + data_out => cpu_do, -- data bus output + hold => '0', -- hold input (active high) extend bus cycle + halt => '0', -- halt input (active high) grants DMA + irq => cpu_irq, -- interrupt request input (active high) + nmi => '0', -- non maskable interrupt request input (active high) + test_alu => open, + test_cc => open +); + +-- cpu program rom +cpu_prog_rom : entity work.defender_sound +port map( + clk => clk_1p79, + addr => cpu_addr(10 downto 0), + data => rom_do +); + +-- cpu wram +cpu_ram : entity work.gen_ram +generic map( dWidth => 8, aWidth => 7) +port map( + clk => clk_1p79, + we => wram_we, + addr => cpu_addr(6 downto 0), + d => cpu_do, + q => wram_do +); + +-- pia +pia : entity work.pia6821 +port map +( + clk => clk_1p79, + rst => reset, + cs => pia_cs, + rw => pia_rw_n, + addr => cpu_addr(1 downto 0), + data_in => cpu_do, + data_out => pia_do, + irqa => pia_irqa, + irqb => pia_irqb, + pa_i => (others => '0'), + pa_o => pia_pa_o, + pa_oe => open, + ca1 => '1', + ca2_i => '0', + ca2_o => open, + ca2_oe => open, + pb_i => pia_pb_i, + pb_o => open, + pb_oe => open, + cb1 => pia_cb1_i, + cb2_i => '0', + cb2_o => open, + cb2_oe => open +); + +end struct; \ No newline at end of file diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/gen_ram.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/gen_ram.vhd new file mode 100644 index 00000000..f1a95608 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/gen_ram.vhd @@ -0,0 +1,84 @@ +-- ----------------------------------------------------------------------- +-- +-- Syntiac's generic VHDL support files. +-- +-- ----------------------------------------------------------------------- +-- Copyright 2005-2008 by Peter Wendrich (pwsoft@syntiac.com) +-- http://www.syntiac.com/fpga64.html +-- +-- Modified April 2016 by Dar (darfpga@aol.fr) +-- http://darfpga.blogspot.fr +-- Remove address register when writing +-- +-- ----------------------------------------------------------------------- +-- +-- gen_rwram.vhd +-- +-- ----------------------------------------------------------------------- +-- +-- generic ram. +-- +-- ----------------------------------------------------------------------- + +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.numeric_std.ALL; + +-- ----------------------------------------------------------------------- + +entity gen_ram is + generic ( + dWidth : integer := 8; + aWidth : integer := 10 + ); + port ( + clk : in std_logic; + we : in std_logic; + addr : in std_logic_vector((aWidth-1) downto 0); + d : in std_logic_vector((dWidth-1) downto 0); + q : out std_logic_vector((dWidth-1) downto 0) + ); +end entity; + +-- ----------------------------------------------------------------------- + +architecture rtl of gen_ram is + subtype addressRange is integer range 0 to ((2**aWidth)-1); + type ramDef is array(addressRange) of std_logic_vector((dWidth-1) downto 0); + signal ram: ramDef; + + signal rAddrReg : std_logic_vector((aWidth-1) downto 0); + signal qReg : std_logic_vector((dWidth-1) downto 0); +begin +-- ----------------------------------------------------------------------- +-- Signals to entity interface +-- ----------------------------------------------------------------------- +-- q <= qReg; + +-- ----------------------------------------------------------------------- +-- Memory write +-- ----------------------------------------------------------------------- + process(clk) + begin + if rising_edge(clk) then + if we = '1' then + ram(to_integer(unsigned(addr))) <= d; + end if; + end if; + end process; + +-- ----------------------------------------------------------------------- +-- Memory read +-- ----------------------------------------------------------------------- +process(clk) + begin + if rising_edge(clk) then +-- qReg <= ram(to_integer(unsigned(rAddrReg))); +-- rAddrReg <= addr; +---- qReg <= ram(to_integer(unsigned(addr))); + q <= ram(to_integer(unsigned(addr))); + end if; + end process; +--q <= ram(to_integer(unsigned(addr))); +end architecture; + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pia6821.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pia6821.vhd new file mode 100644 index 00000000..d565ae36 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pia6821.vhd @@ -0,0 +1,553 @@ +--===========================================================================-- +-- +-- S Y N T H E Z I A B L E I/O Port C O R E +-- +-- www.OpenCores.Org - May 2004 +-- This core adheres to the GNU public license +-- +-- File name : pia6821.vhd +-- +-- Purpose : Implements 2 x 8 bit parallel I/O ports +-- with programmable data direction registers +-- +-- Dependencies : ieee.Std_Logic_1164 +-- ieee.std_logic_unsigned +-- +-- Author : John E. Kent +-- +--===========================================================================---- +-- +-- Revision History: +-- +-- Date: Revision Author +-- 1 May 2004 0.0 John Kent +-- Initial version developed from ioport.vhd +-- +-- +-- Unkown date 0.0.1 found at Pacedev repository +-- remove High Z output and and oe signal +-- +-- 18 October 2017 0.0.2 DarFpga +-- Set output to low level when in data is in input mode +-- (to avoid infered latch warning) +-- +--===========================================================================---- +-- +-- Memory Map +-- +-- IO + $00 - Port A Data & Direction register +-- IO + $01 - Port A Control register +-- IO + $02 - Port B Data & Direction Direction Register +-- IO + $03 - Port B Control Register +-- + +library ieee; +use ieee.std_logic_1164.all; +use ieee.std_logic_unsigned.all; + +entity pia6821 is + port ( + clk : in std_logic; + rst : in std_logic; + cs : in std_logic; + rw : in std_logic; + addr : in std_logic_vector(1 downto 0); + data_in : in std_logic_vector(7 downto 0); + data_out : out std_logic_vector(7 downto 0); + irqa : out std_logic; + irqb : out std_logic; + pa_i : in std_logic_vector(7 downto 0); + pa_o : out std_logic_vector(7 downto 0); + pa_oe : out std_logic_vector(7 downto 0); + ca1 : in std_logic; + ca2_i : in std_logic; + ca2_o : out std_logic; + ca2_oe : out std_logic; + pb_i : in std_logic_vector(7 downto 0); + pb_o : out std_logic_vector(7 downto 0); + pb_oe : out std_logic_vector(7 downto 0); + cb1 : in std_logic; + cb2_i : in std_logic; + cb2_o : out std_logic; + cb2_oe : out std_logic + ); +end; + +architecture pia_arch of pia6821 is + +signal porta_ddr : std_logic_vector(7 downto 0); +signal porta_data : std_logic_vector(7 downto 0); +signal porta_ctrl : std_logic_vector(5 downto 0); +signal porta_read : std_logic; + +signal portb_ddr : std_logic_vector(7 downto 0); +signal portb_data : std_logic_vector(7 downto 0); +signal portb_ctrl : std_logic_vector(5 downto 0); +signal portb_read : std_logic; +signal portb_write : std_logic; + +signal ca1_del : std_logic; +signal ca1_rise : std_logic; +signal ca1_fall : std_logic; +signal ca1_edge : std_logic; +signal irqa1 : std_logic; + +signal ca2_del : std_logic; +signal ca2_rise : std_logic; +signal ca2_fall : std_logic; +signal ca2_edge : std_logic; +signal irqa2 : std_logic; +signal ca2_out : std_logic; + +signal cb1_del : std_logic; +signal cb1_rise : std_logic; +signal cb1_fall : std_logic; +signal cb1_edge : std_logic; +signal irqb1 : std_logic; + +signal cb2_del : std_logic; +signal cb2_rise : std_logic; +signal cb2_fall : std_logic; +signal cb2_edge : std_logic; +signal irqb2 : std_logic; +signal cb2_out : std_logic; + +begin + +-------------------------------- +-- +-- read I/O port +-- +-------------------------------- + +pia_read : process( addr, cs, + irqa1, irqa2, irqb1, irqb2, + porta_ddr, portb_ddr, + porta_data, portb_data, + porta_ctrl, portb_ctrl, + pa_i, pb_i ) +variable count : integer; +begin + case addr is + when "00" => + for count in 0 to 7 loop + if porta_ctrl(2) = '0' then + data_out(count) <= porta_ddr(count); + porta_read <= '0'; + else + if porta_ddr(count) = '1' then + data_out(count) <= porta_data(count); + else + data_out(count) <= pa_i(count); + end if; + porta_read <= cs; + end if; + end loop; + portb_read <= '0'; + + when "01" => + data_out <= irqa1 & irqa2 & porta_ctrl; + porta_read <= '0'; + portb_read <= '0'; + + when "10" => + for count in 0 to 7 loop + if portb_ctrl(2) = '0' then + data_out(count) <= portb_ddr(count); + portb_read <= '0'; + else + if portb_ddr(count) = '1' then + data_out(count) <= portb_data(count); + else + data_out(count) <= pb_i(count); + end if; + portb_read <= cs; + end if; + end loop; + porta_read <= '0'; + + when "11" => + data_out <= irqb1 & irqb2 & portb_ctrl; + porta_read <= '0'; + portb_read <= '0'; + + when others => + data_out <= "00000000"; + porta_read <= '0'; + portb_read <= '0'; + + end case; +end process; + +--------------------------------- +-- +-- Write I/O ports +-- +--------------------------------- + +pia_write : process( clk, rst, addr, cs, rw, data_in, + porta_ctrl, portb_ctrl, + porta_data, portb_data, + porta_ddr, portb_ddr ) +begin + if rst = '1' then + porta_ddr <= "00000000"; + porta_data <= "00000000"; + porta_ctrl <= "000000"; + portb_ddr <= "00000000"; + portb_data <= "00000000"; + portb_ctrl <= "000000"; + portb_write <= '0'; + elsif clk'event and clk = '1' then + if cs = '1' and rw = '0' then + case addr is + when "00" => + if porta_ctrl(2) = '0' then + porta_ddr <= data_in; + porta_data <= porta_data; + else + porta_ddr <= porta_ddr; + porta_data <= data_in; + end if; + porta_ctrl <= porta_ctrl; + portb_ddr <= portb_ddr; + portb_data <= portb_data; + portb_ctrl <= portb_ctrl; + portb_write <= '0'; + when "01" => + porta_ddr <= porta_ddr; + porta_data <= porta_data; + porta_ctrl <= data_in(5 downto 0); + portb_ddr <= portb_ddr; + portb_data <= portb_data; + portb_ctrl <= portb_ctrl; + portb_write <= '0'; + when "10" => + porta_ddr <= porta_ddr; + porta_data <= porta_data; + porta_ctrl <= porta_ctrl; + if portb_ctrl(2) = '0' then + portb_ddr <= data_in; + portb_data <= portb_data; + portb_write <= '0'; + else + portb_ddr <= portb_ddr; + portb_data <= data_in; + portb_write <= '1'; + end if; + portb_ctrl <= portb_ctrl; + when "11" => + porta_ddr <= porta_ddr; + porta_data <= porta_data; + porta_ctrl <= porta_ctrl; + portb_ddr <= portb_ddr; + portb_data <= portb_data; + portb_ctrl <= data_in(5 downto 0); + portb_write <= '0'; + when others => + porta_ddr <= porta_ddr; + porta_data <= porta_data; + porta_ctrl <= porta_ctrl; + portb_ddr <= portb_ddr; + portb_data <= portb_data; + portb_ctrl <= portb_ctrl; + portb_write <= '0'; + end case; + else + porta_ddr <= porta_ddr; + porta_data <= porta_data; + porta_ctrl <= porta_ctrl; + portb_data <= portb_data; + portb_ddr <= portb_ddr; + portb_ctrl <= portb_ctrl; + portb_write <= '0'; + end if; + end if; +end process; + +--------------------------------- +-- +-- direction control port a +-- +--------------------------------- +porta_direction : process ( porta_data, porta_ddr ) +variable count : integer; +begin + for count in 0 to 7 loop + if porta_ddr(count) = '1' then + pa_o(count) <= porta_data(count); + pa_oe(count) <= '1'; + else + pa_o(count) <= '0'; + pa_oe(count) <= '0'; + end if; + end loop; +end process; + +--------------------------------- +-- +-- CA1 Edge detect +-- +--------------------------------- +ca1_input : process( clk, rst, ca1, ca1_del, + ca1_rise, ca1_fall, ca1_edge, + irqa1, porta_ctrl, porta_read ) +begin + if rst = '1' then + ca1_del <= '0'; + ca1_rise <= '0'; + ca1_fall <= '0'; + ca1_edge <= '0'; + irqa1 <= '0'; + elsif