diff --git a/Sega - SG1000/Snapshot/sg1000_mist.rbf b/Sega - SG1000/Snapshot/sg1000_mist.rbf new file mode 100644 index 00000000..d9efdb9e Binary files /dev/null and b/Sega - SG1000/Snapshot/sg1000_mist.rbf differ diff --git a/Sega - SG1000/clean.bat b/Sega - SG1000/clean.bat new file mode 100644 index 00000000..748b4d5b --- /dev/null +++ b/Sega - SG1000/clean.bat @@ -0,0 +1,38 @@ +@echo off +del /s *.bak +del /s *.orig +del /s *.rej +del /s *~ +rmdir /s /q db +rmdir /s /q incremental_db +rmdir /s /q output_files +rmdir /s /q simulation +rmdir /s /q greybox_tmp +rmdir /s /q hc_output +rmdir /s /q .qsys_edit +rmdir /s /q hps_isw_handoff +rmdir /s /q sys\.qsys_edit +rmdir /s /q sys\vip +cd sys +for /d %%i in (*_sim) do rmdir /s /q "%%~nxi" +cd .. +for /d %%i in (*_sim) do rmdir /s /q "%%~nxi" +del build_id.v +del c5_pin_model_dump.txt +del PLLJ_PLLSPE_INFO.txt +del /s *.qws +del /s *.ppf +del /s *.ddb +del /s *.csv +del /s *.cmp +del /s *.sip +del /s *.spd +del /s *.bsf +del /s *.f +del /s *.sopcinfo +del /s *.xml +del *.cdf +del *.rpt +del /s new_rtl_netlist +del /s old_rtl_netlist +pause diff --git a/Sega - SG1000/rtl/dpram.vhd b/Sega - SG1000/rtl/dpram.vhd new file mode 100644 index 00000000..9ea85a26 --- /dev/null +++ b/Sega - SG1000/rtl/dpram.vhd @@ -0,0 +1,130 @@ +LIBRARY ieee; +USE ieee.std_logic_1164.all; + +LIBRARY altera_mf; +USE altera_mf.all; + +ENTITY dpram IS + GENERIC + ( + init_file : string := ""; + widthad_a : natural; + width_a : natural := 8; + outdata_reg_a : string := "UNREGISTERED"; + outdata_reg_b : string := "UNREGISTERED" + ); + PORT + ( + address_a : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + address_b : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + clock_a : IN STD_LOGIC ; + clock_b : IN STD_LOGIC ; + data_a : IN STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + data_b : IN STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + wren_a : IN STD_LOGIC := '1'; + wren_b : IN STD_LOGIC := '1'; + q_a : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + q_b : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0) + ); +END dpram; + + +ARCHITECTURE SYN OF dpram IS + + SIGNAL sub_wire0 : STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + SIGNAL sub_wire1 : STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + + + + COMPONENT altsyncram + GENERIC ( + address_reg_b : STRING; + clock_enable_input_a : STRING; + clock_enable_input_b : STRING; + clock_enable_output_a : STRING; + clock_enable_output_b : STRING; + indata_reg_b : STRING; + init_file : STRING; + intended_device_family : STRING; + lpm_type : STRING; + numwords_a : NATURAL; + numwords_b : NATURAL; + operation_mode : STRING; + outdata_aclr_a : STRING; + outdata_aclr_b : STRING; + outdata_reg_a : STRING; + outdata_reg_b : STRING; + power_up_uninitialized : STRING; + read_during_write_mode_port_a : STRING; + read_during_write_mode_port_b : STRING; + widthad_a : NATURAL; + widthad_b : NATURAL; + width_a : NATURAL; + width_b : NATURAL; + width_byteena_a : NATURAL; + width_byteena_b : NATURAL; + wrcontrol_wraddress_reg_b : STRING + ); + PORT ( + wren_a : IN STD_LOGIC ; + clock0 : IN STD_LOGIC ; + wren_b : IN STD_LOGIC ; + clock1 : IN STD_LOGIC ; + address_a : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + address_b : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + q_a : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + q_b : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + data_a : IN STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + data_b : IN STD_LOGIC_VECTOR (width_a-1 DOWNTO 0) + ); + END COMPONENT; + +BEGIN + q_a <= sub_wire0(width_a-1 DOWNTO 0); + q_b <= sub_wire1(width_a-1 DOWNTO 0); + + altsyncram_component : altsyncram + GENERIC MAP ( + address_reg_b => "CLOCK1", + clock_enable_input_a => "BYPASS", + clock_enable_input_b => "BYPASS", + clock_enable_output_a => "BYPASS", + clock_enable_output_b => "BYPASS", + indata_reg_b => "CLOCK1", + init_file => init_file, + intended_device_family => "Cyclone III", + lpm_type => "altsyncram", + numwords_a => 2**widthad_a, + numwords_b => 2**widthad_a, + operation_mode => "BIDIR_DUAL_PORT", + outdata_aclr_a => "NONE", + outdata_aclr_b => "NONE", + outdata_reg_a => outdata_reg_a, + outdata_reg_b => outdata_reg_a, + power_up_uninitialized => "FALSE", + read_during_write_mode_port_a => "NEW_DATA_NO_NBE_READ", + read_during_write_mode_port_b => "NEW_DATA_NO_NBE_READ", + widthad_a => widthad_a, + widthad_b => widthad_a, + width_a => width_a, + width_b => width_a, + width_byteena_a => 1, + width_byteena_b => 1, + wrcontrol_wraddress_reg_b => "CLOCK1" + ) + PORT MAP ( + wren_a => wren_a, + clock0 => clock_a, + wren_b => wren_b, + clock1 => clock_b, + address_a => address_a, + address_b => address_b, + data_a => data_a, + data_b => data_b, + q_a => sub_wire0, + q_b => sub_wire1 + ); + + + +END SYN; diff --git a/Sega - SG1000/rtl/psg/psg.vhd b/Sega - SG1000/rtl/psg/psg.vhd new file mode 100644 index 00000000..dd4bba90 --- /dev/null +++ b/Sega - SG1000/rtl/psg/psg.vhd @@ -0,0 +1,134 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity psg is + port (clk : in STD_LOGIC; + WR_n : in STD_LOGIC; + D_in : in STD_LOGIC_VECTOR (7 downto 0); + outputs: out STD_LOGIC_VECTOR (5 downto 0) + ); + +end psg; + +architecture rtl of psg is + + signal clk_divide : unsigned(5 downto 0) := "000000"; + signal clk32 : std_logic; + signal regn : std_logic_vector(2 downto 0); + signal tone0 : std_logic_vector(9 downto 0):="0000100000"; + signal tone1 : std_logic_vector(9 downto 0):="0000100000"; + signal tone2 : std_logic_vector(9 downto 0):="0000100000"; + signal ctrl3 : std_logic_vector(2 downto 0):="100"; + signal volume0 : std_logic_vector(3 downto 0):="1111"; + signal volume1 : std_logic_vector(3 downto 0):="1111"; + signal volume2 : std_logic_vector(3 downto 0):="1111"; + signal volume3 : std_logic_vector(3 downto 0):="1111"; + signal output0 : std_logic_vector(3 downto 0); + signal output1 : std_logic_vector(3 downto 0); + signal output2 : std_logic_vector(3 downto 0); + signal output3 : std_logic_vector(3 downto 0); + +-- signal outputs : std_logic_vector(5 downto 0); + + component psg_tone is + port (clk : in STD_LOGIC; + tone : in STD_LOGIC_VECTOR (9 downto 0); + volume: in STD_LOGIC_VECTOR (3 downto 0); + output: out STD_LOGIC_VECTOR (3 downto 0)); + end component; + + component psg_noise is + port (clk : in STD_LOGIC; + style : in STD_LOGIC_VECTOR (2 downto 0); + tone : in STD_LOGIC_VECTOR (9 downto 0); + volume: in STD_LOGIC_VECTOR (3 downto 0); + output: out STD_LOGIC_VECTOR (3 downto 0)); + end component; + + component dac is + port (clk : in STD_LOGIC; + input : in STD_LOGIC_VECTOR (5 downto 0); + output: out STD_LOGIC); + end component; +begin + + t0: psg_tone + port map ( + clk => clk32, + tone => tone0, + volume => volume0, + output => output0); + + t1: psg_tone + port map ( + clk => clk32, + tone => tone1, + volume => volume1, + output => output1); + + t2: psg_tone + port map ( + clk => clk32, + tone => tone2, + volume => volume2, + output => output2); + + t3: psg_noise + port map( + clk => clk32, + style => ctrl3, + tone => tone2, + volume => volume3, + output => output3); + + + process (clk) + begin + if rising_edge(clk) then + clk_divide <= clk_divide+1; + end if; + end process; + clk32 <= std_logic(clk_divide(5)); + + process (clk, WR_n) + begin + if rising_edge(clk) and WR_n='0' then + if D_in(7)='1' then + case D_in(6 downto 4) is + when "000" => tone0(3 downto 0) <= D_in(3 downto 0); + when "010" => tone1(3 downto 0) <= D_in(3 downto 0); + when "100" => tone2(3 downto 0) <= D_in(3 downto 0); + when "110" => ctrl3 <= D_in(2 downto 0); + when "001" => volume0 <= D_in(3 downto 0); + when "011" => volume1 <= D_in(3 downto 0); + when "101" => volume2 <= D_in(3 downto 0); + when "111" => volume3 <= D_in(3 downto 0); + when others => + end case; + regn <= D_in(6 downto 4); + else + case regn is + when "000" => tone0(9 downto 4) <= D_in(5 downto 0); + when "010" => tone1(9 downto 4) <= D_in(5 downto 0); + when "100" => tone2(9 downto 4) <= D_in(5 downto 0); + when "110" => + when "001" => volume0 <= D_in(3 downto 0); + when "011" => volume1 <= D_in(3 downto 0); + when "101" => volume2 <= D_in(3 downto 0); + when "111" => volume3 <= D_in(3 downto 0); + when others => + end case; + end if; + end if; + end process; + + outputs <= std_logic_vector( + unsigned("00"&output0) + + unsigned("00"&output1) + + unsigned("00"&output2) + + unsigned("00"&output3) + ); + +end rtl; + diff --git a/Sega - SG1000/rtl/psg/psg_noise.vhd b/Sega - SG1000/rtl/psg/psg_noise.vhd new file mode 100644 index 00000000..7dee6168 --- /dev/null +++ b/Sega - SG1000/rtl/psg/psg_noise.vhd @@ -0,0 +1,56 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity psg_noise is +port ( + clk : in STD_LOGIC; + style : in STD_LOGIC_VECTOR (2 downto 0); + tone : in STD_LOGIC_VECTOR (9 downto 0); + volume : in STD_LOGIC_VECTOR (3 downto 0); + output : out STD_LOGIC_VECTOR (3 downto 0)); +end psg_noise; + +architecture rtl of psg_noise is + + signal counter : unsigned(9 downto 0); + signal v : std_logic; + signal shift : std_logic_vector(15 downto 0) := "1000000000000000"; + +begin + + process (clk, tone) + begin + if rising_edge(clk) then + if counter="000000001" then + v <= not v; + case style(1 downto 0) is + when "00" => counter <= "0000010000"; + when "01" => counter <= "0000100000"; + when "10" => counter <= "0001000000"; + when "11" => counter <= unsigned(tone); + when others => + end case; + else + counter <= counter-1; + end if; + end if; + end process; + + process (v) + variable feedback: std_logic; + begin + if rising_edge(v) then + if (style(2)='1') then + feedback := shift(0) xor shift(3); + else + feedback := shift(0); + end if; + shift <= feedback & shift(15 downto 1); + end if; + end process; + + output <= (shift(0)&shift(0)&shift(0)&shift(0)) or volume; + +end rtl; + diff --git a/Sega - SG1000/rtl/psg/psg_tone.vhd b/Sega - SG1000/rtl/psg/psg_tone.vhd new file mode 100644 index 00000000..7ec6b552 --- /dev/null +++ b/Sega - SG1000/rtl/psg/psg_tone.vhd @@ -0,0 +1,34 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity psg_tone is + Port ( + clk : in STD_LOGIC; + tone : in STD_LOGIC_VECTOR (9 downto 0); + volume: in STD_LOGIC_VECTOR (3 downto 0); + output: out STD_LOGIC_VECTOR (3 downto 0)); +end psg_tone; + +architecture rtl of psg_tone is + + signal counter : unsigned(9 downto 0) := (0=>'1', others=>'0'); + signal v : std_logic := '0'; + +begin + + process (clk, tone) + begin + if rising_edge(clk) then + if counter="000000000" then + v <= not v; + counter <= unsigned(tone); + else + counter <= counter-1; + end if; + end if; + end process; + + output <= (v&v&v&v) or volume; +end rtl; + diff --git a/Sega - SG1000/rtl/sg1000_top.sv b/Sega - SG1000/rtl/sg1000_top.sv new file mode 100644 index 00000000..f15cb73e --- /dev/null +++ b/Sega - SG1000/rtl/sg1000_top.sv @@ -0,0 +1,116 @@ +module sg1000_top( +input RESET_n, +input sys_clk, +input clk_vdp, +input pause, +input [7:0] Cart_In, +output [7:0] Cart_Out, +output [14:0] Cart_Addr, +output x, +output y, +output vblank, +output hblank, +output [7:0] color, +input [7:0] Joy_A, +input [7:0] Joy_B +); + +wire WAIT_n, MREQ_n, M1_n, IORQ_n, RFSH_n, INT_n; +wire NMI_n = pause;//go to M1_n and generate CS_PSG_n +wire RD_n, WR_n; +wire [7:0]D_in, D_out, RAM_D_out; +wire [15:0]Addr; + +T80se #( + .Mode(0), + .T2Write(0), + .IOWait(1)) +CPU ( + .RESET_n(RESET_n), + .CLK_n(sys_clk), + .CLKEN(1'b1), + .WAIT_n(1'b1), + .INT_n(INT_n), + .NMI_n(NMI_n), + .BUSRQ_n(),//? + .M1_n(M1_n), + .MREQ_n(MREQ_n), + .IORQ_n(IORQ_n), + .RD_n(RD_n), + .WR_n(WR_n), + .RFSH_n(RFSH_n), + .HALT_n(WAIT_n), + .BUSAK_n(), + .A(Addr), + .DI(D_in), + .DO(D_out) + ); + +spram #( + .widthad_a(10), + .width_a(8)) +MRAM ( + .address(Addr[9:0]), + .clock(sys_clk), + .data(D_out), + .wren(WR_n), + .q(RAM_D_out) + ); + +assign Cart_Addr = Addr[14:0]; + +spram #( + .widthad_a(15), + .width_a(8)) +CART ( + .address(Cart_Addr), + .clock(sys_clk), + .data(Cart_In), + .wren(WR_n), + .q(Cart_Out) + ); + +wire [5:0]audio; + +psg PSG ( + .clk(sys_clk), + .WR_n(WR_n), + .D_in(D_out), + .outputs(audio) + ); + +wire [7:0]vdp_D_out; + + +vdp vdp ( + .cpu_clk(sys_clk), + .vdp_clk(clk_vdp), + .RD_n(VDP_RD_n), + .WR_n(VDP_WR_n), + .IRQ_n(IORQ_n), + .A(Addr[7:0]), + .D_in(D_out), + .D_out(vdp_D_out), + .x(x), + .y(y), + .vblank(vblank), + .hblank(hblank), + .color(color) + ); + + +wire CS_WRAM_n = (~MREQ_n & Addr[15:14] == "11") ? 1'b0 : 1'b1; +wire EXM1_n = (~MREQ_n & Addr[15:14] == "10") ? 1'b0 : 1'b1; +wire EXM2_n = (~MREQ_n | Addr[15]) ? 1'b0 : 1'b1; +wire CS_PSG_n = (~IORQ_n & Addr[7:6] == "01") ? 1'b0 : 1'b1; + +wire VDP_RD_n = (~IORQ_n & Addr[7:6] == "10") | RD_n ? 1'b0 : 1'b1; +wire VDP_WR_n = (~IORQ_n & Addr[7:6] == "10") | WR_n ? 1'b0 : 1'b1; +wire JOY_SEL_n = (~IORQ_n & Addr[7:6] == "11") | RD_n ? 1'b0 : 1'b1; +wire KB_SEL_n = (~IORQ_n & Addr[7:6] == "11") ? 1'b0 : 1'b1; + +assign D_in = ~CS_WRAM_n ? RAM_D_out : + ~VDP_RD_n ? vdp_D_out : + "00000000"; + +endmodule \ No newline at end of file diff --git a/Sega - SG1000/rtl/spram.vhd b/Sega - SG1000/rtl/spram.vhd new file mode 100644 index 00000000..d4e8dd90 --- /dev/null +++ b/Sega - SG1000/rtl/spram.vhd @@ -0,0 +1,90 @@ +LIBRARY ieee; +USE ieee.std_logic_1164.all; + +LIBRARY altera_mf; +USE altera_mf.all; + +ENTITY spram IS + GENERIC + ( + init_file : string := ""; + widthad_a : natural; + width_a : natural := 8; + outdata_reg_a : string := "UNREGISTERED" + ); + PORT + ( + address : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + clock : IN STD_LOGIC ; + data : IN STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + wren : IN STD_LOGIC ; + q : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0) + ); +END spram; + + +ARCHITECTURE SYN OF spram IS + + SIGNAL sub_wire0 : STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + + + + COMPONENT altsyncram + GENERIC ( + clock_enable_input_a : STRING; + clock_enable_output_a : STRING; + init_file : STRING; + intended_device_family : STRING; + lpm_hint : STRING; + lpm_type : STRING; + numwords_a : NATURAL; + operation_mode : STRING; + outdata_aclr_a : STRING; + outdata_reg_a : STRING; + power_up_uninitialized : STRING; + read_during_write_mode_port_a : STRING; + widthad_a : NATURAL; + width_a : NATURAL; + width_byteena_a : NATURAL + ); + PORT ( + wren_a : IN STD_LOGIC ; + clock0 : IN STD_LOGIC ; + address_a : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + q_a : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + data_a : IN STD_LOGIC_VECTOR (width_a-1 DOWNTO 0) + ); + END COMPONENT; + +BEGIN + q <= sub_wire0(width_a-1 DOWNTO 0); + + altsyncram_component : altsyncram + GENERIC MAP ( + clock_enable_input_a => "BYPASS", + clock_enable_output_a => "BYPASS", + init_file => init_file, + intended_device_family => "Cyclone III", + lpm_hint => "ENABLE_RUNTIME_MOD=NO", + lpm_type => "altsyncram", + numwords_a => 2**widthad_a, + operation_mode => "SINGLE_PORT", + outdata_aclr_a => "NONE", + outdata_reg_a => outdata_reg_a, + power_up_uninitialized => "FALSE", + read_during_write_mode_port_a => "NEW_DATA_NO_NBE_READ", + widthad_a => widthad_a, + width_a => width_a, + width_byteena_a => 1 + ) + PORT MAP ( + wren_a => wren, + clock0 => clock, + address_a => address, + data_a => data, + q_a => sub_wire0 + ); + + + +END SYN; diff --git a/Sega - SG1000/rtl/sprom.vhd b/Sega - SG1000/rtl/sprom.vhd new file mode 100644 index 00000000..a81ac959 --- /dev/null +++ b/Sega - SG1000/rtl/sprom.vhd @@ -0,0 +1,82 @@ +LIBRARY ieee; +USE ieee.std_logic_1164.all; + +LIBRARY altera_mf; +USE altera_mf.all; + +ENTITY sprom IS + GENERIC + ( + init_file : string := ""; + widthad_a : natural; + width_a : natural := 8; + outdata_reg_a : string := "UNREGISTERED" + ); + PORT + ( + address : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + clock : IN STD_LOGIC ; + q : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0) + ); +END sprom; + + +ARCHITECTURE SYN OF sprom IS + + SIGNAL sub_wire0 : STD_LOGIC_VECTOR (width_a-1 DOWNTO 0); + + + + COMPONENT altsyncram + GENERIC ( + address_aclr_a : STRING; + clock_enable_input_a : STRING; + clock_enable_output_a : STRING; + init_file : STRING; + intended_device_family : STRING; + lpm_hint : STRING; + lpm_type : STRING; + numwords_a : NATURAL; + operation_mode : STRING; + outdata_aclr_a : STRING; + outdata_reg_a : STRING; + widthad_a : NATURAL; + width_a : NATURAL; + width_byteena_a : NATURAL + ); + PORT ( + clock0 : IN STD_LOGIC ; + address_a : IN STD_LOGIC_VECTOR (widthad_a-1 DOWNTO 0); + q_a : OUT STD_LOGIC_VECTOR (width_a-1 DOWNTO 0) + ); + END COMPONENT; + +BEGIN + q <= sub_wire0(width_a-1 DOWNTO 0); + + altsyncram_component : altsyncram + GENERIC MAP ( + address_aclr_a => "NONE", + clock_enable_input_a => "BYPASS", + clock_enable_output_a => "BYPASS", + init_file => init_file, + intended_device_family => "Cyclone III", + lpm_hint => "ENABLE_RUNTIME_MOD=NO", + lpm_type => "altsyncram", + numwords_a => 2**widthad_a, + operation_mode => "ROM", + outdata_aclr_a => "NONE", + outdata_reg_a => outdata_reg_a, + widthad_a => widthad_a, + width_a => width_a, + width_byteena_a => 1 + ) + PORT MAP ( + clock0 => clock, + address_a => address, + q_a => sub_wire0 + ); + + + +END SYN; diff --git a/Sega - SG1000/rtl/t80/T80.vhd b/Sega - SG1000/rtl/t80/T80.vhd new file mode 100644 index 00000000..398fa0df --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80.vhd @@ -0,0 +1,1073 @@ +-- +-- Z80 compatible microprocessor core +-- +-- Version : 0247 +-- +-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t80/ +-- +-- Limitations : +-- +-- File history : +-- +-- 0208 : First complete release +-- +-- 0210 : Fixed wait and halt +-- +-- 0211 : Fixed Refresh addition and IM 1 +-- +-- 0214 : Fixed mostly flags, only the block instructions now fail the zex regression test +-- +-- 0232 : Removed refresh address output for Mode > 1 and added DJNZ M1_n fix by Mike Johnson +-- +-- 0235 : Added clock enable and IM 2 fix by Mike Johnson +-- +-- 0237 : Changed 8080 I/O address output, added IntE output +-- +-- 0238 : Fixed (IX/IY+d) timing and 16 bit ADC and SBC zero flag +-- +-- 0240 : Added interrupt ack fix by Mike Johnson, changed (IX/IY+d) timing and changed flags in GB mode +-- +-- 0242 : Added I/O wait, fixed refresh address, moved some registers to RAM +-- +-- 0247 : Fixed bus req/ack cycle +-- + +library IEEE; +use IEEE.std_logic_1164.all; +use IEEE.numeric_std.all; +use work.T80_Pack.all; + +entity T80 is + generic( + Mode : integer := 0; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB + IOWait : integer := 0; -- 1 => Single cycle I/O, 1 => Std I/O cycle + Flag_C : integer := 0; + Flag_N : integer := 1; + Flag_P : integer := 2; + Flag_X : integer := 3; + Flag_H : integer := 4; + Flag_Y : integer := 5; + Flag_Z : integer := 6; + Flag_S : integer := 7 + ); + port( + RESET_n : in std_logic; + CLK_n : in std_logic; + CEN : in std_logic; + WAIT_n : in std_logic; + INT_n : in std_logic; + NMI_n : in std_logic; + BUSRQ_n : in std_logic; + M1_n : out std_logic; + IORQ : out std_logic; + NoRead : out std_logic; + Write : out std_logic; + RFSH_n : out std_logic; + HALT_n : out std_logic; + BUSAK_n : out std_logic; + A : out std_logic_vector(15 downto 0); + DInst : in std_logic_vector(7 downto 0); + DI : in std_logic_vector(7 downto 0); + DO : out std_logic_vector(7 downto 0); + MC : out std_logic_vector(2 downto 0); + TS : out std_logic_vector(2 downto 0); + IntCycle_n : out std_logic; + IntE : out std_logic; + Stop : out std_logic + ); +end T80; + +architecture rtl of T80 is + + constant aNone : std_logic_vector(2 downto 0) := "111"; + constant aBC : std_logic_vector(2 downto 0) := "000"; + constant aDE : std_logic_vector(2 downto 0) := "001"; + constant aXY : std_logic_vector(2 downto 0) := "010"; + constant aIOA : std_logic_vector(2 downto 0) := "100"; + constant aSP : std_logic_vector(2 downto 0) := "101"; + constant aZI : std_logic_vector(2 downto 0) := "110"; + + -- Registers + signal ACC, F : std_logic_vector(7 downto 0); + signal Ap, Fp : std_logic_vector(7 downto 0); + signal I : std_logic_vector(7 downto 0); + signal R : unsigned(7 downto 0); + signal SP, PC : unsigned(15 downto 0); + signal RegDIH : std_logic_vector(7 downto 0); + signal RegDIL : std_logic_vector(7 downto 0); + signal RegBusA : std_logic_vector(15 downto 0); + signal RegBusB : std_logic_vector(15 downto 0); + signal RegBusC : std_logic_vector(15 downto 0); + signal RegAddrA_r : std_logic_vector(2 downto 0); + signal RegAddrA : std_logic_vector(2 downto 0); + signal RegAddrB_r : std_logic_vector(2 downto 0); + signal RegAddrB : std_logic_vector(2 downto 0); + signal RegAddrC : std_logic_vector(2 downto 0); + signal RegWEH : std_logic; + signal RegWEL : std_logic; + signal Alternate : std_logic; + + -- Help Registers + signal TmpAddr : std_logic_vector(15 downto 0); -- Temporary address register + signal IR : std_logic_vector(7 downto 0); -- Instruction register + signal ISet : std_logic_vector(1 downto 0); -- Instruction set selector + signal RegBusA_r : std_logic_vector(15 downto 0); + + signal ID16 : signed(15 downto 0); + signal Save_Mux : std_logic_vector(7 downto 0); + + signal TState : unsigned(2 downto 0); + signal MCycle : std_logic_vector(2 downto 0); + signal IntE_FF1 : std_logic; + signal IntE_FF2 : std_logic; + signal Halt_FF : std_logic; + signal BusReq_s : std_logic; + signal BusAck : std_logic; + signal ClkEn : std_logic; + signal NMI_s : std_logic; + signal INT_s : std_logic; + signal IStatus : std_logic_vector(1 downto 0); + + signal DI_Reg : std_logic_vector(7 downto 0); + signal T_Res : std_logic; + signal XY_State : std_logic_vector(1 downto 0); + signal Pre_XY_F_M : std_logic_vector(2 downto 0); + signal NextIs_XY_Fetch : std_logic; + signal XY_Ind : std_logic; + signal No_BTR : std_logic; + signal BTR_r : std_logic; + signal Auto_Wait : std_logic; + signal Auto_Wait_t1 : std_logic; + signal Auto_Wait_t2 : std_logic; + signal IncDecZ : std_logic; + + -- ALU signals + signal BusB : std_logic_vector(7 downto 0); + signal BusA : std_logic_vector(7 downto 0); + signal ALU_Q : std_logic_vector(7 downto 0); + signal F_Out : std_logic_vector(7 downto 0); + + -- Registered micro code outputs + signal Read_To_Reg_r : std_logic_vector(4 downto 0); + signal Arith16_r : std_logic; + signal Z16_r : std_logic; + signal ALU_Op_r : std_logic_vector(3 downto 0); + signal Save_ALU_r : std_logic; + signal PreserveC_r : std_logic; + signal MCycles : std_logic_vector(2 downto 0); + + -- Micro code outputs + signal MCycles_d : std_logic_vector(2 downto 0); + signal TStates : std_logic_vector(2 downto 0); + signal IntCycle : std_logic; + signal NMICycle : std_logic; + signal Inc_PC : std_logic; + signal Inc_WZ : std_logic; + signal IncDec_16 : std_logic_vector(3 downto 0); + signal Prefix : std_logic_vector(1 downto 0); + signal Read_To_Acc : std_logic; + signal Read_To_Reg : std_logic; + signal Set_BusB_To : std_logic_vector(3 downto 0); + signal Set_BusA_To : std_logic_vector(3 downto 0); + signal ALU_Op : std_logic_vector(3 downto 0); + signal Save_ALU : std_logic; + signal PreserveC : std_logic; + signal Arith16 : std_logic; + signal Set_Addr_To : std_logic_vector(2 downto 0); + signal Jump : std_logic; + signal JumpE : std_logic; + signal JumpXY : std_logic; + signal Call : std_logic; + signal RstP : std_logic; + signal LDZ : std_logic; + signal LDW : std_logic; + signal LDSPHL : std_logic; + signal IORQ_i : std_logic; + signal Special_LD : std_logic_vector(2 downto 0); + signal ExchangeDH : std_logic; + signal ExchangeRp : std_logic; + signal ExchangeAF : std_logic; + signal ExchangeRS : std_logic; + signal I_DJNZ : std_logic; + signal I_CPL : std_logic; + signal I_CCF : std_logic; + signal I_SCF : std_logic; + signal I_RETN : std_logic; + signal I_BT : std_logic; + signal I_BC : std_logic; + signal I_BTR : std_logic; + signal I_RLD : std_logic; + signal I_RRD : std_logic; + signal I_INRC : std_logic; + signal SetDI : std_logic; + signal SetEI : std_logic; + signal IMode : std_logic_vector(1 downto 0); + signal Halt : std_logic; + +begin + + mcode : T80_MCode + generic map( + Mode => Mode, + Flag_C => Flag_C, + Flag_N => Flag_N, + Flag_P => Flag_P, + Flag_X => Flag_X, + Flag_H => Flag_H, + Flag_Y => Flag_Y, + Flag_Z => Flag_Z, + Flag_S => Flag_S) + port map( + IR => IR, + ISet => ISet, + MCycle => MCycle, + F => F, + NMICycle => NMICycle, + IntCycle => IntCycle, + MCycles => MCycles_d, + TStates => TStates, + Prefix => Prefix, + Inc_PC => Inc_PC, + Inc_WZ => Inc_WZ, + IncDec_16 => IncDec_16, + Read_To_Acc => Read_To_Acc, + Read_To_Reg => Read_To_Reg, + Set_BusB_To => Set_BusB_To, + Set_BusA_To => Set_BusA_To, + ALU_Op => ALU_Op, + Save_ALU => Save_ALU, + PreserveC => PreserveC, + Arith16 => Arith16, + Set_Addr_To => Set_Addr_To, + IORQ => IORQ_i, + Jump => Jump, + JumpE => JumpE, + JumpXY => JumpXY, + Call => Call, + RstP => RstP, + LDZ => LDZ, + LDW => LDW, + LDSPHL => LDSPHL, + Special_LD => Special_LD, + ExchangeDH => ExchangeDH, + ExchangeRp => ExchangeRp, + ExchangeAF => ExchangeAF, + ExchangeRS => ExchangeRS, + I_DJNZ => I_DJNZ, + I_CPL => I_CPL, + I_CCF => I_CCF, + I_SCF => I_SCF, + I_RETN => I_RETN, + I_BT => I_BT, + I_BC => I_BC, + I_BTR => I_BTR, + I_RLD => I_RLD, + I_RRD => I_RRD, + I_INRC => I_INRC, + SetDI => SetDI, + SetEI => SetEI, + IMode => IMode, + Halt => Halt, + NoRead => NoRead, + Write => Write); + + alu : T80_ALU + generic map( + Mode => Mode, + Flag_C => Flag_C, + Flag_N => Flag_N, + Flag_P => Flag_P, + Flag_X => Flag_X, + Flag_H => Flag_H, + Flag_Y => Flag_Y, + Flag_Z => Flag_Z, + Flag_S => Flag_S) + port map( + Arith16 => Arith16_r, + Z16 => Z16_r, + ALU_Op => ALU_Op_r, + IR => IR(5 downto 0), + ISet => ISet, + BusA => BusA, + BusB => BusB, + F_In => F, + Q => ALU_Q, + F_Out => F_Out); + + ClkEn <= CEN and not BusAck; + + T_Res <= '1' when TState = unsigned(TStates) else '0'; + + NextIs_XY_Fetch <= '1' when XY_State /= "00" and XY_Ind = '0' and + ((Set_Addr_To = aXY) or + (MCycle = "001" and IR = "11001011") or + (MCycle = "001" and IR = "00110110")) else '0'; + + Save_Mux <= BusB when ExchangeRp = '1' else + DI_Reg when Save_ALU_r = '0' else + ALU_Q; + + process (RESET_n, CLK_n) + begin + if RESET_n = '0' then + PC <= (others => '0'); -- Program Counter + A <= (others => '0'); + TmpAddr <= (others => '0'); + IR <= "00000000"; + ISet <= "00"; + XY_State <= "00"; + IStatus <= "00"; + MCycles <= "000"; + DO <= "00000000"; + + ACC <= (others => '1'); + F <= (others => '1'); + Ap <= (others => '1'); + Fp <= (others => '1'); + I <= (others => '0'); + R <= (others => '0'); + SP <= (others => '1'); + Alternate <= '0'; + + Read_To_Reg_r <= "00000"; + F <= (others => '1'); + Arith16_r <= '0'; + BTR_r <= '0'; + Z16_r <= '0'; + ALU_Op_r <= "0000"; + Save_ALU_r <= '0'; + PreserveC_r <= '0'; + XY_Ind <= '0'; + + elsif CLK_n'event and CLK_n = '1' then + + if ClkEn = '1' then + + ALU_Op_r <= "0000"; + Save_ALU_r <= '0'; + Read_To_Reg_r <= "00000"; + + MCycles <= MCycles_d; + + if IMode /= "11" then + IStatus <= IMode; + end if; + + Arith16_r <= Arith16; + PreserveC_r <= PreserveC; + if ISet = "10" and ALU_OP(2) = '0' and ALU_OP(0) = '1' and MCycle = "011" then + Z16_r <= '1'; + else + Z16_r <= '0'; + end if; + + if MCycle = "001" and TState(2) = '0' then + -- MCycle = 1 and TState = 1, 2, or 3 + + if TState = 2 and Wait_n = '1' then + if Mode < 2 then + A(7 downto 0) <= std_logic_vector(R); + A(15 downto 8) <= I; + R(6 downto 0) <= R(6 downto 0) + 1; + end if; + + if Jump = '0' and Call = '0' and NMICycle = '0' and IntCycle = '0' and not (Halt_FF = '1' or Halt = '1') then + PC <= PC + 1; + end if; + + if IntCycle = '1' and IStatus = "01" then + IR <= "11111111"; + elsif Halt_FF = '1' or (IntCycle = '1' and IStatus = "10") or NMICycle = '1' then + IR <= "00000000"; + else + IR <= DInst; + end if; + + ISet <= "00"; + if Prefix /= "00" then + if Prefix = "11" then + if IR(5) = '1' then + XY_State <= "10"; + else + XY_State <= "01"; + end if; + else + if Prefix = "10" then + XY_State <= "00"; + XY_Ind <= '0'; + end if; + ISet <= Prefix; + end if; + else + XY_State <= "00"; + XY_Ind <= '0'; + end if; + end if; + + else + -- either (MCycle > 1) OR (MCycle = 1 AND TState > 3) + + if MCycle = "110" then + XY_Ind <= '1'; + if Prefix = "01" then + ISet <= "01"; + end if; + end if; + + if T_Res = '1' then + BTR_r <= (I_BT or I_BC or I_BTR) and not No_BTR; + if Jump = '1' then + A(15 downto 8) <= DI_Reg; + A(7 downto 0) <= TmpAddr(7 downto 0); + PC(15 downto 8) <= unsigned(DI_Reg); + PC(7 downto 0) <= unsigned(TmpAddr(7 downto 0)); + elsif JumpXY = '1' then + A <= RegBusC; + PC <= unsigned(RegBusC); + elsif Call = '1' or RstP = '1' then + A <= TmpAddr; + PC <= unsigned(TmpAddr); + elsif MCycle = MCycles and NMICycle = '1' then + A <= "0000000001100110"; + PC <= "0000000001100110"; + elsif MCycle = "011" and IntCycle = '1' and IStatus = "10" then + A(15 downto 8) <= I; + A(7 downto 0) <= TmpAddr(7 downto 0); + PC(15 downto 8) <= unsigned(I); + PC(7 downto 0) <= unsigned(TmpAddr(7 downto 0)); + else + case Set_Addr_To is + when aXY => + if XY_State = "00" then + A <= RegBusC; + else + if NextIs_XY_Fetch = '1' then + A <= std_logic_vector(PC); + else + A <= TmpAddr; + end if; + end if; + when aIOA => + if Mode = 3 then + -- Memory map I/O on GBZ80 + A(15 downto 8) <= (others => '1'); + elsif Mode = 2 then + -- Duplicate I/O address on 8080 + A(15 downto 8) <= DI_Reg; + else + A(15 downto 8) <= ACC; + end if; + A(7 downto 0) <= DI_Reg; + when aSP => + A <= std_logic_vector(SP); + when aBC => + if Mode = 3 and IORQ_i = '1' then + -- Memory map I/O on GBZ80 + A(15 downto 8) <= (others => '1'); + A(7 downto 0) <= RegBusC(7 downto 0); + else + A <= RegBusC; + end if; + when aDE => + A <= RegBusC; + when aZI => + if Inc_WZ = '1' then + A <= std_logic_vector(unsigned(TmpAddr) + 1); + else + A(15 downto 8) <= DI_Reg; + A(7 downto 0) <= TmpAddr(7 downto 0); + end if; + when others => + A <= std_logic_vector(PC); + end case; + end if; + + Save_ALU_r <= Save_ALU; + ALU_Op_r <= ALU_Op; + + if I_CPL = '1' then + -- CPL + ACC <= not ACC; + F(Flag_Y) <= not ACC(5); + F(Flag_H) <= '1'; + F(Flag_X) <= not ACC(3); + F(Flag_N) <= '1'; + end if; + if I_CCF = '1' then + -- CCF + F(Flag_C) <= not F(Flag_C); + F(Flag_Y) <= ACC(5); + F(Flag_H) <= F(Flag_C); + F(Flag_X) <= ACC(3); + F(Flag_N) <= '0'; + end if; + if I_SCF = '1' then + -- SCF + F(Flag_C) <= '1'; + F(Flag_Y) <= ACC(5); + F(Flag_H) <= '0'; + F(Flag_X) <= ACC(3); + F(Flag_N) <= '0'; + end if; + end if; + + if TState = 2 and Wait_n = '1' then + if ISet = "01" and MCycle = "111" then + IR <= DInst; + end if; + if JumpE = '1' then + PC <= unsigned(signed(PC) + signed(DI_Reg)); + elsif