clk'event and clk = '0' then + ca1_del <= ca1; + ca1_rise <= (not ca1_del) and ca1; + ca1_fall <= ca1_del and (not ca1); + if ca1_edge = '1' then + irqa1 <= '1'; + elsif porta_read = '1' then + irqa1 <= '0'; + else + irqa1 <= irqa1; + end if; + end if; + + if porta_ctrl(1) = '0' then + ca1_edge <= ca1_fall; + else + ca1_edge <= ca1_rise; + end if; +end process; + +--------------------------------- +-- +-- CA2 Edge detect +-- +--------------------------------- +ca2_input : process( clk, rst, ca2_i, ca2_del, + ca2_rise, ca2_fall, ca2_edge, + irqa2, porta_ctrl, porta_read ) +begin + if rst = '1' then + ca2_del <= '0'; + ca2_rise <= '0'; + ca2_fall <= '0'; + ca2_edge <= '0'; + irqa2 <= '0'; + elsif clk'event and clk = '0' then + ca2_del <= ca2_i; + ca2_rise <= (not ca2_del) and ca2_i; + ca2_fall <= ca2_del and (not ca2_i); + if porta_ctrl(5) = '0' and ca2_edge = '1' then + irqa2 <= '1'; + elsif porta_read = '1' then + irqa2 <= '0'; + else + irqa2 <= irqa2; + end if; + end if; + + if porta_ctrl(4) = '0' then + ca2_edge <= ca2_fall; + else + ca2_edge <= ca2_rise; + end if; +end process; + +--------------------------------- +-- +-- CA2 output control +-- +--------------------------------- +ca2_output : process( clk, rst, porta_ctrl, porta_read, ca1_edge, ca2_out ) +begin + if rst='1' then + ca2_out <= '0'; + elsif clk'event and clk='0' then + case porta_ctrl(5 downto 3) is + when "100" => -- read PA clears, CA1 edge sets + if porta_read = '1' then + ca2_out <= '0'; + elsif ca1_edge = '1' then + ca2_out <= '1'; + else + ca2_out <= ca2_out; + end if; + when "101" => -- read PA clears, E sets + ca2_out <= not porta_read; + when "110" => -- set low + ca2_out <= '0'; + when "111" => -- set high + ca2_out <= '1'; + when others => -- no change + ca2_out <= ca2_out; + end case; + end if; +end process; + +--------------------------------- +-- +-- CA2 direction control +-- +--------------------------------- +ca2_direction : process( porta_ctrl, ca2_out ) +begin + if porta_ctrl(5) = '0' then + ca2_oe <= '0'; + ca2_o <= '0'; + else + ca2_o <= ca2_out; + ca2_oe <= '1'; + end if; +end process; + +--------------------------------- +-- +-- direction control port b +-- +--------------------------------- +portb_direction : process ( portb_data, portb_ddr ) +variable count : integer; +begin + for count in 0 to 7 loop + if portb_ddr(count) = '1' then + pb_o(count) <= portb_data(count); + pb_oe(count) <= '1'; + else + pb_o(count) <= '0'; + pb_oe(count) <= '0'; + end if; + end loop; +end process; + +--------------------------------- +-- +-- CB1 Edge detect +-- +--------------------------------- +cb1_input : process( clk, rst, cb1, cb1_del, + cb1_rise, cb1_fall, cb1_edge, + irqb1, portb_ctrl, portb_read ) +begin + if rst = '1' then + cb1_del <= '0'; + cb1_rise <= '0'; + cb1_fall <= '0'; + cb1_edge <= '0'; + irqb1 <= '0'; + elsif clk'event and clk = '0' then + cb1_del <= cb1; + cb1_rise <= (not cb1_del) and cb1; + cb1_fall <= cb1_del and (not cb1); + if cb1_edge = '1' then + irqb1 <= '1'; + elsif portb_read = '1' then + irqb1 <= '0'; + else + irqb1 <= irqb1; + end if; + end if; + + if portb_ctrl(1) = '0' then + cb1_edge <= cb1_fall; + else + cb1_edge <= cb1_rise; + end if; +end process; + +--------------------------------- +-- +-- CB2 Edge detect +-- +--------------------------------- +cb2_input : process( clk, rst, cb2_i, cb2_del, + cb2_rise, cb2_fall, cb2_edge, + irqb2, portb_ctrl, portb_read ) +begin + if rst = '1' then + cb2_del <= '0'; + cb2_rise <= '0'; + cb2_fall <= '0'; + cb2_edge <= '0'; + irqb2 <= '0'; + elsif clk'event and clk = '0' then + cb2_del <= cb2_i; + cb2_rise <= (not cb2_del) and cb2_i; + cb2_fall <= cb2_del and (not cb2_i); + if portb_ctrl(5) = '0' and cb2_edge = '1' then + irqb2 <= '1'; + elsif portb_read = '1' then + irqb2 <= '0'; + else + irqb2 <= irqb2; + end if; + end if; + + if portb_ctrl(4) = '0' then + cb2_edge <= cb2_fall; + else + cb2_edge <= cb2_rise; + end if; + +end process; + +--------------------------------- +-- +-- CB2 output control +-- +--------------------------------- +cb2_output : process( clk, rst, portb_ctrl, portb_write, cb1_edge, cb2_out ) +begin + if rst='1' then + cb2_out <= '0'; + elsif clk'event and clk='0' then + case portb_ctrl(5 downto 3) is + when "100" => -- write PB clears, CA1 edge sets + if portb_write = '1' then + cb2_out <= '0'; + elsif cb1_edge = '1' then + cb2_out <= '1'; + else + cb2_out <= cb2_out; + end if; + when "101" => -- write PB clears, E sets + cb2_out <= not portb_write; + when "110" => -- set low + cb2_out <= '0'; + when "111" => -- set high + cb2_out <= '1'; + when others => -- no change + cb2_out <= cb2_out; + end case; + end if; +end process; + +--------------------------------- +-- +-- CB2 direction control +-- +--------------------------------- +cb2_direction : process( portb_ctrl, cb2_out ) +begin + if portb_ctrl(5) = '0' then + cb2_oe <= '0'; + cb2_o <= '0'; + else + cb2_o <= cb2_out; + cb2_oe <= '1'; + end if; +end process; + +--------------------------------- +-- +-- IRQ control +-- +--------------------------------- +pia_irq : process( irqa1, irqa2, irqb1, irqb2, porta_ctrl, portb_ctrl ) +begin + irqa <= (irqa1 and porta_ctrl(0)) or (irqa2 and porta_ctrl(3)); + irqb <= (irqb1 and portb_ctrl(0)) or (irqb2 and portb_ctrl(3)); +end process; + +end pia_arch; + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.ppf b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.ppf new file mode 100644 index 00000000..db79bfc9 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.ppf @@ -0,0 +1,14 @@ + + + + + + + + + + + + + + diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.qip b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.qip new file mode 100644 