Inc_PC = '1' then + PC <= PC + 1; + end if; + if BTR_r = '1' then + PC <= PC - 2; + end if; + if RstP = '1' then + TmpAddr <= (others =>'0'); + TmpAddr(5 downto 3) <= IR(5 downto 3); + end if; + end if; + if TState = 3 and MCycle = "110" then + TmpAddr <= std_logic_vector(signed(RegBusC) + signed(DI_Reg)); + end if; + + if (TState = 2 and Wait_n = '1') or (TState = 4 and MCycle = "001") then + if IncDec_16(2 downto 0) = "111" then + if IncDec_16(3) = '1' then + SP <= SP - 1; + else + SP <= SP + 1; + end if; + end if; + end if; + + if LDSPHL = '1' then + SP <= unsigned(RegBusC); + end if; + if ExchangeAF = '1' then + Ap <= ACC; + ACC <= Ap; + Fp <= F; + F <= Fp; + end if; + if ExchangeRS = '1' then + Alternate <= not Alternate; + end if; + end if; + + if TState = 3 then + if LDZ = '1' then + TmpAddr(7 downto 0) <= DI_Reg; + end if; + if LDW = '1' then + TmpAddr(15 downto 8) <= DI_Reg; + end if; + + if Special_LD(2) = '1' then + case Special_LD(1 downto 0) is + when "00" => + ACC <= I; + F(Flag_P) <= IntE_FF2; + when "01" => + ACC <= std_logic_vector(R); + F(Flag_P) <= IntE_FF2; + when "10" => + I <= ACC; + when others => + R <= unsigned(ACC); + end case; + end if; + end if; + + if (I_DJNZ = '0' and Save_ALU_r = '1') or ALU_Op_r = "1001" then + if Mode = 3 then + F(6) <= F_Out(6); + F(5) <= F_Out(5); + F(7) <= F_Out(7); + if PreserveC_r = '0' then + F(4) <= F_Out(4); + end if; + else + F(7 downto 1) <= F_Out(7 downto 1); + if PreserveC_r = '0' then + F(Flag_C) <= F_Out(0); + end if; + end if; + end if; + if T_Res = '1' and I_INRC = '1' then + F(Flag_H) <= '0'; + F(Flag_N) <= '0'; + if DI_Reg(7 downto 0) = "00000000" then + F(Flag_Z) <= '1'; + else + F(Flag_Z) <= '0'; + end if; + F(Flag_S) <= DI_Reg(7); + F(Flag_P) <= not (DI_Reg(0) xor DI_Reg(1) xor DI_Reg(2) xor DI_Reg(3) xor + DI_Reg(4) xor DI_Reg(5) xor DI_Reg(6) xor DI_Reg(7)); + end if; + + if TState = 1 and Auto_Wait_t1 = '0' then + DO <= BusB; + if I_RLD = '1' then + DO(3 downto 0) <= BusA(3 downto 0); + DO(7 downto 4) <= BusB(3 downto 0); + end if; + if I_RRD = '1' then + DO(3 downto 0) <= BusB(7 downto 4); + DO(7 downto 4) <= BusA(3 downto 0); + end if; + end if; + + if T_Res = '1' then + Read_To_Reg_r(3 downto 0) <= Set_BusA_To; + Read_To_Reg_r(4) <= Read_To_Reg; + if Read_To_Acc = '1' then + Read_To_Reg_r(3 downto 0) <= "0111"; + Read_To_Reg_r(4) <= '1'; + end if; + end if; + + if TState = 1 and I_BT = '1' then + F(Flag_X) <= ALU_Q(3); + F(Flag_Y) <= ALU_Q(1); + F(Flag_H) <= '0'; + F(Flag_N) <= '0'; + end if; + if I_BC = '1' or I_BT = '1' then + F(Flag_P) <= IncDecZ; + end if; + + if (TState = 1 and Save_ALU_r = '0' and Auto_Wait_t1 = '0') or + (Save_ALU_r = '1' and ALU_OP_r /= "0111") then + case Read_To_Reg_r is + when "10111" => + ACC <= Save_Mux; + when "10110" => + DO <= Save_Mux; + when "11000" => + SP(7 downto 0) <= unsigned(Save_Mux); + when "11001" => + SP(15 downto 8) <= unsigned(Save_Mux); + when "11011" => + F <= Save_Mux; + when others => + end case; + end if; + + end if; + + end if; + + end process; + +--------------------------------------------------------------------------- +-- +-- BC('), DE('), HL('), IX and IY +-- +--------------------------------------------------------------------------- + process (CLK_n) + begin + if CLK_n'event and CLK_n = '1' then + if ClkEn = '1' then + -- Bus A / Write + RegAddrA_r <= Alternate & Set_BusA_To(2 downto 1); + if XY_Ind = '0' and XY_State /= "00" and Set_BusA_To(2 downto 1) = "10" then + RegAddrA_r <= XY_State(1) & "11"; + end if; + + -- Bus B + RegAddrB_r <= Alternate & Set_BusB_To(2 downto 1); + if XY_Ind = '0' and XY_State /= "00" and Set_BusB_To(2 downto 1) = "10" then + RegAddrB_r <= XY_State(1) & "11"; + end if; + + -- Address from register + RegAddrC <= Alternate & Set_Addr_To(1 downto 0); + -- Jump (HL), LD SP,HL + if (JumpXY = '1' or LDSPHL = '1') then + RegAddrC <= Alternate & "10"; + end if; + if ((JumpXY = '1' or LDSPHL = '1') and XY_State /= "00") or (MCycle = "110") then + RegAddrC <= XY_State(1) & "11"; + end if; + + if I_DJNZ = '1' and Save_ALU_r = '1' and Mode < 2 then + IncDecZ <= F_Out(Flag_Z); + end if; + if (TState = 2 or (TState = 3 and MCycle = "001")) and IncDec_16(2 downto 0) = "100" then + if ID16 = 0 then + IncDecZ <= '0'; + else + IncDecZ <= '1'; + end if; + end if; + + RegBusA_r <= RegBusA; + end if; + end if; + end process; + + RegAddrA <= + -- 16 bit increment/decrement + Alternate & IncDec_16(1 downto 0) when (TState = 2 or + (TState = 3 and MCycle = "001" and IncDec_16(2) = '1')) and XY_State = "00" else + XY_State(1) & "11" when (TState = 2 or + (TState = 3 and MCycle = "001" and IncDec_16(2) = '1')) and IncDec_16(1 downto 0) = "10" else + -- EX HL,DL + Alternate & "10" when ExchangeDH = '1' and TState = 3 else + Alternate & "01" when ExchangeDH = '1' and TState = 4 else + -- Bus A / Write + RegAddrA_r; + + RegAddrB <= + -- EX HL,DL + Alternate & "01" when ExchangeDH = '1' and TState = 3 else + -- Bus B + RegAddrB_r; + + ID16 <= signed(RegBusA) - 1 when IncDec_16(3) = '1' else + signed(RegBusA) + 1; + + process (Save_ALU_r, Auto_Wait_t1, ALU_OP_r, Read_To_Reg_r, + ExchangeDH, IncDec_16, MCycle, TState, Wait_n) + begin + RegWEH <= '0'; + RegWEL <= '0'; + if (TState = 1 and Save_ALU_r = '0' and Auto_Wait_t1 = '0') or + (Save_ALU_r = '1' and ALU_OP_r /= "0111") then + case Read_To_Reg_r is + when "10000" | "10001" | "10010" | "10011" | "10100" | "10101" => + RegWEH <= not Read_To_Reg_r(0); + RegWEL <= Read_To_Reg_r(0); + when others => + end case; + end if; + + if ExchangeDH = '1' and (TState = 3 or TState = 4) then + RegWEH <= '1'; + RegWEL <= '1'; + end if; + + if IncDec_16(2) = '1' and ((TState = 2 and Wait_n = '1' and MCycle /= "001") or (TState = 3 and MCycle = "001")) then + case IncDec_16(1 downto 0) is + when "00" | "01" | "10" => + RegWEH <= '1'; + RegWEL <= '1'; + when others => + end case; + end if; + end process; + + process (Save_Mux, RegBusB, RegBusA_r, ID16, + ExchangeDH, IncDec_16, MCycle, TState, Wait_n) + begin + RegDIH <= Save_Mux; + RegDIL <= Save_Mux; + + if ExchangeDH = '1' and TState = 3 then + RegDIH <= RegBusB(15 downto 8); + RegDIL <= RegBusB(7 downto 0); + end if; + if ExchangeDH = '1' and TState = 4 then + RegDIH <= RegBusA_r(15 downto 8); + RegDIL <= RegBusA_r(7 downto 0); + end if; + + if IncDec_16(2) = '1' and ((TState = 2 and MCycle /= "001") or (TState = 3 and MCycle = "001")) then + RegDIH <= std_logic_vector(ID16(15 downto 8)); + RegDIL <= std_logic_vector(ID16(7 downto 0)); + end if; + end process; + + Regs : T80_Reg + port map( + Clk => CLK_n, + CEN => ClkEn, + WEH => RegWEH, + WEL => RegWEL, + AddrA => RegAddrA, + AddrB => RegAddrB, + AddrC => RegAddrC, + DIH => RegDIH, + DIL => RegDIL, + DOAH => RegBusA(15 downto 8), + DOAL => RegBusA(7 downto 0), + DOBH => RegBusB(15 downto 8), + DOBL => RegBusB(7 downto 0), + DOCH => RegBusC(15 downto 8), + DOCL => RegBusC(7 downto 0)); + +--------------------------------------------------------------------------- +-- +-- Buses +-- +--------------------------------------------------------------------------- + process (CLK_n) + begin + if CLK_n'event and CLK_n = '1' then + if ClkEn = '1' then + case Set_BusB_To is + when "0111" => + BusB <= ACC; + when "0000" | "0001" | "0010" | "0011" | "0100" | "0101" => + if Set_BusB_To(0) = '1' then + BusB <= RegBusB(7 downto 0); + else + BusB <= RegBusB(15 downto 8); + end if; + when "0110" => + BusB <= DI_Reg; + when "1000" => + BusB <= std_logic_vector(SP(7 downto 0)); + when "1001" => + BusB <= std_logic_vector(SP(15 downto 8)); + when "1010" => + BusB <= "00000001"; + when "1011" => + BusB <= F; + when "1100" => + BusB <= std_logic_vector(PC(7 downto 0)); + when "1101" => + BusB <= std_logic_vector(PC(15 downto 8)); + when "1110" => + BusB <= "00000000"; + when others => + BusB <= "--------"; + end case; + + case Set_BusA_To is + when "0111" => + BusA <= ACC; + when "0000" | "0001" | "0010" | "0011" | "0100" | "0101" => + if Set_BusA_To(0) = '1' then + BusA <= RegBusA(7 downto 0); + else + BusA <= RegBusA(15 downto 8); + end if; + when "0110" => + BusA <= DI_Reg; + when "1000" => + BusA <= std_logic_vector(SP(7 downto 0)); + when "1001" => + BusA <= std_logic_vector(SP(15 downto 8)); + when "1010" => + BusA <= "00000000"; + when others => + BusB <= "--------"; + end case; + end if; + end if; + end process; + +--------------------------------------------------------------------------- +-- +-- Generate external control signals +-- +--------------------------------------------------------------------------- + process (RESET_n,CLK_n) + begin + if RESET_n = '0' then + RFSH_n <= '1'; + elsif CLK_n'event and CLK_n = '1' then + if CEN = '1' then + if MCycle = "001" and ((TState = 2 and Wait_n = '1') or TState = 3) then + RFSH_n <= '0'; + else + RFSH_n <= '1'; + end if; + end if; + end if; + end process; + + MC <= std_logic_vector(MCycle); + TS <= std_logic_vector(TState); + DI_Reg <= DI; + HALT_n <= not Halt_FF; + BUSAK_n <= not BusAck; + IntCycle_n <= not IntCycle; + IntE <= IntE_FF1; + IORQ <= IORQ_i; + Stop <= I_DJNZ; + +------------------------------------------------------------------------- +-- +-- Syncronise inputs +-- +------------------------------------------------------------------------- + process (RESET_n, CLK_n) + variable OldNMI_n : std_logic; + begin + if RESET_n = '0' then + BusReq_s <= '0'; + INT_s <= '0'; + NMI_s <= '0'; + OldNMI_n := '0'; + elsif CLK_n'event and CLK_n = '1' then + if CEN = '1' then + BusReq_s <= not BUSRQ_n; + INT_s <= not INT_n; + if NMICycle = '1' then + NMI_s <= '0'; + elsif NMI_n = '0' and OldNMI_n = '1' then + NMI_s <= '1'; + end if; + OldNMI_n := NMI_n; + end if; + end if; + end process; + +------------------------------------------------------------------------- +-- +-- Main state machine +-- +------------------------------------------------------------------------- + process (RESET_n, CLK_n) + begin + if RESET_n = '0' then + MCycle <= "001"; + TState <= "000"; + Pre_XY_F_M <= "000"; + Halt_FF <= '0'; + BusAck <= '0'; + NMICycle <= '0'; + IntCycle <= '0'; + IntE_FF1 <= '0'; + IntE_FF2 <= '0'; + No_BTR <= '0'; + Auto_Wait_t1 <= '0'; + Auto_Wait_t2 <= '0'; + M1_n <= '1'; + elsif CLK_n'event and CLK_n = '1' then + if CEN = '1' then + if T_Res = '1' then + Auto_Wait_t1 <= '0'; + else + Auto_Wait_t1 <= Auto_Wait or IORQ_i; + end if; + Auto_Wait_t2 <= Auto_Wait_t1; + No_BTR <= (I_BT and (not IR(4) or not F(Flag_P))) or + (I_BC and (not IR(4) or F(Flag_Z) or not F(Flag_P))) or + (I_BTR and (not IR(4) or F(Flag_Z))); + if TState = 2 then + if SetEI = '1' then + IntE_FF1 <= '1'; + IntE_FF2 <= '1'; + end if; + if I_RETN = '1' then + IntE_FF1 <= IntE_FF2; + end if; + end if; + if TState = 3 then + if SetDI = '1' then + IntE_FF1 <= '0'; + IntE_FF2 <= '0'; + end if; + end if; + if IntCycle = '1' or NMICycle = '1' then + Halt_FF <= '0'; + end if; + if MCycle = "001" and TState = 2 and Wait_n = '1' then + M1_n <= '1'; + end if; + if BusReq_s = '1' and BusAck = '1' then + else + BusAck <= '0'; + if TState = 2 and Wait_n = '0' then + elsif T_Res = '1' then + if Halt = '1' then + Halt_FF <= '1'; + end if; + if BusReq_s = '1' then + BusAck <= '1'; + else + TState <= "001"; + if NextIs_XY_Fetch = '1' then + MCycle <= "110"; + Pre_XY_F_M <= MCycle; + if IR = "00110110" and Mode = 0 then + Pre_XY_F_M <= "010"; + end if; + elsif (MCycle = "111") or + (MCycle = "110" and Mode = 1 and ISet /= "01") then + MCycle <= std_logic_vector(unsigned(Pre_XY_F_M) + 1); + elsif (MCycle = MCycles) or + No_BTR = '1' or + (MCycle = "010" and I_DJNZ = '1' and IncDecZ = '1') then + M1_n <= '0'; + MCycle <= "001"; + IntCycle <= '0'; + NMICycle <= '0'; + if NMI_s = '1' and Prefix = "00" then + NMICycle <= '1'; + IntE_FF1 <= '0'; + elsif (IntE_FF1 = '1' and INT_s = '1') and Prefix = "00" and SetEI = '0' then + IntCycle <= '1'; + IntE_FF1 <= '0'; + IntE_FF2 <= '0'; + end if; + else + MCycle <= std_logic_vector(unsigned(MCycle) + 1); + end if; + end if; + else + if (Auto_Wait = '1' and Auto_Wait_t2 = '0') nor + (IOWait = 1 and IORQ_i = '1' and Auto_Wait_t1 = '0') then + TState <= TState + 1; + end if; + end if; + end if; + if TState = 0 then + M1_n <= '0'; + end if; + end if; + end if; + end process; + + process (IntCycle, NMICycle, MCycle) + begin + Auto_Wait <= '0'; + if IntCycle = '1' or NMICycle = '1' then + if MCycle = "001" then + Auto_Wait <= '1'; + end if; + end if; + end process; + +end; diff --git a/Sega - SG1000/rtl/t80/T80_ALU.vhd b/Sega - SG1000/rtl/t80/T80_ALU.vhd new file mode 100644 index 00000000..86fddce7 --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80_ALU.vhd @@ -0,0 +1,351 @@ +-- +-- Z80 compatible microprocessor core +-- +-- Version : 0247 +-- +-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t80/ +-- +-- Limitations : +-- +-- File history : +-- +-- 0214 : Fixed mostly flags, only the block instructions now fail the zex regression test +-- +-- 0238 : Fixed zero flag for 16 bit SBC and ADC +-- +-- 0240 : Added GB operations +-- +-- 0242 : Cleanup +-- +-- 0247 : Cleanup +-- + +library IEEE; +use IEEE.std_logic_1164.all; +use IEEE.numeric_std.all; + +entity T80_ALU is + generic( + Mode : integer := 0; + Flag_C : integer := 0; + Flag_N : integer := 1; + Flag_P : integer := 2; + Flag_X : integer := 3; + Flag_H : integer := 4; + Flag_Y : integer := 5; + Flag_Z : integer := 6; + Flag_S : integer := 7 + ); + port( + Arith16 : in std_logic; + Z16 : in std_logic; + ALU_Op : in std_logic_vector(3 downto 0); + IR : in std_logic_vector(5 downto 0); + ISet : in std_logic_vector(1 downto 0); + BusA : in std_logic_vector(7 downto 0); + BusB : in std_logic_vector(7 downto 0); + F_In : in std_logic_vector(7 downto 0); + Q : out std_logic_vector(7 downto 0); + F_Out : out std_logic_vector(7 downto 0) + ); +end T80_ALU; + +architecture rtl of T80_ALU is + + procedure AddSub(A : std_logic_vector; + B : std_logic_vector; + Sub : std_logic; + Carry_In : std_logic; + signal Res : out std_logic_vector; + signal Carry : out std_logic) is + variable B_i : unsigned(A'length - 1 downto 0); + variable Res_i : unsigned(A'length + 1 downto 0); + begin + if Sub = '1' then + B_i := not unsigned(B); + else + B_i := unsigned(B); + end if; + Res_i := unsigned("0" & A & Carry_In) + unsigned("0" & B_i & "1"); + Carry <= Res_i(A'length + 1); + Res <= std_logic_vector(Res_i(A'length downto 1)); + end; + + -- AddSub variables (temporary signals) + signal UseCarry : std_logic; + signal Carry7_v : std_logic; + signal Overflow_v : std_logic; + signal HalfCarry_v : std_logic; + signal Carry_v : std_logic; + signal Q_v : std_logic_vector(7 downto 0); + + signal BitMask : std_logic_vector(7 downto 0); + +begin + + with IR(5 downto 3) select BitMask <= "00000001" when "000", + "00000010" when "001", + "00000100" when "010", + "00001000" when "011", + "00010000" when "100", + "00100000" when "101", + "01000000" when "110", + "10000000" when others; + + UseCarry <= not ALU_Op(2) and ALU_Op(0); + AddSub(BusA(3 downto 0), BusB(3 downto 0), ALU_Op(1), ALU_Op(1) xor (UseCarry and F_In(Flag_C)), Q_v(3 downto 0), HalfCarry_v); + AddSub(BusA(6 downto 4), BusB(6 downto 4), ALU_Op(1), HalfCarry_v, Q_v(6 downto 4), Carry7_v); + AddSub(BusA(7 downto 7), BusB(7 downto 7), ALU_Op(1), Carry7_v, Q_v(7 downto 7), Carry_v); + OverFlow_v <= Carry_v xor Carry7_v; + + process (Arith16, ALU_OP, F_In, BusA, BusB, IR, Q_v, Carry_v, HalfCarry_v, OverFlow_v, BitMask, ISet, Z16) + variable Q_t : std_logic_vector(7 downto 0); + variable DAA_Q : unsigned(8 downto 0); + begin + Q_t := "--------"; + F_Out <= F_In; + DAA_Q := "---------"; + case ALU_Op is + when "0000" | "0001" | "0010" | "0011" | "0100" | "0101" | "0110" | "0111" => + F_Out(Flag_N) <= '0'; + F_Out(Flag_C) <= '0'; + case ALU_OP(2 downto 0) is + when "000" | "001" => -- ADD, ADC + Q_t := Q_v; + F_Out(Flag_C) <= Carry_v; + F_Out(Flag_H) <= HalfCarry_v; + F_Out(Flag_P) <= OverFlow_v; + when "010" | "011" | "111" => -- SUB, SBC, CP + Q_t := Q_v; + F_Out(Flag_N) <= '1'; + F_Out(Flag_C) <= not Carry_v; + F_Out(Flag_H) <= not HalfCarry_v; + F_Out(Flag_P) <= OverFlow_v; + when "100" => -- AND + Q_t(7 downto 0) := BusA and BusB; + F_Out(Flag_H) <= '1'; + when "101" => -- XOR + Q_t(7 downto 0) := BusA xor BusB; + F_Out(Flag_H) <= '0'; + when others => -- OR "110" + Q_t(7 downto 0) := BusA or BusB; + F_Out(Flag_H) <= '0'; + end case; + if ALU_Op(2 downto 0) = "111" then -- CP + F_Out(Flag_X) <= BusB(3); + F_Out(Flag_Y) <= BusB(5); + else + F_Out(Flag_X) <= Q_t(3); + F_Out(Flag_Y) <= Q_t(5); + end if; + if Q_t(7 downto 0) = "00000000" then + F_Out(Flag_Z) <= '1'; + if Z16 = '1' then + F_Out(Flag_Z) <= F_In(Flag_Z); -- 16 bit ADC,SBC + end if; + else + F_Out(Flag_Z) <= '0'; + end if; + F_Out(Flag_S) <= Q_t(7); + case ALU_Op(2 downto 0) is + when "000" | "001" | "010" | "011" | "111" => -- ADD, ADC, SUB, SBC, CP + when others => + F_Out(Flag_P) <= not (Q_t(0) xor Q_t(1) xor Q_t(2) xor Q_t(3) xor + Q_t(4) xor Q_t(5) xor Q_t(6) xor Q_t(7)); + end case; + if Arith16 = '1' then + F_Out(Flag_S) <= F_In(Flag_S); + F_Out(Flag_Z) <= F_In(Flag_Z); + F_Out(Flag_P) <= F_In(Flag_P); + end if; + when "1100" => + -- DAA + F_Out(Flag_H) <= F_In(Flag_H); + F_Out(Flag_C) <= F_In(Flag_C); + DAA_Q(7 downto 0) := unsigned(BusA); + DAA_Q(8) := '0'; + if F_In(Flag_N) = '0' then + -- After addition + -- Alow > 9 or H = 1 + if DAA_Q(3 downto 0) > 9 or F_In(Flag_H) = '1' then + if (DAA_Q(3 downto 0) > 9) then + F_Out(Flag_H) <= '1'; + else + F_Out(Flag_H) <= '0'; + end if; + DAA_Q := DAA_Q + 6; + end if; + -- new Ahigh > 9 or C = 1 + if DAA_Q(8 downto 4) > 9 or F_In(Flag_C) = '1' then + DAA_Q := DAA_Q + 96; -- 0x60 + end if; + else + -- After subtraction + if DAA_Q(3 downto 0) > 9 or F_In(Flag_H) = '1' then + if DAA_Q(3 downto 0) > 5 then + F_Out(Flag_H) <= '0'; + end if; + DAA_Q(7 downto 0) := DAA_Q(7 downto 0) - 6; + end if; + if unsigned(BusA) > 153 or F_In(Flag_C) = '1' then + DAA_Q := DAA_Q - 352; -- 0x160 + end if; + end if; + F_Out(Flag_X) <= DAA_Q(3); + F_Out(Flag_Y) <= DAA_Q(5); + F_Out(Flag_C) <= F_In(Flag_C) or DAA_Q(8); + Q_t := std_logic_vector(DAA_Q(7 downto 0)); + if DAA_Q(7 downto 0) = "00000000" then + F_Out(Flag_Z) <= '1'; + else + F_Out(Flag_Z) <= '0'; + end if; + F_Out(Flag_S) <= DAA_Q(7); + F_Out(Flag_P) <= not (DAA_Q(0) xor DAA_Q(1) xor DAA_Q(2) xor DAA_Q(3) xor + DAA_Q(4) xor DAA_Q(5) xor DAA_Q(6) xor DAA_Q(7)); + when "1101" | "1110" => + -- RLD, RRD + Q_t(7 downto 4) := BusA(7 downto 4); + if ALU_Op(0) = '1' then + Q_t(3 downto 0) := BusB(7 downto 4); + else + Q_t(3 downto 0) := BusB(3 downto 0); + end if; + F_Out(Flag_H) <= '0'; + F_Out(Flag_N) <= '0'; + F_Out(Flag_X) <= Q_t(3); + F_Out(Flag_Y) <= Q_t(5); + if Q_t(7 downto 0) = "00000000" then + F_Out(Flag_Z) <= '1'; + else + F_Out(Flag_Z) <= '0'; + end if; + F_Out(Flag_S) <= Q_t(7); + F_Out(Flag_P) <= not (Q_t(0) xor Q_t(1) xor Q_t(2) xor Q_t(3) xor + Q_t(4) xor Q_t(5) xor Q_t(6) xor Q_t(7)); + when "1001" => + -- BIT + Q_t(7 downto 0) := BusB and BitMask; + F_Out(Flag_S) <= Q_t(7); + if Q_t(7 downto 0) = "00000000" then + F_Out(Flag_Z) <= '1'; + F_Out(Flag_P) <= '1'; + else + F_Out(Flag_Z) <= '0'; + F_Out(Flag_P) <= '0'; + end if; + F_Out(Flag_H) <= '1'; + F_Out(Flag_N) <= '0'; + F_Out(Flag_X) <= '0'; + F_Out(Flag_Y) <= '0'; + if IR(2 downto 0) /= "110" then + F_Out(Flag_X) <= BusB(3); + F_Out(Flag_Y) <= BusB(5); + end if; + when "1010" => + -- SET + Q_t(7 downto 0) := BusB or BitMask; + when "1011" => + -- RES + Q_t(7 downto 0) := BusB and not BitMask; + when "1000" => + -- ROT + case IR(5 downto 3) is + when "000" => -- RLC + Q_t(7 downto 1) := BusA(6 downto 0); + Q_t(0) := BusA(7); + F_Out(Flag_C) <= BusA(7); + when "010" => -- RL + Q_t(7 downto 1) := BusA(6 downto 0); + Q_t(0) := F_In(Flag_C); + F_Out(Flag_C) <= BusA(7); + when "001" => -- RRC + Q_t(6 downto 0) := BusA(7 downto 1); + Q_t(7) := BusA(0); + F_Out(Flag_C) <= BusA(0); + when "011" => -- RR + Q_t(6 downto 0) := BusA(7 downto 1); + Q_t(7) := F_In(Flag_C); + F_Out(Flag_C) <= BusA(0); + when "100" => -- SLA + Q_t(7 downto 1) := BusA(6 downto 0); + Q_t(0) := '0'; + F_Out(Flag_C) <= BusA(7); + when "110" => -- SLL (Undocumented) / SWAP + if Mode = 3 then + Q_t(7 downto 4) := BusA(3 downto 0); + Q_t(3 downto 0) := BusA(7 downto 4); + F_Out(Flag_C) <= '0'; + else + Q_t(7 downto 1) := BusA(6 downto 0); + Q_t(0) := '1'; + F_Out(Flag_C) <= BusA(7); + end if; + when "101" => -- SRA + Q_t(6 downto 0) := BusA(7 downto 1); + Q_t(7) := BusA(7); + F_Out(Flag_C) <= BusA(0); + when others => -- SRL + Q_t(6 downto 0) := BusA(7 downto 1); + Q_t(7) := '0'; + F_Out(Flag_C) <= BusA(0); + end case; + F_Out(Flag_H) <= '0'; + F_Out(Flag_N) <= '0'; + F_Out(Flag_X) <= Q_t(3); + F_Out(Flag_Y) <= Q_t(5); + F_Out(Flag_S) <= Q_t(7); + if Q_t(7 downto 0) = "00000000" then + F_Out(Flag_Z) <= '1'; + else + F_Out(Flag_Z) <= '0'; + end if; + F_Out(Flag_P) <= not (Q_t(0) xor Q_t(1) xor Q_t(2) xor Q_t(3) xor + Q_t(4) xor Q_t(5) xor Q_t(6) xor Q_t(7)); + if ISet = "00" then + F_Out(Flag_P) <= F_In(Flag_P); + F_Out(Flag_S) <= F_In(Flag_S); + F_Out(Flag_Z) <= F_In(Flag_Z); + end if; + when others => + null; + end case; + Q <= Q_t; + end process; + +end; diff --git a/Sega - SG1000/rtl/t80/T80_MCode.vhd b/Sega - SG1000/rtl/t80/T80_MCode.vhd new file mode 100644 index 00000000..7322994a --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80_MCode.vhd @@ -0,0 +1,1938 @@ +-- +-- Z80 compatible microprocessor core +-- +-- Version : 0242 +-- +-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t80/ +-- +-- Limitations : +-- +-- File history : +-- +-- 0208 : First complete release +-- +-- 0211 : Fixed IM 1 +-- +-- 0214 : Fixed mostly flags, only the block instructions now fail the zex regression test +-- +-- 0235 : Added IM 2 fix by Mike Johnson +-- +-- 0238 : Added NoRead signal +-- +-- 0238b: Fixed instruction timing for POP and DJNZ +-- +-- 0240 : Added (IX/IY+d) states, removed op-codes from mode 2 and added all remaining mode 3 op-codes +-- +-- 0242 : Fixed I/O instruction timing, cleanup +-- + +library IEEE; +use IEEE.std_logic_1164.all; +use IEEE.numeric_std.all; + +entity T80_MCode is + generic( + Mode : integer := 0; + Flag_C : integer := 0; + Flag_N : integer := 1; + Flag_P : integer := 2; + Flag_X : integer := 3; + Flag_H : integer := 4; + Flag_Y : integer := 5; + Flag_Z : integer := 6; + Flag_S : integer := 7 + ); + port( + IR : in std_logic_vector(7 downto 0); + ISet : in std_logic_vector(1 downto 0); + MCycle : in std_logic_vector(2 downto 0); + F : in std_logic_vector(7 downto 0); + NMICycle : in std_logic; + IntCycle : in std_logic; + MCycles : out std_logic_vector(2 downto 0); + TStates : out std_logic_vector(2 downto 0); + Prefix : out std_logic_vector(1 downto 0); -- None,BC,ED,DD/FD + Inc_PC : out std_logic; + Inc_WZ : out std_logic; + IncDec_16 : out std_logic_vector(3 downto 0); -- BC,DE,HL,SP 0 is inc + Read_To_Reg : out std_logic; + Read_To_Acc : out std_logic; + Set_BusA_To : out std_logic_vector(3 downto 0); -- B,C,D,E,H,L,DI/DB,A,SP(L),SP(M),0,F + Set_BusB_To : out std_logic_vector(3 downto 0); -- B,C,D,E,H,L,DI,A,SP(L),SP(M),1,F,PC(L),PC(M),0 + ALU_Op : out std_logic_vector(3 downto 0); + -- ADD, ADC, SUB, SBC, AND, XOR, OR, CP, ROT, BIT, SET, RES, DAA, RLD, RRD, None + Save_ALU : out std_logic; + PreserveC : out std_logic; + Arith16 : out std_logic; + Set_Addr_To : out std_logic_vector(2 downto 0); -- aNone,aXY,aIOA,aSP,aBC,aDE,aZI + IORQ : out std_logic; + Jump : out std_logic; + JumpE : out std_logic; + JumpXY : out std_logic; + Call : out std_logic; + RstP : out std_logic; + LDZ : out std_logic; + LDW : out std_logic; + LDSPHL : out std_logic; + Special_LD : out std_logic_vector(2 downto 0); -- A,I;A,R;I,A;R,A;None + ExchangeDH : out std_logic; + ExchangeRp : out std_logic; + ExchangeAF : out std_logic; + ExchangeRS : out std_logic; + I_DJNZ : out std_logic; + I_CPL : out std_logic; + I_CCF : out std_logic; + I_SCF : out std_logic; + I_RETN : out std_logic; + I_BT : out std_logic; + I_BC : out std_logic; + I_BTR : out std_logic; + I_RLD : out std_logic; + I_RRD : out std_logic; + I_INRC : out std_logic; + SetDI : out std_logic; + SetEI : out std_logic; + IMode : out std_logic_vector(1 downto 0); + Halt : out std_logic; + NoRead : out std_logic; + Write : out std_logic + ); +end T80_MCode; + +architecture rtl of T80_MCode is + + constant aNone : std_logic_vector(2 downto 0) := "111"; + constant aBC : std_logic_vector(2 downto 0) := "000"; + constant aDE : std_logic_vector(2 downto 0) := "001"; + constant aXY : std_logic_vector(2 downto 0) := "010"; + constant aIOA : std_logic_vector(2 downto 0) := "100"; + constant aSP : std_logic_vector(2 downto 0) := "101"; + constant aZI : std_logic_vector(2 downto 0) := "110"; +-- constant aNone : std_logic_vector(2 downto 0) := "000"; +-- constant aXY : std_logic_vector(2 downto 0) := "001"; +-- constant aIOA : std_logic_vector(2 downto 0) := "010"; +-- constant aSP : std_logic_vector(2 downto 0) := "011"; +-- constant aBC : std_logic_vector(2 downto 0) := "100"; +-- constant aDE : std_logic_vector(2 downto 0) := "101"; +-- constant aZI : std_logic_vector(2 downto 0) := "110"; + + function is_cc_true( + F : std_logic_vector(7 downto 0); + cc : bit_vector(2 downto 0) + ) return boolean is + begin + if Mode = 3 then + case cc is + when "000" => return F(7) = '0'; -- NZ + when "001" => return F(7) = '1'; -- Z + when "010" => return F(4) = '0'; -- NC + when "011" => return F(4) = '1'; -- C + when "100" => return false; + when "101" => return false; + when "110" => return false; + when "111" => return false; + end case; + else + case cc is + when "000" => return F(6) = '0'; -- NZ + when "001" => return F(6) = '1'; -- Z + when "010" => return F(0) = '0'; -- NC + when "011" => return F(0) = '1'; -- C + when "100" => return F(2) = '0'; -- PO + when "101" => return F(2) = '1'; -- PE + when "110" => return F(7) = '0'; -- P + when "111" => return F(7) = '1'; -- M + end case; + end if; + end; + +begin + + process (IR, ISet, MCycle, F, NMICycle, IntCycle) + variable DDD : std_logic_vector(2 downto 0); + variable SSS : std_logic_vector(2 downto 0); + variable DPair : std_logic_vector(1 downto 0); + variable IRB : bit_vector(7 downto 0); + begin + DDD := IR(5 downto 3); + SSS := IR(2 downto 0); + DPair := IR(5 downto 4); + IRB := to_bitvector(IR); + + MCycles <= "001"; + if MCycle = "001" then + TStates <= "100"; + else + TStates <= "011"; + end if; + Prefix <= "00"; + Inc_PC <= '0'; + Inc_WZ <= '0'; + IncDec_16 <= "0000"; + Read_To_Acc <= '0'; + Read_To_Reg <= '0'; + Set_BusB_To <= "0000"; + Set_BusA_To <= "0000"; + ALU_Op <= "0" & IR(5 downto 3); + Save_ALU <= '0'; + PreserveC <= '0'; + Arith16 <= '0'; + IORQ <= '0'; + Set_Addr_To <= aNone; + Jump <= '0'; + JumpE <= '0'; + JumpXY <= '0'; + Call <= '0'; + RstP <= '0'; + LDZ <= '0'; + LDW <= '0'; + LDSPHL <= '0'; + Special_LD <= "000"; + ExchangeDH <= '0'; + ExchangeRp <= '0'; + ExchangeAF <= '0'; + ExchangeRS <= '0'; + I_DJNZ <= '0'; + I_CPL <= '0'; + I_CCF <= '0'; + I_SCF <= '0'; + I_RETN <= '0'; + I_BT <= '0'; + I_BC <= '0'; + I_BTR <= '0'; + I_RLD <= '0'; + I_RRD <= '0'; + I_INRC <= '0'; + SetDI <= '0'; + SetEI <= '0'; + IMode <= "11"; + Halt <= '0'; + NoRead <= '0'; + Write <= '0'; + + case ISet is + when "00" => + +------------------------------------------------------------------------------ +-- +-- Unprefixed instructions +-- +------------------------------------------------------------------------------ + + case IRB is +-- 8 BIT LOAD GROUP + when "01000000"|"01000001"|"01000010"|"01000011"|"01000100"|"01000101"|"01000111" + |"01001000"|"01001001"|"01001010"|"01001011"|"01001100"|"01001101"|"01001111" + |"01010000"|"01010001"|"01010010"|"01010011"|"01010100"|"01010101"|"01010111" + |"01011000"|"01011001"|"01011010"|"01011011"|"01011100"|"01011101"|"01011111" + |"01100000"|"01100001"|"01100010"|"01100011"|"01100100"|"01100101"|"01100111" + |"01101000"|"01101001"|"01101010"|"01101011"|"01101100"|"01101101"|"01101111" + |"01111000"|"01111001"|"01111010"|"01111011"|"01111100"|"01111101"|"01111111" => + -- LD r,r' + Set_BusB_To(2 downto 0) <= SSS; + ExchangeRp <= '1'; + Set_BusA_To(2 downto 0) <= DDD; + Read_To_Reg <= '1'; + when "00000110"|"00001110"|"00010110"|"00011110"|"00100110"|"00101110"|"00111110" => + -- LD r,n + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Set_BusA_To(2 downto 0) <= DDD; + Read_To_Reg <= '1'; + when others => null; + end case; + when "01000110"|"01001110"|"01010110"|"01011110"|"01100110"|"01101110"|"01111110" => + -- LD r,(HL) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + when 2 => + Set_BusA_To(2 downto 0) <= DDD; + Read_To_Reg <= '1'; + when others => null; + end case; + when "01110000"|"01110001"|"01110010"|"01110011"|"01110100"|"01110101"|"01110111" => + -- LD (HL),r + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + Set_BusB_To(2 downto 0) <= SSS; + Set_BusB_To(3) <= '0'; + when 2 => + Write <= '1'; + when others => null; + end case; + when "00110110" => + -- LD (HL),n + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Set_Addr_To <= aXY; + Set_BusB_To(2 downto 0) <= SSS; + Set_BusB_To(3) <= '0'; + when 3 => + Write <= '1'; + when others => null; + end case; + when "00001010" => + -- LD A,(BC) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + when 2 => + Read_To_Acc <= '1'; + when others => null; + end case; + when "00011010" => + -- LD A,(DE) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aDE; + when 2 => + Read_To_Acc <= '1'; + when others => null; + end case; + when "00111010" => + if Mode = 3 then + -- LDD A,(HL) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + when 2 => + Read_To_Acc <= '1'; + IncDec_16 <= "1110"; + when others => null; + end case; + else + -- LD A,(nn) + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + when 4 => + Read_To_Acc <= '1'; + when others => null; + end case; + end if; + when "00000010" => + -- LD (BC),A + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + Set_BusB_To <= "0111"; + when 2 => + Write <= '1'; + when others => null; + end case; + when "00010010" => + -- LD (DE),A + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aDE; + Set_BusB_To <= "0111"; + when 2 => + Write <= '1'; + when others => null; + end case; + when "00110010" => + if Mode = 3 then + -- LDD (HL),A + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + Set_BusB_To <= "0111"; + when 2 => + Write <= '1'; + IncDec_16 <= "1110"; + when others => null; + end case; + else + -- LD (nn),A + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + Set_BusB_To <= "0111"; + when 4 => + Write <= '1'; + when others => null; + end case; + end if; + +-- 16 BIT LOAD GROUP + when "00000001"|"00010001"|"00100001"|"00110001" => + -- LD dd,nn + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Read_To_Reg <= '1'; + if