index 00000000..d4720390 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.qip @@ -0,0 +1,4 @@ +set_global_assignment -name IP_TOOL_NAME "ALTPLL" +set_global_assignment -name IP_TOOL_VERSION "13.1" +set_global_assignment -name VHDL_FILE [file join $::quartus(qip_path) "pll_mist.vhd"] +set_global_assignment -name MISC_FILE [file join $::quartus(qip_path) "pll_mist.ppf"] diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.vhd b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.vhd new file mode 100644 index 00000000..b54b7a75 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/pll_mist.vhd @@ -0,0 +1,461 @@ +-- megafunction wizard: %ALTPLL% +-- GENERATION: STANDARD +-- VERSION: WM1.0 +-- MODULE: altpll + +-- ============================================================ +-- File Name: pll_mist.vhd +-- Megafunction Name(s): +-- altpll +-- +-- Simulation Library Files(s): +-- altera_mf +-- ============================================================ +-- ************************************************************ +-- THIS IS A WIZARD-GENERATED FILE. DO NOT EDIT THIS FILE! +-- +-- 13.1.4 Build 182 03/12/2014 SJ Web Edition +-- ************************************************************ + + +--Copyright (C) 1991-2014 Altera Corporation +--Your use of Altera Corporation's design tools, logic functions +--and other software and tools, and its AMPP partner logic +--functions, and any output files from any of the foregoing +--(including device programming or simulation files), and any +--associated documentation or information are expressly subject +--to the terms and conditions of the Altera Program License +--Subscription Agreement, Altera MegaCore Function License +--Agreement, or other applicable license agreement, including, +--without limitation, that your use is for the sole purpose of +--programming logic devices manufactured by Altera and sold by +--Altera or its authorized distributors. Please refer to the +--applicable agreement for further details. + + +LIBRARY ieee; +USE ieee.std_logic_1164.all; + +LIBRARY altera_mf; +USE altera_mf.all; + +ENTITY pll_mist IS + PORT + ( + areset : IN STD_LOGIC := '0'; + inclk0 : IN STD_LOGIC := '0'; + c0 : OUT STD_LOGIC ; + c1 : OUT STD_LOGIC ; + c2 : OUT STD_LOGIC ; + c3 : OUT STD_LOGIC ; + locked : OUT STD_LOGIC + ); +END pll_mist; + + +ARCHITECTURE SYN OF pll_mist IS + + SIGNAL sub_wire0 : STD_LOGIC_VECTOR (4 DOWNTO 0); + SIGNAL sub_wire1 : STD_LOGIC ; + SIGNAL sub_wire2 : STD_LOGIC ; + SIGNAL sub_wire3 : STD_LOGIC ; + SIGNAL sub_wire4 : STD_LOGIC ; + SIGNAL sub_wire5 : STD_LOGIC ; + SIGNAL sub_wire6 : STD_LOGIC ; + SIGNAL sub_wire7 : STD_LOGIC_VECTOR (1 DOWNTO 0); + SIGNAL sub_wire8_bv : BIT_VECTOR (0 DOWNTO 0); + SIGNAL sub_wire8 : STD_LOGIC_VECTOR (0 DOWNTO 0); + + + + COMPONENT altpll + GENERIC ( + bandwidth_type : STRING; + clk0_divide_by : NATURAL; + clk0_duty_cycle : NATURAL; + clk0_multiply_by : NATURAL; + clk0_phase_shift : STRING; + clk1_divide_by : NATURAL; + clk1_duty_cycle : NATURAL; + clk1_multiply_by : NATURAL; + clk1_phase_shift : STRING; + clk2_divide_by : NATURAL; + clk2_duty_cycle : NATURAL; + clk2_multiply_by : NATURAL; + clk2_phase_shift : STRING; + clk3_divide_by : NATURAL; + clk3_duty_cycle : NATURAL; + clk3_multiply_by : NATURAL; + clk3_phase_shift : STRING; + compensate_clock : STRING; + inclk0_input_frequency : NATURAL; + intended_device_family : STRING; + lpm_hint : STRING; + lpm_type : STRING; + operation_mode : STRING; + pll_type : STRING; + port_activeclock : STRING; + port_areset : STRING; + port_clkbad0 : STRING; + port_clkbad1 : STRING; + port_clkloss : STRING; + port_clkswitch : STRING; + port_configupdate : STRING; + port_fbin : STRING; + port_inclk0 : STRING; + port_inclk1 : STRING; + port_locked : STRING; + port_pfdena : STRING; + port_phasecounterselect : STRING; + port_phasedone : STRING; + port_phasestep : STRING; + port_phaseupdown : STRING; + port_pllena : STRING; + port_scanaclr : STRING; + port_scanclk : STRING; + port_scanclkena : STRING; + port_scandata : STRING; + port_scandataout : STRING; + port_scandone : STRING; + port_scanread : STRING; + port_scanwrite : STRING; + port_clk0 : STRING; + port_clk1 : STRING; + port_clk2 : STRING; + port_clk3 : STRING; + port_clk4 : STRING; + port_clk5 : STRING; + port_clkena0 : STRING; + port_clkena1 : STRING; + port_clkena2 : STRING; + port_clkena3 : STRING; + port_clkena4 : STRING; + port_clkena5 : STRING; + port_extclk0 : STRING; + port_extclk1 : STRING; + port_extclk2 : STRING; + port_extclk3 : STRING; + self_reset_on_loss_lock : STRING; + width_clock : NATURAL + ); + PORT ( + areset : IN STD_LOGIC ; + clk : OUT STD_LOGIC_VECTOR (4 DOWNTO 0); + inclk : IN STD_LOGIC_VECTOR (1 DOWNTO 0); + locked : OUT STD_LOGIC + ); + END COMPONENT; + +BEGIN + sub_wire8_bv(0 DOWNTO 0) <= "0"; + sub_wire8 <= To_stdlogicvector(sub_wire8_bv); + sub_wire5 <= sub_wire0(2); + sub_wire4 <= sub_wire0(0); + sub_wire2 <= sub_wire0(3); + sub_wire1 <= sub_wire0(1); + c1 <= sub_wire1; + c3 <= sub_wire2; + locked <= sub_wire3; + c0 <= sub_wire4; + c2 <= sub_wire5; + sub_wire6 <= inclk0; + sub_wire7 <= sub_wire8(0 DOWNTO 0) & sub_wire6; + + altpll_component : altpll + GENERIC MAP ( + bandwidth_type => "AUTO", + clk0_divide_by => 3, + clk0_duty_cycle => 50, + clk0_multiply_by => 4, + clk0_phase_shift => "0", + clk1_divide_by => 9, + clk1_duty_cycle => 50, + clk1_multiply_by => 2, + clk1_phase_shift => "0", + clk2_divide_by => 181, + clk2_duty_cycle => 50, + clk2_multiply_by => 12, + clk2_phase_shift => "0", + clk3_divide_by => 91, + clk3_duty_cycle => 50, + clk3_multiply_by => 3, + clk3_phase_shift => "0", + compensate_clock => "CLK0", + inclk0_input_frequency => 37037, + intended_device_family => "Cyclone