DPAIR = "11" then + Set_BusA_To(3 downto 0) <= "1000"; + else + Set_BusA_To(2 downto 1) <= DPAIR; + Set_BusA_To(0) <= '1'; + end if; + when 3 => + Inc_PC <= '1'; + Read_To_Reg <= '1'; + if DPAIR = "11" then + Set_BusA_To(3 downto 0) <= "1001"; + else + Set_BusA_To(2 downto 1) <= DPAIR; + Set_BusA_To(0) <= '0'; + end if; + when others => null; + end case; + when "00101010" => + if Mode = 3 then + -- LDI A,(HL) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + when 2 => + Read_To_Acc <= '1'; + IncDec_16 <= "0110"; + when others => null; + end case; + else + -- LD HL,(nn) + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + LDW <= '1'; + when 4 => + Set_BusA_To(2 downto 0) <= "101"; -- L + Read_To_Reg <= '1'; + Inc_WZ <= '1'; + Set_Addr_To <= aZI; + when 5 => + Set_BusA_To(2 downto 0) <= "100"; -- H + Read_To_Reg <= '1'; + when others => null; + end case; + end if; + when "00100010" => + if Mode = 3 then + -- LDI (HL),A + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + Set_BusB_To <= "0111"; + when 2 => + Write <= '1'; + IncDec_16 <= "0110"; + when others => null; + end case; + else + -- LD (nn),HL + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + LDW <= '1'; + Set_BusB_To <= "0101"; -- L + when 4 => + Inc_WZ <= '1'; + Set_Addr_To <= aZI; + Write <= '1'; + Set_BusB_To <= "0100"; -- H + when 5 => + Write <= '1'; + when others => null; + end case; + end if; + when "11111001" => + -- LD SP,HL + TStates <= "110"; + LDSPHL <= '1'; + when "11000101"|"11010101"|"11100101"|"11110101" => + -- PUSH qq + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + TStates <= "101"; + IncDec_16 <= "1111"; + Set_Addr_TO <= aSP; + if DPAIR = "11" then + Set_BusB_To <= "0111"; + else + Set_BusB_To(2 downto 1) <= DPAIR; + Set_BusB_To(0) <= '0'; + Set_BusB_To(3) <= '0'; + end if; + when 2 => + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + if DPAIR = "11" then + Set_BusB_To <= "1011"; + else + Set_BusB_To(2 downto 1) <= DPAIR; + Set_BusB_To(0) <= '1'; + Set_BusB_To(3) <= '0'; + end if; + Write <= '1'; + when 3 => + Write <= '1'; + when others => null; + end case; + when "11000001"|"11010001"|"11100001"|"11110001" => + -- POP qq + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aSP; + when 2 => + IncDec_16 <= "0111"; + Set_Addr_To <= aSP; + Read_To_Reg <= '1'; + if DPAIR = "11" then + Set_BusA_To(3 downto 0) <= "1011"; + else + Set_BusA_To(2 downto 1) <= DPAIR; + Set_BusA_To(0) <= '1'; + end if; + when 3 => + IncDec_16 <= "0111"; + Read_To_Reg <= '1'; + if DPAIR = "11" then + Set_BusA_To(3 downto 0) <= "0111"; + else + Set_BusA_To(2 downto 1) <= DPAIR; + Set_BusA_To(0) <= '0'; + end if; + when others => null; + end case; + +-- EXCHANGE, BLOCK TRANSFER AND SEARCH GROUP + when "11101011" => + if Mode /= 3 then + -- EX DE,HL + ExchangeDH <= '1'; + end if; + when "00001000" => + if Mode = 3 then + -- LD (nn),SP + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + LDW <= '1'; + Set_BusB_To <= "1000"; + when 4 => + Inc_WZ <= '1'; + Set_Addr_To <= aZI; + Write <= '1'; + Set_BusB_To <= "1001"; + when 5 => + Write <= '1'; + when others => null; + end case; + elsif Mode < 2 then + -- EX AF,AF' + ExchangeAF <= '1'; + end if; + when "11011001" => + if Mode = 3 then + -- RETI + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_TO <= aSP; + when 2 => + IncDec_16 <= "0111"; + Set_Addr_To <= aSP; + LDZ <= '1'; + when 3 => + Jump <= '1'; + IncDec_16 <= "0111"; + I_RETN <= '1'; + SetEI <= '1'; + when others => null; + end case; + elsif Mode < 2 then + -- EXX + ExchangeRS <= '1'; + end if; + when "11100011" => + if Mode /= 3 then + -- EX (SP),HL + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aSP; + when 2 => + Read_To_Reg <= '1'; + Set_BusA_To <= "0101"; + Set_BusB_To <= "0101"; + Set_Addr_To <= aSP; + when 3 => + IncDec_16 <= "0111"; + Set_Addr_To <= aSP; + TStates <= "100"; + Write <= '1'; + when 4 => + Read_To_Reg <= '1'; + Set_BusA_To <= "0100"; + Set_BusB_To <= "0100"; + Set_Addr_To <= aSP; + when 5 => + IncDec_16 <= "1111"; + TStates <= "101"; + Write <= '1'; + when others => null; + end case; + end if; + +-- 8 BIT ARITHMETIC AND LOGICAL GROUP + when "10000000"|"10000001"|"10000010"|"10000011"|"10000100"|"10000101"|"10000111" + |"10001000"|"10001001"|"10001010"|"10001011"|"10001100"|"10001101"|"10001111" + |"10010000"|"10010001"|"10010010"|"10010011"|"10010100"|"10010101"|"10010111" + |"10011000"|"10011001"|"10011010"|"10011011"|"10011100"|"10011101"|"10011111" + |"10100000"|"10100001"|"10100010"|"10100011"|"10100100"|"10100101"|"10100111" + |"10101000"|"10101001"|"10101010"|"10101011"|"10101100"|"10101101"|"10101111" + |"10110000"|"10110001"|"10110010"|"10110011"|"10110100"|"10110101"|"10110111" + |"10111000"|"10111001"|"10111010"|"10111011"|"10111100"|"10111101"|"10111111" => + -- ADD A,r + -- ADC A,r + -- SUB A,r + -- SBC A,r + -- AND A,r + -- OR A,r + -- XOR A,r + -- CP A,r + Set_BusB_To(2 downto 0) <= SSS; + Set_BusA_To(2 downto 0) <= "111"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + when "10000110"|"10001110"|"10010110"|"10011110"|"10100110"|"10101110"|"10110110"|"10111110" => + -- ADD A,(HL) + -- ADC A,(HL) + -- SUB A,(HL) + -- SBC A,(HL) + -- AND A,(HL) + -- OR A,(HL) + -- XOR A,(HL) + -- CP A,(HL) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + when 2 => + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusB_To(2 downto 0) <= SSS; + Set_BusA_To(2 downto 0) <= "111"; + when others => null; + end case; + when "11000110"|"11001110"|"11010110"|"11011110"|"11100110"|"11101110"|"11110110"|"11111110" => + -- ADD A,n + -- ADC A,n + -- SUB A,n + -- SBC A,n + -- AND A,n + -- OR A,n + -- XOR A,n + -- CP A,n + MCycles <= "010"; + if MCycle = "010" then + Inc_PC <= '1'; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusB_To(2 downto 0) <= SSS; + Set_BusA_To(2 downto 0) <= "111"; + end if; + when "00000100"|"00001100"|"00010100"|"00011100"|"00100100"|"00101100"|"00111100" => + -- INC r + Set_BusB_To <= "1010"; + Set_BusA_To(2 downto 0) <= DDD; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + PreserveC <= '1'; + ALU_Op <= "0000"; + when "00110100" => + -- INC (HL) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + when 2 => + TStates <= "100"; + Set_Addr_To <= aXY; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + PreserveC <= '1'; + ALU_Op <= "0000"; + Set_BusB_To <= "1010"; + Set_BusA_To(2 downto 0) <= DDD; + when 3 => + Write <= '1'; + when others => null; + end case; + when "00000101"|"00001101"|"00010101"|"00011101"|"00100101"|"00101101"|"00111101" => + -- DEC r + Set_BusB_To <= "1010"; + Set_BusA_To(2 downto 0) <= DDD; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + PreserveC <= '1'; + ALU_Op <= "0010"; + when "00110101" => + -- DEC (HL) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + when 2 => + TStates <= "100"; + Set_Addr_To <= aXY; + ALU_Op <= "0010"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + PreserveC <= '1'; + Set_BusB_To <= "1010"; + Set_BusA_To(2 downto 0) <= DDD; + when 3 => + Write <= '1'; + when others => null; + end case; + +-- GENERAL PURPOSE ARITHMETIC AND CPU CONTROL GROUPS + when "00100111" => + -- DAA + Set_BusA_To(2 downto 0) <= "111"; + Read_To_Reg <= '1'; + ALU_Op <= "1100"; + Save_ALU <= '1'; + when "00101111" => + -- CPL + I_CPL <= '1'; + when "00111111" => + -- CCF + I_CCF <= '1'; + when "00110111" => + -- SCF + I_SCF <= '1'; + when "00000000" => + if NMICycle = '1' then + -- NMI + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + TStates <= "101"; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1101"; + when 2 => + TStates <= "100"; + Write <= '1'; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1100"; + when 3 => + TStates <= "100"; + Write <= '1'; + when others => null; + end case; + elsif IntCycle = '1' then + -- INT (IM 2) + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 1 => + LDZ <= '1'; + TStates <= "101"; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1101"; + when 2 => + TStates <= "100"; + Write <= '1'; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1100"; + when 3 => + TStates <= "100"; + Write <= '1'; + when 4 => + Inc_PC <= '1'; + LDZ <= '1'; + when 5 => + Jump <= '1'; + when others => null; + end case; + else + -- NOP + end if; + when "01110110" => + -- HALT + Halt <= '1'; + when "11110011" => + -- DI + SetDI <= '1'; + when "11111011" => + -- EI + SetEI <= '1'; + +-- 16 BIT ARITHMETIC GROUP + when "00001001"|"00011001"|"00101001"|"00111001" => + -- ADD HL,ss + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + NoRead <= '1'; + ALU_Op <= "0000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusA_To(2 downto 0) <= "101"; + case to_integer(unsigned(IR(5 downto 4))) is + when 0|1|2 => + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + Set_BusB_To(0) <= '1'; + when others => + Set_BusB_To <= "1000"; + end case; + TStates <= "100"; + Arith16 <= '1'; + when 3 => + NoRead <= '1'; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + ALU_Op <= "0001"; + Set_BusA_To(2 downto 0) <= "100"; + case to_integer(unsigned(IR(5 downto 4))) is + when 0|1|2 => + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + when others => + Set_BusB_To <= "1001"; + end case; + Arith16 <= '1'; + when others => + end case; + when "00000011"|"00010011"|"00100011"|"00110011" => + -- INC ss + TStates <= "110"; + IncDec_16(3 downto 2) <= "01"; + IncDec_16(1 downto 0) <= DPair; + when "00001011"|"00011011"|"00101011"|"00111011" => + -- DEC ss + TStates <= "110"; + IncDec_16(3 downto 2) <= "11"; + IncDec_16(1 downto 0) <= DPair; + +-- ROTATE AND SHIFT GROUP + when "00000111" + -- RLCA + |"00010111" + -- RLA + |"00001111" + -- RRCA + |"00011111" => + -- RRA + Set_BusA_To(2 downto 0) <= "111"; + ALU_Op <= "1000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + +-- JUMP GROUP + when "11000011" => + -- JP nn + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Inc_PC <= '1'; + Jump <= '1'; + when others => null; + end case; + when "11000010"|"11001010"|"11010010"|"11011010"|"11100010"|"11101010"|"11110010"|"11111010" => + if IR(5) = '1' and Mode = 3 then + case IRB(4 downto 3) is + when "00" => + -- LD ($FF00+C),A + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + Set_BusB_To <= "0111"; + when 2 => + Write <= '1'; + IORQ <= '1'; + when others => + end case; + when "01" => + -- LD (nn),A + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + Set_BusB_To <= "0111"; + when 4 => + Write <= '1'; + when others => null; + end case; + when "10" => + -- LD A,($FF00+C) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + when 2 => + Read_To_Acc <= '1'; + IORQ <= '1'; + when others => + end case; + when "11" => + -- LD A,(nn) + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + when 4 => + Read_To_Acc <= '1'; + when others => null; + end case; + end case; + else + -- JP cc,nn + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Inc_PC <= '1'; + if is_cc_true(F, to_bitvector(IR(5 downto 3))) then + Jump <= '1'; + end if; + when others => null; + end case; + end if; + when "00011000" => + if Mode /= 2 then + -- JR e + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + when 3 => + NoRead <= '1'; + JumpE <= '1'; + TStates <= "101"; + when others => null; + end case; + end if; + when "00111000" => + if Mode /= 2 then + -- JR C,e + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + if F(Flag_C) = '0' then + MCycles <= "010"; + end if; + when 3 => + NoRead <= '1'; + JumpE <= '1'; + TStates <= "101"; + when others => null; + end case; + end if; + when "00110000" => + if Mode /= 2 then + -- JR NC,e + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + if F(Flag_C) = '1' then + MCycles <= "010"; + end if; + when 3 => + NoRead <= '1'; + JumpE <= '1'; + TStates <= "101"; + when others => null; + end case; + end if; + when "00101000" => + if Mode /= 2 then + -- JR Z,e + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + if F(Flag_Z) = '0' then + MCycles <= "010"; + end if; + when 3 => + NoRead <= '1'; + JumpE <= '1'; + TStates <= "101"; + when others => null; + end case; + end if; + when "00100000" => + if Mode /= 2 then + -- JR NZ,e + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + if F(Flag_Z) = '1' then + MCycles <= "010"; + end if; + when 3 => + NoRead <= '1'; + JumpE <= '1'; + TStates <= "101"; + when others => null; + end case; + end if; + when "11101001" => + -- JP (HL) + JumpXY <= '1'; + when "00010000" => + if Mode = 3 then + I_DJNZ <= '1'; + elsif Mode < 2 then + -- DJNZ,e + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + TStates <= "101"; + I_DJNZ <= '1'; + Set_BusB_To <= "1010"; + Set_BusA_To(2 downto 0) <= "000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + ALU_Op <= "0010"; + when 2 => + I_DJNZ <= '1'; + Inc_PC <= '1'; + when 3 => + NoRead <= '1'; + JumpE <= '1'; + TStates <= "101"; + when others => null; + end case; + end if; + +-- CALL AND RETURN GROUP + when "11001101" => + -- CALL nn + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + IncDec_16 <= "1111"; + Inc_PC <= '1'; + TStates <= "100"; + Set_Addr_To <= aSP; + LDW <= '1'; + Set_BusB_To <= "1101"; + when 4 => + Write <= '1'; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1100"; + when 5 => + Write <= '1'; + Call <= '1'; + when others => null; + end case; + when "11000100"|"11001100"|"11010100"|"11011100"|"11100100"|"11101100"|"11110100"|"11111100" => + if IR(5) = '0' or Mode /= 3 then + -- CALL cc,nn + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Inc_PC <= '1'; + LDW <= '1'; + if is_cc_true(F, to_bitvector(IR(5 downto 3))) then + IncDec_16 <= "1111"; + Set_Addr_TO <= aSP; + TStates <= "100"; + Set_BusB_To <= "1101"; + else + MCycles <= "011"; + end if; + when 4 => + Write <= '1'; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1100"; + when 5 => + Write <= '1'; + Call <= '1'; + when others => null; + end case; + end if; + when "11001001" => + -- RET + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + TStates <= "101"; + Set_Addr_TO <= aSP; + when 2 => + IncDec_16 <= "0111"; + Set_Addr_To <= aSP; + LDZ <= '1'; + when 3 => + Jump <= '1'; + IncDec_16 <= "0111"; + when others => null; + end case; + when "11000000"|"11001000"|"11010000"|"11011000"|"11100000"|"11101000"|"11110000"|"11111000" => + if IR(5) = '1' and Mode = 3 then + case IRB(4 downto 3) is + when "00" => + -- LD ($FF00+nn),A + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Set_Addr_To <= aIOA; + Set_BusB_To <= "0111"; + when 3 => + Write <= '1'; + when others => null; + end case; + when "01" => + -- ADD SP,n + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + ALU_Op <= "0000"; + Inc_PC <= '1'; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusA_To <= "1000"; + Set_BusB_To <= "0110"; + when 3 => + NoRead <= '1'; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + ALU_Op <= "0001"; + Set_BusA_To <= "1001"; + Set_BusB_To <= "1110"; -- Incorrect unsigned !!!!!!!!!!!!!!!!!!!!! + when others => + end case; + when "10" => + -- LD A,($FF00+nn) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Set_Addr_To <= aIOA; + when 3 => + Read_To_Acc <= '1'; + when others => null; + end case; + when "11" => + -- LD HL,SP+n -- Not correct !!!!!!!!!!!!!!!!!!! + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + LDW <= '1'; + when 4 => + Set_BusA_To(2 downto 0) <= "101"; -- L + Read_To_Reg <= '1'; + Inc_WZ <= '1'; + Set_Addr_To <= aZI; + when 5 => + Set_BusA_To(2 downto 0) <= "100"; -- H + Read_To_Reg <= '1'; + when others => null; + end case; + end case; + else + -- RET cc + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + if is_cc_true(F, to_bitvector(IR(5 downto 3))) then + Set_Addr_TO <= aSP; + else + MCycles <= "001"; + end if; + TStates <= "101"; + when 2 => + IncDec_16 <= "0111"; + Set_Addr_To <= aSP; + LDZ <= '1'; + when 3 => + Jump <= '1'; + IncDec_16 <= "0111"; + when others => null; + end case; + end if; + when "11000111"|"11001111"|"11010111"|"11011111"|"11100111"|"11101111"|"11110111"|"11111111" => + -- RST p + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + TStates <= "101"; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1101"; + when 2 => + Write <= '1'; + IncDec_16 <= "1111"; + Set_Addr_To <= aSP; + Set_BusB_To <= "1100"; + when 3 => + Write <= '1'; + RstP <= '1'; + when others => null; + end case; + +-- INPUT AND OUTPUT GROUP + when "11011011" => + if Mode /= 3 then + -- IN A,(n) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Set_Addr_To <= aIOA; + when 3 => + Read_To_Acc <= '1'; + IORQ <= '1'; + when others => null; + end case; + end if; + when "11010011" => + if Mode /= 3 then + -- OUT (n),A + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + Set_Addr_To <= aIOA; + Set_BusB_To <= "0111"; + when 3 => + Write <= '1'; + IORQ <= '1'; + when others => null; + end case; + end if; + +------------------------------------------------------------------------------ +------------------------------------------------------------------------------ +-- MULTIBYTE INSTRUCTIONS +------------------------------------------------------------------------------ +------------------------------------------------------------------------------ + + when "11001011" => + if Mode /= 2 then + Prefix <= "01"; + end if; + + when "11101101" => + if Mode < 2 then + Prefix <= "10"; + end if; + + when "11011101"|"11111101" => + if Mode < 2 then + Prefix <= "11"; + end if; + + end case; + + when "01" => + +------------------------------------------------------------------------------ +-- +-- CB prefixed instructions +-- +------------------------------------------------------------------------------ + + Set_BusA_To(2 downto 0) <= IR(2 downto 0); + Set_BusB_To(2 downto 0) <= IR(2 downto 0); + + case IRB is + when "00000000"|"00000001"|"00000010"|"00000011"|"00000100"|"00000101"|"00000111" + |"00010000"|"00010001"|"00010010"|"00010011"|"00010100"|"00010101"|"00010111" + |"00001000"|"00001001"|"00001010"|"00001011"|"00001100"|"00001101"|"00001111" + |"00011000"|"00011001"|"00011010"|"00011011"|"00011100"|"00011101"|"00011111" + |"00100000"|"00100001"|"00100010"|"00100011"|"00100100"|"00100101"|"00100111" + |"00101000"|"00101001"|"00101010"|"00101011"|"00101100"|"00101101"|"00101111" + |"00110000"|"00110001"|"00110010"|"00110011"|"00110100"|"00110101"|"00110111" + |"00111000"|"00111001"|"00111010"|"00111011"|"00111100"|"00111101"|"00111111" => + -- RLC r + -- RL r + -- RRC r + -- RR r + -- SLA r + -- SRA r + -- SRL r + -- SLL r (Undocumented) / SWAP r + if MCycle = "001" then + ALU_Op <= "1000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + end if; + when "00000110"|"00010110"|"00001110"|"00011110"|"00101110"|"00111110"|"00100110"|"00110110" => + -- RLC (HL) + -- RL (HL) + -- RRC (HL) + -- RR (HL) + -- SRA (HL) + -- SRL (HL) + -- SLA (HL) + -- SLL (HL) (Undocumented) / SWAP (HL) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 | 7 => + Set_Addr_To <= aXY; + when 2 => + ALU_Op <= "1000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_Addr_To <= aXY; + TStates <= "100"; + when 3 => + Write <= '1'; + when others => + end case; + when "01000000"|"01000001"|"01000010"|"01000011"|"01000100"|"01000101"|"01000111" + |"01001000"|"01001001"|"01001010"|"01001011"|"01001100"|"01001101"|"01001111" + |"01010000"|"01010001"|"01010010"|"01010011"|"01010100"|"01010101"|"01010111" + |"01011000"|"01011001"|"01011010"|"01011011"|"01011100"|"01011101"|"01011111" + |"01100000"|"01100001"|"01100010"|"01100011"|"01100100"|"01100101"|"01100111" + |"01101000"|"01101001"|"01101010"|"01101011"|"01101100"|"01101101"|"01101111" + |"01110000"|"01110001"|"01110010"|"01110011"|"01110100"|"01110101"|"01110111" + |"01111000"|"01111001"|"01111010"|"01111011"|"01111100"|"01111101"|"01111111" => + -- BIT b,r + if MCycle = "001" then + Set_BusB_To(2 downto 0) <= IR(2 downto 0); + ALU_Op <= "1001"; + end if; + when "01000110"|"01001110"|"01010110"|"01011110"|"01100110"|"01101110"|"01110110"|"01111110" => + -- BIT b,(HL) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 | 7 => + Set_Addr_To <= aXY; + when 2 => + ALU_Op <= "1001"; + TStates <= "100"; + when others => + end case; + when "11000000"|"11000001"|"11000010"|"11000011"|"11000100"|"11000101"|"11000111" + |"11001000"|"11001001"|"11001010"|"11001011"|"11001100"|"11001101"|"11001111" + |"11010000"|"11010001"|"11010010"|"11010011"|"11010100"|"11010101"|"11010111" + |"11011000"|"11011001"|"11011010"|"11011011"|"11011100"|"11011101"|"11011111" + |"11100000"|"11100001"|"11100010"|"11100011"|"11100100"|"11100101"|"11100111" + |"11101000"|"11101001"|"11101010"|"11101011"|"11101100"|"11101101"|"11101111" + |"11110000"|"11110001"|"11110010"|"11110011"|"11110100"|"11110101"|"11110111" + |"11111000"|"11111001"|"11111010"|"11111011"|"11111100"|"11111101"|"11111111" => + -- SET b,r + if MCycle = "001" then + ALU_Op <= "1010"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + end if; + when "11000110"|"11001110"|"11010110"|"11011110"|"11100110"|"11101110"|"11110110"|"11111110" => + -- SET b,(HL) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 | 7 => + Set_Addr_To <= aXY; + when 2 => + ALU_Op <= "1010"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_Addr_To <= aXY; + TStates <= "100"; + when 3 => + Write <= '1'; + when others => + end case; + when "10000000"|"10000001"|"10000010"|"10000011"|"10000100"|"10000101"|"10000111" + |"10001000"|"10001001"|"10001010"|"10001011"|"10001100"|"10001101"|"10001111" + |"10010000"|"10010001"|"10010010"|"10010011"|"10010100"|"10010101"|"10010111" + |"10011000"|"10011001"|"10011010"|"10011011"|"10011100"|"10011101"|"10011111" + |"10100000"|"10100001"|"10100010"|"10100011"|"10100100"|"10100101"|"10100111" + |"10101000"|"10101001"|"10101010"|"10101011"|"10101100"|"10101101"|"10101111" + |"10110000"|"10110001"|"10110010"|"10110011"|"10110100"|"10110101"|"10110111" + |"10111000"|"10111001"|"10111010"|"10111011"|"10111100"|"10111101"|"10111111" => + -- RES b,r + if MCycle = "001" then + ALU_Op <= "1011"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + end if; + when "10000110"|"10001110"|"10010110"|"10011110"|"10100110"|"10101110"|"10110110"|"10111110" => + -- RES b,(HL) + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 | 7 => + Set_Addr_To <= aXY; + when 2 => + ALU_Op <= "1011"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_Addr_To <= aXY; + TStates <= "100"; + when 3 => + Write <= '1'; + when others => + end case; + end case; + + when others => + +------------------------------------------------------------------------------ +-- +-- ED prefixed instructions +-- +------------------------------------------------------------------------------ + + case IRB is + when "00000000"|"00000001"|"00000010"|"00000011"|"00000100"|"00000101"|"00000110"|"00000111" + |"00001000"|"00001001"|"00001010"|"00001011"|"00001100"|"00001101"|"00001110"|"00001111" + |"00010000"|"00010001"|"00010010"|"00010011"|"00010100"|"00010101"|"00010110"|"00010111" + |"00011000"|"00011001"|"00011010"|"00011011"|"00011100"|"00011101"|"00011110"|"00011111" + |"00100000"|"00100001"|"00100010"|"00100011"|"00100100"|"00100101"|"00100110"|"00100111" + |"00101000"|"00101001"|"00101010"|"00101011"|"00101100"|"00101101"|"00101110"|"00101111" + |"00110000"|"00110001"|"00110010"|"00110011"|"00110100"|"00110101"|"00110110"|"00110111" + |"00111000"|"00111001"|"00111010"|"00111011"|"00111100"|"00111101"|"00111110"|"00111111" + + + |"10000000"|"10000001"|"10000010"|"10000011"|"10000100"|"10000101"|"10000110"|"10000111" + |"10001000"|"10001001"|"10001010"|"10001011"|"10001100"|"10001101"|"10001110"|"10001111" + |"10010000"|"10010001"|"10010010"|"10010011"|"10010100"|"10010101"|"10010110"|"10010111" + |"10011000"|"10011001"|"10011010"|"10011011"|"10011100"|"10011101"|"10011110"|"10011111" + | "10100100"|"10100101"|"10100110"|"10100111" + | "10101100"|"10101101"|"10101110"|"10101111" + | "10110100"|"10110101"|"10110110"|"10110111" + | "10111100"|"10111101"|"10111110"|"10111111" + |"11000000"|"11000001"|"11000010"|"11000011"|"11000100"|"11000101"|"11000110"|"11000111" + |"11001000"|"11001001"|"11001010"|"11001011"|"11001100"|"11001101"|"11001110"|"11001111" + |"11010000"|"11010001"|"11010010"|"11010011"|"11010100"|"11010101"|"11010110"|"11010111" + |"11011000"|"11011001"|"11011010"|"11011011"|"11011100"|"11011101"|"11011110"|"11011111" + |"11100000"|"11100001"|"11100010"|"11100011"|"11100100"|"11100101"|"11100110"|"11100111" + |"11101000"|"11101001"|"11101010"|"11101011"|"11101100"|"11101101"|"11101110"|"11101111" + |"11110000"|"11110001"|"11110010"|"11110011"|"11110100"|"11110101"|"11110110"|"11110111" + |"11111000"|"11111001"|"11111010"|"11111011"|"11111100"|"11111101"|"11111110"|"11111111" => + null; -- NOP, undocumented + when "01111110"|"01111111" => + -- NOP, undocumented + null; +-- 8 BIT LOAD GROUP + when "01010111" => + -- LD A,I + Special_LD <= "100"; + TStates <= "101"; + when "01011111" => + -- LD A,R + Special_LD <= "101"; + TStates <= "101"; + when "01000111" => + -- LD I,A + Special_LD <= "110"; + TStates <= "101"; + when "01001111" => + -- LD R,A + Special_LD <= "111"; + TStates <= "101"; +-- 16 BIT LOAD GROUP + when "01001011"|"01011011"|"01101011"|"01111011" => + -- LD dd,(nn) + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + LDW <= '1'; + when 4 => + Read_To_Reg <= '1'; + if IR(5 downto 4) = "11" then + Set_BusA_To <= "1000"; + else + Set_BusA_To(2 downto 1) <= IR(5 downto 4); + Set_BusA_To(0) <= '1'; + end if; + Inc_WZ <= '1'; + Set_Addr_To <= aZI; + when 5 => + Read_To_Reg <= '1'; + if IR(5 downto 4) = "11" then + Set_BusA_To <= "1001"; + else + Set_BusA_To(2 downto 1) <= IR(5 downto 4); + Set_BusA_To(0) <= '0'; + end if; + when others => null; + end case; + when "01000011"|"01010011"|"01100011"|"01110011" => + -- LD (nn),dd + MCycles <= "101"; + case to_integer(unsigned(MCycle)) is + when 2 => + Inc_PC <= '1'; + LDZ <= '1'; + when 3 => + Set_Addr_To <= aZI; + Inc_PC <= '1'; + LDW <= '1'; + if IR(5 downto 4) = "11" then + Set_BusB_To <= "1000"; + else + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + Set_BusB_To(0) <= '1'; + Set_BusB_To(3) <= '0'; + end if; + when 4 => + Inc_WZ <= '1'; + Set_Addr_To <= aZI; + Write <= '1'; + if IR(5 downto 4) = "11" then + Set_BusB_To <= "1001"; + else + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + Set_BusB_To(0) <= '0'; + Set_BusB_To(3) <= '0'; + end if; + when 5 => + Write <= '1'; + when others => null; + end case; + when "10100000" | "10101000" | "10110000" | "10111000" => + -- LDI, LDD, LDIR, LDDR + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + IncDec_16 <= "1100"; -- BC + when 2 => + Set_BusB_To <= "0110"; + Set_BusA_To(2 downto 0) <= "111"; + ALU_Op <= "0000"; + Set_Addr_To <= aDE; + if IR(3) = '0' then + IncDec_16 <= "0110"; -- IX + else + IncDec_16 <= "1110"; + end if; + when 3 => + I_BT <= '1'; + TStates <= "101"; + Write <= '1'; + if IR(3) = '0' then + IncDec_16 <= "0101"; -- DE + else + IncDec_16 <= "1101"; + end if; + when 4 => + NoRead <= '1'; + TStates <= "101"; + when others => null; + end case; + when "10100001" | "10101001" | "10110001" | "10111001" => + -- CPI, CPD, CPIR, CPDR + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aXY; + IncDec_16 <= "1100"; -- BC + when 2 => + Set_BusB_To <= "0110"; + Set_BusA_To(2 downto 0) <= "111"; + ALU_Op <= "0111"; + Save_ALU <= '1'; + PreserveC <= '1'; + if IR(3) = '0' then + IncDec_16 <= "0110"; + else + IncDec_16 <= "1110"; + end if; + when 3 => + NoRead <= '1'; + I_BC <= '1'; + TStates <= "101"; + when 4 => + NoRead <= '1'; + TStates <= "101"; + when others => null; + end case; + when "01000100"|"01001100"|"01010100"|"01011100"|"01100100"|"01101100"|"01110100"|"01111100" => + -- NEG + Alu_OP <= "0010"; + Set_BusB_To <= "0111"; + Set_BusA_To <= "1010"; + Read_To_Acc <= '1'; + Save_ALU <= '1'; + when "01000110"|"01001110"|"01100110"|"01101110" => + -- IM 0 + IMode <= "00"; + when "01010110"|"01110110" => + -- IM 1 + IMode <= "01"; + when "01011110"|"01110111" => + -- IM 2 + IMode <= "10"; +-- 16 bit arithmetic + when "01001010"|"01011010"|"01101010"|"01111010" => + -- ADC HL,ss + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + NoRead <= '1'; + ALU_Op <= "0001"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusA_To(2 downto 0) <= "101"; + case to_integer(unsigned(IR(5 downto 4))) is + when 0|1|2 => + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + Set_BusB_To(0) <= '1'; + when others => + Set_BusB_To <= "1000"; + end case; + TStates <= "100"; + when 3 => + NoRead <= '1'; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + ALU_Op <= "0001"; + Set_BusA_To(2 downto 0) <= "100"; + case to_integer(unsigned(IR(5 downto 4))) is + when 0|1|2 => + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + Set_BusB_To(0) <= '0'; + when others => + Set_BusB_To <= "1001"; + end case; + when others => + end case; + when "01000010"|"01010010"|"01100010"|"01110010" => + -- SBC HL,ss + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 2 => + NoRead <= '1'; + ALU_Op <= "0011"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusA_To(2 downto 0) <= "101"; + case to_integer(unsigned(IR(5 downto 4))) is + when 0|1|2 => + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + Set_BusB_To(0) <= '1'; + when others => + Set_BusB_To <= "1000"; + end case; + TStates <= "100"; + when 3 => + NoRead <= '1'; + ALU_Op <= "0011"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + Set_BusA_To(2 downto 0) <= "100"; + case to_integer(unsigned(IR(5 downto 4))) is + when 0|1|2 => + Set_BusB_To(2 downto 1) <= IR(5 downto 4); + when others => + Set_BusB_To <= "1001"; + end case; + when others => + end case; + when "01101111" => + -- RLD + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 2 => + NoRead <= '1'; + Set_Addr_To <= aXY; + when 3 => + Read_To_Reg <= '1'; + Set_BusB_To(2 downto 0) <= "110"; + Set_BusA_To(2 downto 0) <= "111"; + ALU_Op <= "1101"; + TStates <= "100"; + Set_Addr_To <= aXY; + Save_ALU <= '1'; + when 4 => + I_RLD <= '1'; + Write <= '1'; + when others => + end case; + when "01100111" => + -- RRD + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 2 => + Set_Addr_To <= aXY; + when 3 => + Read_To_Reg <= '1'; + Set_BusB_To(2 downto 0) <= "110"; + Set_BusA_To(2 downto 0) <= "111"; + ALU_Op <= "1110"; + TStates <= "100"; + Set_Addr_To <= aXY; + Save_ALU <= '1'; + when 4 => + I_RRD <= '1'; + Write <= '1'; + when others => + end case; + when "01000101"|"01001101"|"01010101"|"01011101"|"01100101"|"01101101"|"01110101"|"01111101" => + -- RETI, RETN + MCycles <= "011"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_TO <= aSP; + when 2 => + IncDec_16 <= "0111"; + Set_Addr_To <= aSP; + LDZ <= '1'; + when 3 => + Jump <= '1'; + IncDec_16 <= "0111"; + I_RETN <= '1'; + when others => null; + end case; + when "01000000"|"01001000"|"01010000"|"01011000"|"01100000"|"01101000"|"01110000"|"01111000" => + -- IN