III", + lpm_hint => "CBX_MODULE_PREFIX=pll_mist", + lpm_type => "altpll", + operation_mode => "NORMAL", + pll_type => "AUTO", + port_activeclock => "PORT_UNUSED", + port_areset => "PORT_USED", + port_clkbad0 => "PORT_UNUSED", + port_clkbad1 => "PORT_UNUSED", + port_clkloss => "PORT_UNUSED", + port_clkswitch => "PORT_UNUSED", + port_configupdate => "PORT_UNUSED", + port_fbin => "PORT_UNUSED", + port_inclk0 => "PORT_USED", + port_inclk1 => "PORT_UNUSED", + port_locked => "PORT_USED", + port_pfdena => "PORT_UNUSED", + port_phasecounterselect => "PORT_UNUSED", + port_phasedone => "PORT_UNUSED", + port_phasestep => "PORT_UNUSED", + port_phaseupdown => "PORT_UNUSED", + port_pllena => "PORT_UNUSED", + port_scanaclr => "PORT_UNUSED", + port_scanclk => "PORT_UNUSED", + port_scanclkena => "PORT_UNUSED", + port_scandata => "PORT_UNUSED", + port_scandataout => "PORT_UNUSED", + port_scandone => "PORT_UNUSED", + port_scanread => "PORT_UNUSED", + port_scanwrite => "PORT_UNUSED", + port_clk0 => "PORT_USED", + port_clk1 => "PORT_USED", + port_clk2 => "PORT_USED", + port_clk3 => "PORT_USED", + port_clk4 => "PORT_UNUSED", + port_clk5 => "PORT_UNUSED", + port_clkena0 => "PORT_UNUSED", + port_clkena1 => "PORT_UNUSED", + port_clkena2 => "PORT_UNUSED", + port_clkena3 => "PORT_UNUSED", + port_clkena4 => "PORT_UNUSED", + port_clkena5 => "PORT_UNUSED", + port_extclk0 => "PORT_UNUSED", + port_extclk1 => "PORT_UNUSED", + port_extclk2 => "PORT_UNUSED", + port_extclk3 => "PORT_UNUSED", + self_reset_on_loss_lock => "OFF", + width_clock => 5 + ) + PORT MAP ( + areset => areset, + inclk => sub_wire7, + clk => sub_wire0, + locked => sub_wire3 + ); + + + +END SYN; + +-- ============================================================ +-- CNX file retrieval info +-- ============================================================ +-- Retrieval info: PRIVATE: ACTIVECLK_CHECK STRING "0" +-- Retrieval info: PRIVATE: BANDWIDTH STRING "1.000" +-- Retrieval info: PRIVATE: BANDWIDTH_FEATURE_ENABLED STRING "1" +-- Retrieval info: PRIVATE: BANDWIDTH_FREQ_UNIT STRING "MHz" +-- Retrieval info: PRIVATE: BANDWIDTH_PRESET STRING "Low" +-- Retrieval info: PRIVATE: BANDWIDTH_USE_AUTO STRING "1" +-- Retrieval info: PRIVATE: BANDWIDTH_USE_PRESET STRING "0" +-- Retrieval info: PRIVATE: CLKBAD_SWITCHOVER_CHECK STRING "0" +-- Retrieval info: PRIVATE: CLKLOSS_CHECK STRING "0" +-- Retrieval info: PRIVATE: CLKSWITCH_CHECK STRING "0" +-- Retrieval info: PRIVATE: CNX_NO_COMPENSATE_RADIO STRING "0" +-- Retrieval info: PRIVATE: CREATE_CLKBAD_CHECK STRING "0" +-- Retrieval info: PRIVATE: CREATE_INCLK1_CHECK STRING "0" +-- Retrieval info: PRIVATE: CUR_DEDICATED_CLK STRING "c0" +-- Retrieval info: PRIVATE: CUR_FBIN_CLK STRING "c0" +-- Retrieval info: PRIVATE: DEVICE_SPEED_GRADE STRING "8" +-- Retrieval info: PRIVATE: DIV_FACTOR0 NUMERIC "3" +-- Retrieval info: PRIVATE: DIV_FACTOR1 NUMERIC "9" +-- Retrieval info: PRIVATE: DIV_FACTOR2 NUMERIC "181" +-- Retrieval info: PRIVATE: DIV_FACTOR3 NUMERIC "91" +-- Retrieval info: PRIVATE: DUTY_CYCLE0 STRING "50.00000000" +-- Retrieval info: PRIVATE: DUTY_CYCLE1 STRING "50.00000000" +-- Retrieval info: PRIVATE: DUTY_CYCLE2 STRING "50.00000000" +-- Retrieval info: PRIVATE: DUTY_CYCLE3 STRING "50.00000000" +-- Retrieval info: PRIVATE: EFF_OUTPUT_FREQ_VALUE0 STRING "36.000000" +-- Retrieval info: PRIVATE: EFF_OUTPUT_FREQ_VALUE1 STRING "6.000000" +-- Retrieval info: PRIVATE: EFF_OUTPUT_FREQ_VALUE2 STRING "1.790055" +-- Retrieval info: PRIVATE: EFF_OUTPUT_FREQ_VALUE3 STRING "0.890110" +-- Retrieval info: PRIVATE: EXPLICIT_SWITCHOVER_COUNTER STRING "0" +-- Retrieval info: PRIVATE: EXT_FEEDBACK_RADIO STRING "0" +-- Retrieval info: PRIVATE: GLOCKED_COUNTER_EDIT_CHANGED STRING "1" +-- Retrieval info: PRIVATE: GLOCKED_FEATURE_ENABLED STRING "0" +-- Retrieval info: PRIVATE: GLOCKED_MODE_CHECK STRING "0" +-- Retrieval info: PRIVATE: GLOCK_COUNTER_EDIT NUMERIC "1048575" +-- Retrieval info: PRIVATE: HAS_MANUAL_SWITCHOVER STRING "1" +-- Retrieval info: PRIVATE: INCLK0_FREQ_EDIT STRING "27.000" +-- Retrieval info: PRIVATE: INCLK0_FREQ_UNIT_COMBO STRING "MHz" +-- Retrieval info: PRIVATE: INCLK1_FREQ_EDIT STRING "100.000" +-- Retrieval info: PRIVATE: INCLK1_FREQ_EDIT_CHANGED STRING "1" +-- Retrieval info: PRIVATE: INCLK1_FREQ_UNIT_CHANGED STRING "1" +-- Retrieval info: PRIVATE: INCLK1_FREQ_UNIT_COMBO STRING "MHz" +-- Retrieval info: PRIVATE: INTENDED_DEVICE_FAMILY STRING "Cyclone III" +-- Retrieval info: PRIVATE: INT_FEEDBACK__MODE_RADIO STRING "1" +-- Retrieval info: PRIVATE: LOCKED_OUTPUT_CHECK STRING "1" +-- Retrieval info: PRIVATE: LONG_SCAN_RADIO STRING "1" +-- Retrieval info: PRIVATE: LVDS_MODE_DATA_RATE STRING "Not Available" +-- Retrieval info: PRIVATE: LVDS_MODE_DATA_RATE_DIRTY NUMERIC "0" +-- Retrieval info: PRIVATE: LVDS_PHASE_SHIFT_UNIT0 STRING "deg" +-- Retrieval info: PRIVATE: LVDS_PHASE_SHIFT_UNIT1 STRING "deg" +-- Retrieval info: PRIVATE: LVDS_PHASE_SHIFT_UNIT2 STRING "ps" +-- Retrieval info: PRIVATE: LVDS_PHASE_SHIFT_UNIT3 STRING "ps" +-- Retrieval info: PRIVATE: MIG_DEVICE_SPEED_GRADE STRING "Any" +-- Retrieval info: PRIVATE: MIRROR_CLK0 STRING "0" +-- Retrieval info: PRIVATE: MIRROR_CLK1 STRING "0" +-- Retrieval info: PRIVATE: MIRROR_CLK2 STRING "0" +-- Retrieval info: PRIVATE: MIRROR_CLK3 STRING "0" +-- Retrieval info: PRIVATE: MULT_FACTOR0 NUMERIC "4" +-- Retrieval info: PRIVATE: MULT_FACTOR1 NUMERIC "2" +-- Retrieval info: PRIVATE: MULT_FACTOR2 NUMERIC "12" +-- Retrieval info: PRIVATE: MULT_FACTOR3 NUMERIC "3" +-- Retrieval info: PRIVATE: NORMAL_MODE_RADIO STRING "1" +-- Retrieval info: PRIVATE: OUTPUT_FREQ0 STRING "36.00000000" +-- Retrieval info: PRIVATE: OUTPUT_FREQ1 STRING "6.00000000" +-- Retrieval info: PRIVATE: OUTPUT_FREQ2 STRING "1.79000000" +-- Retrieval info: PRIVATE: OUTPUT_FREQ3 STRING "0.89000000" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_MODE0 STRING "0" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_MODE1 STRING "0" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_MODE2 STRING "0" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_MODE3 STRING "0" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_UNIT0 STRING "MHz" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_UNIT1 STRING "MHz" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_UNIT2 STRING "MHz" +-- Retrieval info: PRIVATE: OUTPUT_FREQ_UNIT3 STRING "MHz" +-- Retrieval info: PRIVATE: PHASE_RECONFIG_FEATURE_ENABLED STRING "1" +-- Retrieval info: PRIVATE: PHASE_RECONFIG_INPUTS_CHECK STRING "0" +-- Retrieval info: PRIVATE: PHASE_SHIFT0 STRING "0.00000000" +-- Retrieval info: PRIVATE: PHASE_SHIFT1 STRING "0.00000000" +-- Retrieval info: PRIVATE: PHASE_SHIFT2 STRING "0.00000000" +-- Retrieval info: PRIVATE: PHASE_SHIFT3 STRING "0.00000000" +-- Retrieval info: PRIVATE: PHASE_SHIFT_STEP_ENABLED_CHECK STRING "0" +-- Retrieval info: PRIVATE: PHASE_SHIFT_UNIT0 STRING "deg" +-- Retrieval info: PRIVATE: PHASE_SHIFT_UNIT1 STRING "deg" +-- Retrieval info: PRIVATE: PHASE_SHIFT_UNIT2 STRING "deg" +-- Retrieval info: PRIVATE: PHASE_SHIFT_UNIT3 STRING "deg" +-- Retrieval info: PRIVATE: PLL_ADVANCED_PARAM_CHECK STRING "0" +-- Retrieval info: PRIVATE: PLL_ARESET_CHECK STRING "1" +-- Retrieval info: PRIVATE: PLL_AUTOPLL_CHECK NUMERIC "1" +-- Retrieval info: PRIVATE: PLL_ENHPLL_CHECK NUMERIC "0" +-- Retrieval info: PRIVATE: PLL_FASTPLL_CHECK NUMERIC "0" +-- Retrieval info: PRIVATE: PLL_FBMIMIC_CHECK STRING "0" +-- Retrieval info: PRIVATE: PLL_LVDS_PLL_CHECK NUMERIC "0" +-- Retrieval info: PRIVATE: PLL_PFDENA_CHECK STRING "0" +-- Retrieval info: PRIVATE: PLL_TARGET_HARCOPY_CHECK NUMERIC "0" +-- Retrieval info: PRIVATE: PRIMARY_CLK_COMBO STRING "inclk0" +-- Retrieval info: PRIVATE: RECONFIG_FILE STRING "pll_mist.mif" +-- Retrieval info: PRIVATE: SACN_INPUTS_CHECK STRING "0" +-- Retrieval info: PRIVATE: SCAN_FEATURE_ENABLED STRING "1" +-- Retrieval info: PRIVATE: SELF_RESET_LOCK_LOSS STRING "0" +-- Retrieval info: PRIVATE: SHORT_SCAN_RADIO STRING "0" +-- Retrieval info: PRIVATE: SPREAD_FEATURE_ENABLED STRING "0" +-- Retrieval info: PRIVATE: SPREAD_FREQ STRING "50.000" +-- Retrieval info: PRIVATE: SPREAD_FREQ_UNIT STRING "KHz" +-- Retrieval info: PRIVATE: SPREAD_PERCENT STRING "0.500" +-- Retrieval info: PRIVATE: SPREAD_USE STRING "0" +-- Retrieval info: PRIVATE: SRC_SYNCH_COMP_RADIO STRING "0" +-- Retrieval info: PRIVATE: STICKY_CLK0 STRING "1" +-- Retrieval info: PRIVATE: STICKY_CLK1 STRING "1" +-- Retrieval info: PRIVATE: STICKY_CLK2 STRING "1" +-- Retrieval info: PRIVATE: STICKY_CLK3 STRING "1" +-- Retrieval info: PRIVATE: SWITCHOVER_COUNT_EDIT NUMERIC "1" +-- Retrieval info: PRIVATE: SWITCHOVER_FEATURE_ENABLED STRING "1" +-- Retrieval info: PRIVATE: SYNTH_WRAPPER_GEN_POSTFIX STRING "0" +-- Retrieval info: PRIVATE: USE_CLK0 STRING "1" +-- Retrieval info: PRIVATE: USE_CLK1 STRING "1" +-- Retrieval info: PRIVATE: USE_CLK2 STRING "1" +-- Retrieval info: PRIVATE: USE_CLK3 STRING "1" +-- Retrieval info: PRIVATE: USE_CLKENA0 STRING "0" +-- Retrieval info: PRIVATE: USE_CLKENA1 STRING "0" +-- Retrieval info: PRIVATE: USE_CLKENA2 STRING "0" +-- Retrieval info: PRIVATE: USE_CLKENA3 STRING "0" +-- Retrieval info: PRIVATE: USE_MIL_SPEED_GRADE NUMERIC "0" +-- Retrieval info: PRIVATE: ZERO_DELAY_RADIO STRING "0" +-- Retrieval info: LIBRARY: altera_mf altera_mf.altera_mf_components.all +-- Retrieval info: CONSTANT: BANDWIDTH_TYPE STRING "AUTO" +-- Retrieval info: CONSTANT: CLK0_DIVIDE_BY NUMERIC "3" +-- Retrieval info: CONSTANT: CLK0_DUTY_CYCLE NUMERIC "50" +-- Retrieval info: CONSTANT: CLK0_MULTIPLY_BY NUMERIC "4" +-- Retrieval info: CONSTANT: CLK0_PHASE_SHIFT STRING "0" +-- Retrieval info: CONSTANT: CLK1_DIVIDE_BY NUMERIC "9" +-- Retrieval info: CONSTANT: CLK1_DUTY_CYCLE NUMERIC "50" +-- Retrieval info: CONSTANT: CLK1_MULTIPLY_BY NUMERIC "2" +-- Retrieval info: CONSTANT: CLK1_PHASE_SHIFT STRING "0" +-- Retrieval info: CONSTANT: CLK2_DIVIDE_BY NUMERIC "181" +-- Retrieval info: CONSTANT: CLK2_DUTY_CYCLE NUMERIC "50" +-- Retrieval info: CONSTANT: CLK2_MULTIPLY_BY NUMERIC "12" +-- Retrieval info: CONSTANT: CLK2_PHASE_SHIFT STRING "0" +-- Retrieval info: CONSTANT: CLK3_DIVIDE_BY NUMERIC "91" +-- Retrieval info: CONSTANT: CLK3_DUTY_CYCLE NUMERIC "50" +-- Retrieval info: CONSTANT: CLK3_MULTIPLY_BY NUMERIC "3" +-- Retrieval info: CONSTANT: CLK3_PHASE_SHIFT STRING "0" +-- Retrieval info: CONSTANT: COMPENSATE_CLOCK STRING "CLK0" +-- Retrieval info: CONSTANT: INCLK0_INPUT_FREQUENCY NUMERIC "37037" +-- Retrieval info: CONSTANT: INTENDED_DEVICE_FAMILY STRING "Cyclone III" +-- Retrieval info: CONSTANT: LPM_TYPE STRING "altpll" +-- Retrieval info: CONSTANT: OPERATION_MODE STRING "NORMAL" +-- Retrieval info: CONSTANT: PLL_TYPE STRING "AUTO" +-- Retrieval info: CONSTANT: PORT_ACTIVECLOCK STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_ARESET STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_CLKBAD0 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_CLKBAD1 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_CLKLOSS STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_CLKSWITCH STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_CONFIGUPDATE STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_FBIN STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_INCLK0 STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_INCLK1 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_LOCKED STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_PFDENA STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_PHASECOUNTERSELECT STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_PHASEDONE STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_PHASESTEP STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_PHASEUPDOWN STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_PLLENA STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANACLR STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANCLK STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANCLKENA STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANDATA STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANDATAOUT STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANDONE STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANREAD STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_SCANWRITE STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clk0 STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_clk1 STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_clk2 STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_clk3 STRING "PORT_USED" +-- Retrieval info: CONSTANT: PORT_clk4 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clk5 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clkena0 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clkena1 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clkena2 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clkena3 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clkena4 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_clkena5 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_extclk0 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_extclk1 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_extclk2 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: PORT_extclk3 STRING "PORT_UNUSED" +-- Retrieval info: CONSTANT: SELF_RESET_ON_LOSS_LOCK STRING "OFF" +-- Retrieval info: CONSTANT: WIDTH_CLOCK NUMERIC "5" +-- Retrieval info: USED_PORT: @clk 0 0 5 0 OUTPUT_CLK_EXT VCC "@clk[4..0]" +-- Retrieval info: USED_PORT: @inclk 0 0 2 0 INPUT_CLK_EXT VCC "@inclk[1..0]" +-- Retrieval info: USED_PORT: areset 0 0 0 0 INPUT GND "areset" +-- Retrieval info: USED_PORT: c0 0 0 0 0 OUTPUT_CLK_EXT VCC "c0" +-- Retrieval info: USED_PORT: c1 0 0 0 0 OUTPUT_CLK_EXT VCC "c1" +-- Retrieval info: USED_PORT: c2 0 0 0 0 OUTPUT_CLK_EXT VCC "c2" +-- Retrieval info: USED_PORT: c3 0 0 0 0 OUTPUT_CLK_EXT VCC "c3" +-- Retrieval info: USED_PORT: inclk0 0 0 0 0 INPUT_CLK_EXT GND "inclk0" +-- Retrieval info: USED_PORT: locked 0 0 0 0 OUTPUT GND "locked" +-- Retrieval info: CONNECT: @areset 0 0 0 0 areset 0 0 0 0 +-- Retrieval info: CONNECT: @inclk 0 0 1 1 GND 0 0 0 0 +-- Retrieval info: CONNECT: @inclk 0 0 1 0 inclk0 0 0 0 0 +-- Retrieval info: CONNECT: c0 0 0 0 0 @clk 0 0 1 0 +-- Retrieval info: CONNECT: c1 0 0 0 0 @clk 0 0 1 1 +-- Retrieval info: CONNECT: c2 0 0 0 0 @clk 0 0 1 2 +-- Retrieval info: CONNECT: c3 0 0 0 0 @clk 0 0 1 3 +-- Retrieval info: CONNECT: locked 0 0 0 0 @locked 0 0 0 0 +-- Retrieval info: GEN_FILE: TYPE_NORMAL pll_mist.vhd TRUE +-- Retrieval info: GEN_FILE: TYPE_NORMAL pll_mist.ppf TRUE +-- Retrieval info: GEN_FILE: TYPE_NORMAL pll_mist.inc FALSE +-- Retrieval info: GEN_FILE: TYPE_NORMAL pll_mist.cmp FALSE +-- Retrieval info: GEN_FILE: TYPE_NORMAL pll_mist.bsf FALSE +-- Retrieval info: GEN_FILE: TYPE_NORMAL pll_mist_inst.vhd FALSE +-- Retrieval info: LIB_FILE: altera_mf +-- Retrieval info: CBX_MODULE_PREFIX: ON diff --git a/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/sdram.sv b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/sdram.sv new file mode 100644 index 00000000..8f927d05 --- /dev/null +++ b/Arcade_MiST/Williams 6809 rev.1 Hardware/Mayday/rtl/sdram.sv @@ -0,0 +1,254 @@ +// +// sdram.v +// +// Static RAM controller implementation using SDRAM MT48LC16M16A2 +// +// Copyright (c) 2015,2016 Sorgelig +// +// Some parts of SDRAM code used from project: +// http://hamsterworks.co.nz/mediawiki/index.php/Simple_SDRAM_Controller +// +// This source file is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published +// by the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This source file is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see . +// +// ------------------------------------------ +// +// v2.1 - Add universal 8/16 bit mode. +// + +module sdram +( + input init, // reset to initialize RAM + input clk, // clock ~100MHz + // + // SDRAM_* - signals to the MT48LC16M16 chip + inout reg [15:0] SDRAM_DQ, // 16 bit bidirectional data bus + output reg [12:0] SDRAM_A, // 13 bit multiplexed address bus + output reg SDRAM_DQML, // two byte masks + output reg SDRAM_DQMH, // + output reg [1:0] SDRAM_BA, // two banks + output SDRAM_nCS, // a single chip select + output SDRAM_nWE, // write enable + output SDRAM_nRAS, // row address select + output SDRAM_nCAS, // columns address select + output SDRAM_CKE, // clock enable + // + input [1:0] wtbt, // 16bit mode: bit1 - write high byte, bit0 - write low byte, + // 8bit mode: 2'b00 - use addr[0] to decide which byte to write + // Ignored while reading. + // + input [24:0] addr, // 25 bit address for 8bit mode. addr[0] = 0 for 16bit mode for correct operations. + output [15:0] dout, // data output to cpu + input [15:0] din, // data input from cpu + input we, // cpu requests write + input rd, // cpu requests read + output reg ready // dout is valid. Ready to accept new read/write. +); + +assign SDRAM_nCS = command[3]; +assign SDRAM_nRAS = command[2]; +assign SDRAM_nCAS = command[1]; +assign SDRAM_nWE = command[0]; +assign SDRAM_CKE = cke; + +// no burst configured +localparam BURST_LENGTH = 3'b000; // 000=1, 001=2, 010=4, 011=8 +localparam ACCESS_TYPE = 1'b0; // 0=sequential, 1=interleaved +localparam CAS_LATENCY = 3'd2; // 2 for < 100MHz, 3 for >100MHz +localparam OP_MODE = 2'b00; // only 00 (standard operation) allowed +localparam NO_WRITE_BURST = 1'b1; // 0= write burst enabled, 1=only single access write +localparam MODE = {3'b000, NO_WRITE_BURST, OP_MODE, CAS_LATENCY, ACCESS_TYPE, BURST_LENGTH}; + +localparam sdram_startup_cycles= 14'd12100;// 100us, plus a little more, @ 100MHz +localparam cycles_per_refresh = 14'd186; // (64000*36)/8192-1 Calc'd as (64ms @ 36MHz)/8192 rose +localparam startup_refresh_max = 14'b11111111111111; + +// SDRAM commands +localparam CMD_INHIBIT = 4'b1111; +localparam CMD_NOP = 4'b0111; +localparam CMD_ACTIVE = 4'b0011; +localparam CMD_READ = 4'b0101; +localparam CMD_WRITE = 4'b0100; +localparam CMD_BURST_TERMINATE = 4'b0110; +localparam CMD_PRECHARGE = 4'b0010; +localparam CMD_AUTO_REFRESH = 4'b0001; +localparam CMD_LOAD_MODE = 4'b0000; + +reg [13:0] refresh_count = startup_refresh_max - sdram_startup_cycles; +reg [3:0] command = CMD_INHIBIT; +reg cke = 0; +reg [24:0] save_addr; +reg [15:0] data; + +assign dout = save_addr[0] ? {data[7:0], data[15:8]} : {data[15:8], data[7:0]}; +typedef enum +{ + STATE_STARTUP, + STATE_OPEN_1, + STATE_WRITE, + STATE_READ, + STATE_IDLE, STATE_IDLE_1, STATE_IDLE_2, STATE_IDLE_3, + STATE_IDLE_4, STATE_IDLE_5, STATE_IDLE_6, STATE_IDLE_7 +} state_t; + +state_t state = STATE_STARTUP; + +always @(posedge clk) begin + reg old_we, old_rd; + reg [CAS_LATENCY:0] data_ready_delay; + + reg [15:0] new_data; + reg [1:0] new_wtbt; + reg new_we; + reg new_rd; + reg save_we = 1; + + + command <= CMD_NOP; + refresh_count <= refresh_count+1'b1; + + data_ready_delay <= {1'b0, data_ready_delay[CAS_LATENCY:1]}; + + if(data_ready_delay[0]) data <= SDRAM_DQ; + + case(state) + STATE_STARTUP: begin + //------------------------------------------------------------------------ + //-- This is the initial startup state, where we wait for at least 100us + //-- before starting the start sequence + //-- + //-- The initialisation is sequence is + //-- * de-assert SDRAM_CKE + //-- * 100us wait, + //-- * assert SDRAM_CKE + //-- * wait at least one cycle, + //-- * PRECHARGE + //-- * wait 2 cycles + //-- * REFRESH, + //-- * tREF wait + //-- * REFRESH, + //-- * tREF wait + //-- * LOAD_MODE_REG + //-- * 2 cycles wait + //------------------------------------------------------------------------ + cke <= 1; + SDRAM_DQ <= 16'bZZZZZZZZZZZZZZZZ; + SDRAM_DQML <= 1; + SDRAM_DQMH <= 1; + SDRAM_A <= 0; + SDRAM_BA <= 0; + + // All the commands during the startup are NOPS, except these + if(refresh_count == startup_refresh_max-31) begin + // ensure all rows are closed + command <= CMD_PRECHARGE; + SDRAM_A[10] <= 1; // all banks + SDRAM_BA <= 2'b00; + end else if (refresh_count == startup_refresh_max-23) begin + // these refreshes need to be at least tREF (66ns) apart + command <= CMD_AUTO_REFRESH; + end else if (refresh_count == startup_refresh_max-15) + command <= CMD_AUTO_REFRESH; + else if (refresh_count == startup_refresh_max-7) begin + // Now load the mode register + command <= CMD_LOAD_MODE; + SDRAM_A <= MODE; + end + + //------------------------------------------------------ + //-- if startup is complete then go into idle mode, + //-- get prepared to accept a new command, and schedule + //-- the first refresh cycle + //------------------------------------------------------ + if(!refresh_count) begin + state <= STATE_IDLE; + ready <= 1; + refresh_count <= 0; + end + end + + STATE_IDLE_7: state <= STATE_IDLE_6; + STATE_IDLE_6: state <= STATE_IDLE_5; + STATE_IDLE_5: state <= STATE_IDLE_4; + STATE_IDLE_4: state <= STATE_IDLE_3; + STATE_IDLE_3: state <= STATE_IDLE_2; + STATE_IDLE_2: state <= STATE_IDLE_1; + STATE_IDLE_1: begin + SDRAM_DQ <= 16'bZZZZZZZZZZZZZZZZ; + state <= STATE_IDLE; + // mask possible refresh to reduce colliding. + if(refresh_count > cycles_per_refresh) begin + //------------------------------------------------------------------------ + //-- Start the refresh cycle. + //-- This tasks tRFC (66ns), so 2 idle cycles are needed @ 36MHz + //------------------------------------------------------------------------ + state <= STATE_IDLE_2; + command <= CMD_AUTO_REFRESH; + refresh_count <= refresh_count - cycles_per_refresh + 1'd1; + end + end + + STATE_IDLE: begin + // Priority is to issue a refresh if one is outstanding + if(refresh_count > (cycles_per_refresh<<1)) state <= STATE_IDLE_1; + else if(new_rd | new_we) begin + new_we <= 0; + new_rd <= 0; + save_addr<= addr; + save_we <= new_we; + state <= STATE_OPEN_1; + command <= CMD_ACTIVE; + SDRAM_A <= addr[13:1]; + SDRAM_BA <= addr[24:23]; + end + end + + // ACTIVE-to-READ or WRITE delay >20ns (1 cycle @ 36 MHz)(-75) + STATE_OPEN_1: begin + SDRAM_A <= {4'b0010, save_addr[22:14]}; + SDRAM_DQML <= save_we & (new_wtbt ? ~new_wtbt[0] : save_addr[0]); + SDRAM_DQMH <= save_we & (new_wtbt ? ~new_wtbt[1] : ~save_addr[0]); + state <= save_we ? STATE_WRITE : STATE_READ; + end + + STATE_READ: begin + state <= STATE_IDLE_5; + command <= CMD_READ; + SDRAM_DQ <= 16'bZZZZZZZZZZZZZZZZ; + + // Schedule reading the data values off the bus + data_ready_delay[CAS_LATENCY] <= 1; + end + + STATE_WRITE: begin + state <= STATE_IDLE_5; + command <= CMD_WRITE; + SDRAM_DQ <= new_wtbt ? new_data : {new_data[7:0], new_data[7:0]}; + ready <= 1; + end + endcase + + if(init) begin + state <= STATE_STARTUP; + refresh_count <= startup_refresh_max - sdram_startup_cycles; + end + + old_we <= we; + old_rd <= rd; + if(we & ~old_we) {ready, new_we, new_data, new_wtbt} <= {1'b0, 1'b1, din, wtbt}; + else + if((rd & ~old_rd) || (rd & old_rd & (save_addr != addr))) {ready, new_rd} <= {1'b0, 1'b1}; + +end + +endmodule