r,(C) + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + when 2 => + IORQ <= '1'; + if IR(5 downto 3) /= "110" then + Read_To_Reg <= '1'; + Set_BusA_To(2 downto 0) <= IR(5 downto 3); + end if; + I_INRC <= '1'; + when others => + end case; + when "01000001"|"01001001"|"01010001"|"01011001"|"01100001"|"01101001"|"01110001"|"01111001" => + -- OUT (C),r + -- OUT (C),0 + MCycles <= "010"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + Set_BusB_To(2 downto 0) <= IR(5 downto 3); + if IR(5 downto 3) = "110" then + Set_BusB_To(3) <= '1'; + end if; + when 2 => + Write <= '1'; + IORQ <= '1'; + when others => + end case; + when "10100010" | "10101010" | "10110010" | "10111010" => + -- INI, IND, INIR, INDR + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 1 => + Set_Addr_To <= aBC; + Set_BusB_To <= "1010"; + Set_BusA_To <= "0000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + ALU_Op <= "0010"; + when 2 => + IORQ <= '1'; + Set_BusB_To <= "0110"; + Set_Addr_To <= aXY; + when 3 => + if IR(3) = '0' then + --IncDec_16 <= "0010"; + IncDec_16 <= "0110"; + else + --IncDec_16 <= "0010"; + IncDec_16 <= "0110"; + end if; + TStates <= "100"; + Write <= '1'; + I_BTR <= '1'; + when 4 => + NoRead <= '1'; + TStates <= "101"; + when others => null; + end case; + when "10100011" | "10101011" | "10110011" | "10111011" => + -- OUTI, OUTD, OTIR, OTDR + MCycles <= "100"; + case to_integer(unsigned(MCycle)) is + when 1 => + TStates <= "101"; + Set_Addr_To <= aXY; + Set_BusB_To <= "1010"; + Set_BusA_To <= "0000"; + Read_To_Reg <= '1'; + Save_ALU <= '1'; + ALU_Op <= "0010"; + when 2 => + Set_BusB_To <= "0110"; + Set_Addr_To <= aBC; + when 3 => + if IR(3) = '0' then + --IncDec_16 <= "0010"; + IncDec_16 <= "0110"; + else + --IncDec_16 <= "0010"; + IncDec_16 <= "0110"; + end if; + IORQ <= '1'; + Write <= '1'; + I_BTR <= '1'; + when 4 => + NoRead <= '1'; + TStates <= "101"; + when others => null; + end case; + end case; + + end case; + + if Mode = 1 then + if MCycle = "001" then +-- TStates <= "100"; + else + TStates <= "011"; + end if; + end if; + + if Mode = 3 then + if MCycle = "001" then +-- TStates <= "100"; + else + TStates <= "100"; + end if; + end if; + + if Mode < 2 then + if MCycle = "110" then + Inc_PC <= '1'; + if Mode = 1 then + Set_Addr_To <= aXY; + TStates <= "100"; + Set_BusB_To(2 downto 0) <= SSS; + Set_BusB_To(3) <= '0'; + end if; + if IRB = "00110110" or IRB = "11001011" then + Set_Addr_To <= aNone; + end if; + end if; + if MCycle = "111" then + if Mode = 0 then + TStates <= "101"; + end if; + if ISet /= "01" then + Set_Addr_To <= aXY; + end if; + Set_BusB_To(2 downto 0) <= SSS; + Set_BusB_To(3) <= '0'; + if IRB = "00110110" or ISet = "01" then + -- LD (HL),n + Inc_PC <= '1'; + else + NoRead <= '1'; + end if; + end if; + end if; + + end process; + +end; diff --git a/Sega - SG1000/rtl/t80/T80_Pack.vhd b/Sega - SG1000/rtl/t80/T80_Pack.vhd new file mode 100644 index 00000000..ac7d34da --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80_Pack.vhd @@ -0,0 +1,208 @@ +-- +-- Z80 compatible microprocessor core +-- +-- Version : 0242 +-- +-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t80/ +-- +-- Limitations : +-- +-- File history : +-- + +library IEEE; +use IEEE.std_logic_1164.all; + +package T80_Pack is + + component T80 + generic( + Mode : integer := 0; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB + IOWait : integer := 0; -- 1 => Single cycle I/O, 1 => Std I/O cycle + Flag_C : integer := 0; + Flag_N : integer := 1; + Flag_P : integer := 2; + Flag_X : integer := 3; + Flag_H : integer := 4; + Flag_Y : integer := 5; + Flag_Z : integer := 6; + Flag_S : integer := 7 + ); + port( + RESET_n : in std_logic; + CLK_n : in std_logic; + CEN : in std_logic; + WAIT_n : in std_logic; + INT_n : in std_logic; + NMI_n : in std_logic; + BUSRQ_n : in std_logic; + M1_n : out std_logic; + IORQ : out std_logic; + NoRead : out std_logic; + Write : out std_logic; + RFSH_n : out std_logic; + HALT_n : out std_logic; + BUSAK_n : out std_logic; + A : out std_logic_vector(15 downto 0); + DInst : in std_logic_vector(7 downto 0); + DI : in std_logic_vector(7 downto 0); + DO : out std_logic_vector(7 downto 0); + MC : out std_logic_vector(2 downto 0); + TS : out std_logic_vector(2 downto 0); + IntCycle_n : out std_logic; + IntE : out std_logic; + Stop : out std_logic + ); + end component; + + component T80_Reg + port( + Clk : in std_logic; + CEN : in std_logic; + WEH : in std_logic; + WEL : in std_logic; + AddrA : in std_logic_vector(2 downto 0); + AddrB : in std_logic_vector(2 downto 0); + AddrC : in std_logic_vector(2 downto 0); + DIH : in std_logic_vector(7 downto 0); + DIL : in std_logic_vector(7 downto 0); + DOAH : out std_logic_vector(7 downto 0); + DOAL : out std_logic_vector(7 downto 0); + DOBH : out std_logic_vector(7 downto 0); + DOBL : out std_logic_vector(7 downto 0); + DOCH : out std_logic_vector(7 downto 0); + DOCL : out std_logic_vector(7 downto 0) + ); + end component; + + component T80_MCode + generic( + Mode : integer := 0; + Flag_C : integer := 0; + Flag_N : integer := 1; + Flag_P : integer := 2; + Flag_X : integer := 3; + Flag_H : integer := 4; + Flag_Y : integer := 5; + Flag_Z : integer := 6; + Flag_S : integer := 7 + ); + port( + IR : in std_logic_vector(7 downto 0); + ISet : in std_logic_vector(1 downto 0); + MCycle : in std_logic_vector(2 downto 0); + F : in std_logic_vector(7 downto 0); + NMICycle : in std_logic; + IntCycle : in std_logic; + MCycles : out std_logic_vector(2 downto 0); + TStates : out std_logic_vector(2 downto 0); + Prefix : out std_logic_vector(1 downto 0); -- None,BC,ED,DD/FD + Inc_PC : out std_logic; + Inc_WZ : out std_logic; + IncDec_16 : out std_logic_vector(3 downto 0); -- BC,DE,HL,SP 0 is inc + Read_To_Reg : out std_logic; + Read_To_Acc : out std_logic; + Set_BusA_To : out std_logic_vector(3 downto 0); -- B,C,D,E,H,L,DI/DB,A,SP(L),SP(M),0,F + Set_BusB_To : out std_logic_vector(3 downto 0); -- B,C,D,E,H,L,DI,A,SP(L),SP(M),1,F,PC(L),PC(M),0 + ALU_Op : out std_logic_vector(3 downto 0); + -- ADD, ADC, SUB, SBC, AND, XOR, OR, CP, ROT, BIT, SET, RES, DAA, RLD, RRD, None + Save_ALU : out std_logic; + PreserveC : out std_logic; + Arith16 : out std_logic; + Set_Addr_To : out std_logic_vector(2 downto 0); -- aNone,aXY,aIOA,aSP,aBC,aDE,aZI + IORQ : out std_logic; + Jump : out std_logic; + JumpE : out std_logic; + JumpXY : out std_logic; + Call : out std_logic; + RstP : out std_logic; + LDZ : out std_logic; + LDW : out std_logic; + LDSPHL : out std_logic; + Special_LD : out std_logic_vector(2 downto 0); -- A,I;A,R;I,A;R,A;None + ExchangeDH : out std_logic; + ExchangeRp : out std_logic; + ExchangeAF : out std_logic; + ExchangeRS : out std_logic; + I_DJNZ : out std_logic; + I_CPL : out std_logic; + I_CCF : out std_logic; + I_SCF : out std_logic; + I_RETN : out std_logic; + I_BT : out std_logic; + I_BC : out std_logic; + I_BTR : out std_logic; + I_RLD : out std_logic; + I_RRD : out std_logic; + I_INRC : out std_logic; + SetDI : out std_logic; + SetEI : out std_logic; + IMode : out std_logic_vector(1 downto 0); + Halt : out std_logic; + NoRead : out std_logic; + Write : out std_logic + ); + end component; + + component T80_ALU + generic( + Mode : integer := 0; + Flag_C : integer := 0; + Flag_N : integer := 1; + Flag_P : integer := 2; + Flag_X : integer := 3; + Flag_H : integer := 4; + Flag_Y : integer := 5; + Flag_Z : integer := 6; + Flag_S : integer := 7 + ); + port( + Arith16 : in std_logic; + Z16 : in std_logic; + ALU_Op : in std_logic_vector(3 downto 0); + IR : in std_logic_vector(5 downto 0); + ISet : in std_logic_vector(1 downto 0); + BusA : in std_logic_vector(7 downto 0); + BusB : in std_logic_vector(7 downto 0); + F_In : in std_logic_vector(7 downto 0); + Q : out std_logic_vector(7 downto 0); + F_Out : out std_logic_vector(7 downto 0) + ); + end component; + +end; diff --git a/Sega - SG1000/rtl/t80/T80_Reg.vhd b/Sega - SG1000/rtl/t80/T80_Reg.vhd new file mode 100644 index 00000000..828485fb --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80_Reg.vhd @@ -0,0 +1,105 @@ +-- +-- T80 Registers, technology independent +-- +-- Version : 0244 +-- +-- Copyright (c) 2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t51/ +-- +-- Limitations : +-- +-- File history : +-- +-- 0242 : Initial release +-- +-- 0244 : Changed to single register file +-- + +library IEEE; +use IEEE.std_logic_1164.all; +use IEEE.numeric_std.all; + +entity T80_Reg is + port( + Clk : in std_logic; + CEN : in std_logic; + WEH : in std_logic; + WEL : in std_logic; + AddrA : in std_logic_vector(2 downto 0); + AddrB : in std_logic_vector(2 downto 0); + AddrC : in std_logic_vector(2 downto 0); + DIH : in std_logic_vector(7 downto 0); + DIL : in std_logic_vector(7 downto 0); + DOAH : out std_logic_vector(7 downto 0); + DOAL : out std_logic_vector(7 downto 0); + DOBH : out std_logic_vector(7 downto 0); + DOBL : out std_logic_vector(7 downto 0); + DOCH : out std_logic_vector(7 downto 0); + DOCL : out std_logic_vector(7 downto 0) + ); +end T80_Reg; + +architecture rtl of T80_Reg is + + type Register_Image is array (natural range <>) of std_logic_vector(7 downto 0); + signal RegsH : Register_Image(0 to 7); + signal RegsL : Register_Image(0 to 7); + +begin + + process (Clk) + begin + if Clk'event and Clk = '1' then + if CEN = '1' then + if WEH = '1' then + RegsH(to_integer(unsigned(AddrA))) <= DIH; + end if; + if WEL = '1' then + RegsL(to_integer(unsigned(AddrA))) <= DIL; + end if; + end if; + end if; + end process; + + DOAH <= RegsH(to_integer(unsigned(AddrA))); + DOAL <= RegsL(to_integer(unsigned(AddrA))); + DOBH <= RegsH(to_integer(unsigned(AddrB))); + DOBL <= RegsL(to_integer(unsigned(AddrB))); + DOCH <= RegsH(to_integer(unsigned(AddrC))); + DOCL <= RegsL(to_integer(unsigned(AddrC))); + +end; diff --git a/Sega - SG1000/rtl/t80/T80a.vhd b/Sega - SG1000/rtl/t80/T80a.vhd new file mode 100644 index 00000000..5e189020 --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80a.vhd @@ -0,0 +1,253 @@ +-- +-- Z80 compatible microprocessor core, asynchronous top level +-- +-- Version : 0247 +-- +-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t80/ +-- +-- Limitations : +-- +-- File history : +-- +-- 0208 : First complete release +-- +-- 0211 : Fixed interrupt cycle +-- +-- 0235 : Updated for T80 interface change +-- +-- 0238 : Updated for T80 interface change +-- +-- 0240 : Updated for T80 interface change +-- +-- 0242 : Updated for T80 interface change +-- +-- 0247 : Fixed bus req/ack cycle +-- + +library IEEE; +use IEEE.std_logic_1164.all; +use IEEE.numeric_std.all; +use work.T80_Pack.all; + +entity T80a is + generic( + Mode : integer := 0 -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB + ); + port( + RESET_n : in std_logic; + CLK_n : in std_logic; + WAIT_n : in std_logic; + INT_n : in std_logic; + NMI_n : in std_logic; + BUSRQ_n : in std_logic; + M1_n : out std_logic; + MREQ_n : out std_logic; + IORQ_n : out std_logic; + RD_n : out std_logic; + WR_n : out std_logic; + RFSH_n : out std_logic; + HALT_n : out std_logic; + BUSAK_n : out std_logic; + A : out std_logic_vector(15 downto 0); + D : inout std_logic_vector(7 downto 0) + ); +end T80a; + +architecture rtl of T80a is + + signal CEN : std_logic; + signal Reset_s : std_logic; + signal IntCycle_n : std_logic; + signal IORQ : std_logic; + signal NoRead : std_logic; + signal Write : std_logic; + signal MREQ : std_logic; + signal MReq_Inhibit : std_logic; + signal Req_Inhibit : std_logic; + signal RD : std_logic; + signal MREQ_n_i : std_logic; + signal IORQ_n_i : std_logic; + signal RD_n_i : std_logic; + signal WR_n_i : std_logic; + signal RFSH_n_i : std_logic; + signal BUSAK_n_i : std_logic; + signal A_i : std_logic_vector(15 downto 0); + signal DO : std_logic_vector(7 downto 0); + signal DI_Reg : std_logic_vector (7 downto 0); -- Input synchroniser + signal Wait_s : std_logic; + signal MCycle : std_logic_vector(2 downto 0); + signal TState : std_logic_vector(2 downto 0); + +begin + + CEN <= '1'; + + BUSAK_n <= BUSAK_n_i; + MREQ_n_i <= not MREQ or (Req_Inhibit and MReq_Inhibit); + RD_n_i <= not RD or Req_Inhibit; + + MREQ_n <= MREQ_n_i when BUSAK_n_i = '1' else 'Z'; + IORQ_n <= IORQ_n_i when BUSAK_n_i = '1' else 'Z'; + RD_n <= RD_n_i when BUSAK_n_i = '1' else 'Z'; + WR_n <= WR_n_i when BUSAK_n_i = '1' else 'Z'; + RFSH_n <= RFSH_n_i when BUSAK_n_i = '1' else 'Z'; + A <= A_i when BUSAK_n_i = '1' else (others => 'Z'); + D <= DO when Write = '1' and BUSAK_n_i = '1' else (others => 'Z'); + + process (RESET_n, CLK_n) + begin + if RESET_n = '0' then + Reset_s <= '0'; + elsif CLK_n'event and CLK_n = '1' then + Reset_s <= '1'; + end if; + end process; + + u0 : T80 + generic map( + Mode => Mode, + IOWait => 1) + port map( + CEN => CEN, + M1_n => M1_n, + IORQ => IORQ, + NoRead => NoRead, + Write => Write, + RFSH_n => RFSH_n_i, + HALT_n => HALT_n, + WAIT_n => Wait_s, + INT_n => INT_n, + NMI_n => NMI_n, + RESET_n => Reset_s, + BUSRQ_n => BUSRQ_n, + BUSAK_n => BUSAK_n_i, + CLK_n => CLK_n, + A => A_i, + DInst => D, + DI => DI_Reg, + DO => DO, + MC => MCycle, + TS => TState, + IntCycle_n => IntCycle_n); + + process (CLK_n) + begin + if CLK_n'event and CLK_n = '0' then + Wait_s <= WAIT_n; + if TState = "011" and BUSAK_n_i = '1' then + DI_Reg <= to_x01(D); + end if; + end if; + end process; + + process (Reset_s,CLK_n) + begin + if Reset_s = '0' then + WR_n_i <= '1'; + elsif CLK_n'event and CLK_n = '1' then + WR_n_i <= '1'; + if TState = "001" then -- To short for IO writes !!!!!!!!!!!!!!!!!!! + WR_n_i <= not Write; + end if; + end if; + end process; + + process (Reset_s,CLK_n) + begin + if Reset_s = '0' then + Req_Inhibit <= '0'; + elsif CLK_n'event and CLK_n = '1' then + if MCycle = "001" and TState = "010" then + Req_Inhibit <= '1'; + else + Req_Inhibit <= '0'; + end if; + end if; + end process; + + process (Reset_s,CLK_n) + begin + if Reset_s = '0' then + MReq_Inhibit <= '0'; + elsif CLK_n'event and CLK_n = '0' then + if MCycle = "001" and TState = "010" then + MReq_Inhibit <= '1'; + else + MReq_Inhibit <= '0'; + end if; + end if; + end process; + + process(Reset_s,CLK_n) + begin + if Reset_s = '0' then + RD <= '0'; + IORQ_n_i <= '1'; + MREQ <= '0'; + elsif CLK_n'event and CLK_n = '0' then + + if MCycle = "001" then + if TState = "001" then + RD <= IntCycle_n; + MREQ <= IntCycle_n; + IORQ_n_i <= IntCycle_n; + end if; + if TState = "011" then + RD <= '0'; + IORQ_n_i <= '1'; + MREQ <= '1'; + end if; + if TState = "100" then + MREQ <= '0'; + end if; + else + if TState = "001" and NoRead = '0' then + RD <= not Write; + IORQ_n_i <= not IORQ; + MREQ <= not IORQ; + end if; + if TState = "011" then + RD <= '0'; + IORQ_n_i <= '1'; + MREQ <= '0'; + end if; + end if; + end if; + end process; + +end; diff --git a/Sega - SG1000/rtl/t80/T80se.vhd b/Sega - SG1000/rtl/t80/T80se.vhd new file mode 100644 index 00000000..ac8886a8 --- /dev/null +++ b/Sega - SG1000/rtl/t80/T80se.vhd @@ -0,0 +1,184 @@ +-- +-- Z80 compatible microprocessor core, synchronous top level with clock enable +-- Different timing than the original z80 +-- Inputs needs to be synchronous and outputs may glitch +-- +-- Version : 0242 +-- +-- Copyright (c) 2001-2002 Daniel Wallner (jesus@opencores.org) +-- +-- All rights reserved +-- +-- Redistribution and use in source and synthezised forms, with or without +-- modification, are permitted provided that the following conditions are met: +-- +-- Redistributions of source code must retain the above copyright notice, +-- this list of conditions and the following disclaimer. +-- +-- Redistributions in synthesized form must reproduce the above copyright +-- notice, this list of conditions and the following disclaimer in the +-- documentation and/or other materials provided with the distribution. +-- +-- Neither the name of the author nor the names of other contributors may +-- be used to endorse or promote products derived from this software without +-- specific prior written permission. +-- +-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE +-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +-- POSSIBILITY OF SUCH DAMAGE. +-- +-- Please report bugs to the author, but before you do so, please +-- make sure that this is not a derivative work and that +-- you have the latest version of this file. +-- +-- The latest version of this file can be found at: +-- http://www.opencores.org/cvsweb.shtml/t80/ +-- +-- Limitations : +-- +-- File history : +-- +-- 0235 : First release +-- +-- 0236 : Added T2Write generic +-- +-- 0237 : Fixed T2Write with wait state +-- +-- 0238 : Updated for T80 interface change +-- +-- 0240 : Updated for T80 interface change +-- +-- 0242 : Updated for T80 interface change +-- + +library IEEE; +use IEEE.std_logic_1164.all; +use IEEE.numeric_std.all; +use work.T80_Pack.all; + +entity T80se is + generic( + Mode : integer := 0; -- 0 => Z80, 1 => Fast Z80, 2 => 8080, 3 => GB + T2Write : integer := 0; -- 0 => WR_n active in T3, /=0 => WR_n active in T2 + IOWait : integer := 1 -- 0 => Single cycle I/O, 1 => Std I/O cycle + ); + port( + RESET_n : in std_logic; + CLK_n : in std_logic; + CLKEN : in std_logic; + WAIT_n : in std_logic; + INT_n : in std_logic; + NMI_n : in std_logic; + BUSRQ_n : in std_logic; + M1_n : out std_logic; + MREQ_n : out std_logic; + IORQ_n : out std_logic; + RD_n : out std_logic; + WR_n : out std_logic; + RFSH_n : out std_logic; + HALT_n : out std_logic; + BUSAK_n : out std_logic; + A : out std_logic_vector(15 downto 0); + DI : in std_logic_vector(7 downto 0); + DO : out std_logic_vector(7 downto 0) + ); +end T80se; + +architecture rtl of T80se is + + signal IntCycle_n : std_logic; + signal NoRead : std_logic; + signal Write : std_logic; + signal IORQ : std_logic; + signal DI_Reg : std_logic_vector(7 downto 0); + signal MCycle : std_logic_vector(2 downto 0); + signal TState : std_logic_vector(2 downto 0); + +begin + + u0 : T80 + generic map( + Mode => Mode, + IOWait => IOWait) + port map( + CEN => CLKEN, + M1_n => M1_n, + IORQ => IORQ, + NoRead => NoRead, + Write => Write, + RFSH_n => RFSH_n, + HALT_n => HALT_n, + WAIT_n => Wait_n, + INT_n => INT_n, + NMI_n => NMI_n, + RESET_n => RESET_n, + BUSRQ_n => BUSRQ_n, + BUSAK_n => BUSAK_n, + CLK_n => CLK_n, + A => A, + DInst => DI, + DI => DI_Reg, + DO => DO, + MC => MCycle, + TS => TState, + IntCycle_n => IntCycle_n); + + process (RESET_n, CLK_n) + begin + if RESET_n = '0' then + RD_n <= '1'; + WR_n <= '1'; + IORQ_n <= '1'; + MREQ_n <= '1'; + DI_Reg <= "00000000"; + elsif CLK_n'event and CLK_n = '1' then + if CLKEN = '1' then + RD_n <= '1'; + WR_n <= '1'; + IORQ_n <= '1'; + MREQ_n <= '1'; + if MCycle = "001" then + if TState = "001" or (TState = "010" and Wait_n = '0') then + RD_n <= not IntCycle_n; + MREQ_n <= not IntCycle_n; + IORQ_n <= IntCycle_n; + end if; + if TState = "011" then + MREQ_n <= '0'; + end if; + else + if (TState = "001" or (TState = "010" and Wait_n = '0')) and NoRead = '0' and Write = '0' then + RD_n <= '0'; + IORQ_n <= not IORQ; + MREQ_n <= IORQ; + end if; + if T2Write = 0 then + if TState = "010" and Write = '1' then + WR_n <= '0'; + IORQ_n <= not IORQ; + MREQ_n <= IORQ; + end if; + else + if (TState = "001" or (TState = "010" and Wait_n = '0')) and Write = '1' then + WR_n <= '0'; + IORQ_n <= not IORQ; + MREQ_n <= IORQ; + end if; + end if; + end if; + if TState = "010" and Wait_n = '1' then + DI_Reg <= DI; + end if; + end if; + end if; + end process; + +end; diff --git a/Sega - SG1000/rtl/vdp/vdp.vhd b/Sega - SG1000/rtl/vdp/vdp.vhd new file mode 100644 index 00000000..5deab954 --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp.vhd @@ -0,0 +1,296 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity vdp is + port ( + cpu_clk: in STD_LOGIC; + vdp_clk: in STD_LOGIC; + RD_n: in STD_LOGIC; + WR_n: in STD_LOGIC; + IRQ_n: out STD_LOGIC; + A: in STD_LOGIC_VECTOR (7 downto 0); + D_in: in STD_LOGIC_VECTOR (7 downto 0); + D_out: out STD_LOGIC_VECTOR (7 downto 0); + x: unsigned(8 downto 0); + y: unsigned(7 downto 0); + vblank: std_logic; + hblank: std_logic; + color: out std_logic_vector (5 downto 0)); +end vdp; + +architecture Behavioral of vdp is + + component vdp_main is + port ( + clk: in std_logic; + vram_A: out std_logic_vector(13 downto 0); + vram_D: in std_logic_vector(7 downto 0); + cram_A: out std_logic_vector(4 downto 0); + cram_D: in std_logic_vector(5 downto 0); + + x: unsigned(8 downto 0); + y: unsigned(7 downto 0); + + color: out std_logic_vector (5 downto 0); + + display_on: in std_logic; + mask_column0: in std_logic; + overscan: in std_logic_vector (3 downto 0); + + bg_address: in std_logic_vector (2 downto 0); + bg_scroll_x: in unsigned(7 downto 0); + bg_scroll_y: in unsigned(7 downto 0); + disable_hscroll: in std_logic; + + spr_address: in std_logic_vector (5 downto 0); + spr_high_bit: in std_logic; + spr_shift: in std_logic; + spr_tall: in std_logic); + end component; + + component vdp_cram is + port ( + cpu_clk: in STD_LOGIC; + cpu_WE: in std_logic; + cpu_A: in std_logic_vector(4 downto 0); + cpu_D: in std_logic_vector(5 downto 0); + vdp_clk: in STD_LOGIC; + vdp_A: in std_logic_vector(4 downto 0); + vdp_D: out std_logic_vector(5 downto 0)); + end component; + + -- helper bits + signal data_write: std_logic; + signal address_ff: std_logic := '0'; + signal to_cram: boolean := false; + + -- vram and cram lines for the cpu interface + signal xram_cpu_A: std_logic_vector(13 downto 0); + signal vram_cpu_WE: std_logic; + signal cram_cpu_WE: std_logic; + signal vram_cpu_D_out: std_logic_vector(7 downto 0); + signal xram_cpu_A_incr: std_logic := '0'; + + -- vram and cram lines for the video interface + signal vram_vdp_A: std_logic_vector(13 downto 0); + signal vram_vdp_D: std_logic_vector(7 downto 0); + signal cram_vdp_A: std_logic_vector(4 downto 0); + signal cram_vdp_D: std_logic_vector(5 downto 0); + + -- control bits + signal display_on: std_logic := '1'; + signal disable_hscroll: std_logic := '0'; + signal mask_column0: std_logic := '0'; + signal overscan: std_logic_vector (3 downto 0) := "0000"; + signal irq_frame_en: std_logic := '0'; + signal irq_line_en: std_logic := '0'; + signal irq_line_count: unsigned(7 downto 0) := (others=>'1'); + signal bg_address: std_logic_vector (2 downto 0) := (others=>'0'); + signal bg_scroll_x: unsigned(7 downto 0) := (others=>'0'); + signal bg_scroll_y: unsigned(7 downto 0) := (others=>'0'); + signal spr_address: std_logic_vector (5 downto 0) := (others=>'0'); + signal spr_shift: std_logic := '0'; + signal spr_tall: std_logic := '0'; + signal spr_high_bit: std_logic := '0'; + + -- various counters + signal last_y0: std_logic := '0'; + signal virq_flag: std_logic := '0'; + signal reset_virq_flag: boolean := false; + signal irq_counter: unsigned(4 downto 0) := (others=>'0'); + signal hbl_counter: unsigned(7 downto 0) := (others=>'0'); + signal vbl_irq: std_logic; + signal hbl_irq: std_logic; + +begin + + vdp_main_inst: vdp_main + port map( + clk => vdp_clk, + vram_A => vram_vdp_A, + vram_D => vram_vdp_D, + cram_A => cram_vdp_A, + cram_D => cram_vdp_D, + + x => x, + y => y, + color => color, + + display_on => display_on, + mask_column0 => mask_column0, + overscan => overscan, + + bg_address => bg_address, + bg_scroll_x => bg_scroll_x, + bg_scroll_y => bg_scroll_y, + disable_hscroll=>disable_hscroll, + + spr_address => spr_address, + spr_high_bit => spr_high_bit, + spr_shift => spr_shift, + spr_tall => spr_tall); + + + vdp_vram_inst : entity work.dpram + generic map + ( + init_file => "vram.hex", + widthad_a => 14 + ) + port map + ( + clock_a => cpu_clk, + address_a => xram_cpu_A(13 downto 0), + wren_a => vram_cpu_WE, + data_a => D_in, + q_a => vram_cpu_D_out, + + clock_b => not vdp_clk, + address_b => vram_vdp_A, + wren_b => '0', + data_b => (others => '0'), + q_b => vram_vdp_D + ); + + vdp_cram_inst: vdp_cram + port map ( + cpu_clk => cpu_clk, + cpu_WE => cram_cpu_WE, + cpu_A => xram_cpu_A(4 downto 0), + cpu_D => D_in(5 downto 0), + vdp_clk => vdp_clk, + vdp_A => cram_vdp_A, + vdp_D => cram_vdp_D); + + + data_write <= not WR_n and not A(0); + cram_cpu_WE <= data_write when to_cram else '0'; + vram_cpu_WE <= data_write when not to_cram else '0'; + + process (cpu_clk) + begin + if rising_edge(cpu_clk) then + if WR_n='0' then + if A(0)='0' then + xram_cpu_A_incr <= '1'; + + else + if address_ff='0' then + xram_cpu_A(7 downto 0) <= D_in; + else + xram_cpu_A(13 downto 8) <= D_in(5 downto 0); + to_cram <= D_in(7 downto 6)="11"; + case D_in is + when "10000000" => + disable_hscroll<= xram_cpu_A(6); + mask_column0 <= xram_cpu_A(5); + irq_line_en <= xram_cpu_A(4); + spr_shift <= xram_cpu_A(3); + when "10000001" => + display_on <= xram_cpu_A(6); + irq_frame_en <= xram_cpu_A(5); + spr_tall <= xram_cpu_A(1); + when "10000010" => + bg_address <= xram_cpu_A(3 downto 1); + when "10000101" => + spr_address <= xram_cpu_A(6 downto 1); + when "10000110" => + spr_high_bit <= xram_cpu_A(2); + when "10000111" => + overscan <= xram_cpu_A(3 downto 0); + when "10001000" => + bg_scroll_x <= unsigned(xram_cpu_A(7 downto 0)); + when "10001001" => + bg_scroll_y <= unsigned(xram_cpu_A(7 downto 0)); + when "10001010" => + irq_line_count <= unsigned(xram_cpu_A(7 downto 0)); + when others => + end case; + end if; + address_ff <= not address_ff; + end if; + + elsif RD_n='0' then + case A(7 downto 6)&A(0) is + when "010" => + D_out <= std_logic_vector(y); + when "011" => + D_out <= std_logic_vector(x(7 downto 0)); + when "100" => + D_out <= vram_cpu_D_out; + xram_cpu_A_incr <= '1'; + when "101" => + D_out(7) <= virq_flag; + D_out(6 downto 0) <= (others=>'0'); + reset_virq_flag <= true; + when others => + end case; + + elsif xram_cpu_A_incr='1' then + xram_cpu_A <= std_logic_vector(unsigned(xram_cpu_A) + 1); + xram_cpu_A_incr <= '0'; + + else + reset_virq_flag <= false; + end if; + end if; + end process; + + + process (vdp_clk) + begin + if rising_edge(vdp_clk) then + if vblank='1' then + vbl_irq <= irq_frame_en; + else + vbl_irq <= '0'; + end if; + end if; + end process; + + process (vdp_clk) + begin + if rising_edge(vdp_clk) then + if x=256 and not (last_y0=std_logic(y(0))) then + last_y0 <= std_logic(y(0)); + if y<192 then + if hbl_counter=0 then + hbl_irq <= irq_line_en; + hbl_counter <= irq_line_count; + else + hbl_counter <= hbl_counter-1; + end if; + else + hbl_counter <= irq_line_count; + end if; + else + hbl_irq <= '0'; + end if; + end if; + end process; + + process (vdp_clk) + begin + if rising_edge(vdp_clk) then + if vbl_irq='1' then + virq_flag <= '1'; + elsif reset_virq_flag then + virq_flag <= '0'; + end if; + end if; + end process; + + process (vdp_clk) + begin + if rising_edge(vdp_clk) then + if vbl_irq='1' or hbl_irq='1' then + irq_counter <= (others=>'1'); + elsif irq_counter>0 then + irq_counter <= irq_counter-1; + end if; + end if; + end process; + IRQ_n <= '0' when irq_counter>0 else '1'; + +end Behavioral; diff --git a/Sega - SG1000/rtl/vdp/vdp_background.vhd b/Sega - SG1000/rtl/vdp/vdp_background.vhd new file mode 100644 index 00000000..6049b89f --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp_background.vhd @@ -0,0 +1,136 @@ +library ieee; +use ieee.std_logic_1164.all; +use IEEE.NUMERIC_STD.ALL; + +entity vdp_background is +port ( + clk: in std_logic; + reset: in std_logic; + table_address: in std_logic_vector(13 downto 11); + scroll_x: in unsigned(7 downto 0); + disable_hscroll: in std_logic; + y: in unsigned(7 downto 0); + + vram_A: out std_logic_vector(13 downto 0); + vram_D: in std_logic_vector(7 downto 0); + + color: out std_logic_vector(4 downto 0); + priority: out std_logic +); +end entity; + +architecture rtl of vdp_background is + + signal tile_index : std_logic_vector (8 downto 0); + signal x : unsigned (7 downto 0); + signal tile_y : std_logic_vector (2 downto 0); + signal palette : std_logic; + signal priority_latch: std_logic; + signal flip_x : std_logic; + + signal data0 : std_logic_vector(7 downto 0); + signal data1 : std_logic_vector(7 downto 0); + signal data2 : std_logic_vector(7 downto 0); + signal data3 : std_logic_vector(7 downto 0); + + signal shift0 : std_logic_vector(7 downto 0); + signal shift1 : std_logic_vector(7 downto 0); + signal shift2 : std_logic_vector(7 downto 0); + signal shift3 : std_logic_vector(7 downto 0); + +begin + + process (clk) begin + if (rising_edge(clk)) then + if (reset='1') then + if disable_hscroll='0' or y>=16 then + x <= 240-scroll_x; + else + x <= "11110000"; -- 240 + end if; + else + x <= x + 1; + end if; + end if; + end process; + + process (clk) + variable char_address : std_logic_vector(12 downto 0); + variable data_address : std_logic_vector(11 downto 0); + begin + if (rising_edge(clk)) then + char_address(12 downto 10) := table_address; + char_address(9 downto 5) := std_logic_vector(y(7 downto 3)); + char_address(4 downto 0) := std_logic_vector(x(7 downto 3) + 1); + data_address := tile_index & tile_y; + + case x(2 downto 0) is + when "000" => vram_A <= char_address & "0"; + when "001" => vram_A <= char_address & "1"; + when "011" => vram_A <= data_address & "00"; + when "100" => vram_A <= data_address & "01"; + when "101" => vram_A <= data_address & "10"; + when "110" => vram_A <= data_address & "11"; + when others => + end case; + end if; + end process; + + process (clk) begin + if (rising_edge(clk)) then + case x(2 downto 0) is + when "001" => + tile_index(7 downto 0) <= vram_D; + when "010" => + tile_index(8) <= vram_D(0); + flip_x <= vram_D(1); + tile_y(0) <= y(0) xor vram_D(2); + tile_y(1) <= y(1) xor vram_D(2); + tile_y(2) <= y(2) xor vram_D(2); + palette <= vram_D(3); + priority_latch <= vram_D(4); + when "100" => + data0 <= vram_D; + when "101" => + data1 <= vram_D; + when "110" => + data2 <= vram_D; +-- when "111" => +-- data3 <= vram_D; + when others => + end case; + end if; + end process; + + process (clk) begin + if (rising_edge(clk)) then + case x(2 downto 0) is + when "111" => + if flip_x='0' then + shift0 <= data0; + shift1 <= data1; + shift2 <= data2; + shift3 <= vram_D; + else + shift0 <= data0(0)&data0(1)&data0(2)&data0(3)&data0(4)&data0(5)&data0(6)&data0(7); + shift1 <= data1(0)&data1(1)&data1(2)&data1(3)&data1(4)&data1(5)&data1(6)&data1(7); + shift2 <= data2(0)&data2(1)&data2(2)&data2(3)&data2(4)&data2(5)&data2(6)&data2(7); + shift3 <= vram_D(0)&vram_D(1)&vram_D(2)&vram_D(3)&vram_D(4)&vram_D(5)&vram_D(6)&vram_D(7); + end if; + color(4) <= palette; + priority <= priority_latch; + when others => + shift0(7 downto 1) <= shift0(6 downto 0); + shift1(7 downto 1) <= shift1(6 downto 0); + shift2(7 downto 1) <= shift2(6 downto 0); + shift3(7 downto 1) <= shift3(6 downto 0); + end case; + end if; + end process; + + color(0) <= shift0(7); + color(1) <= shift1(7); + color(2) <= shift2(7); + color(3) <= shift3(7); +end architecture; + diff --git a/Sega - SG1000/rtl/vdp/vdp_cram.vhd b/Sega - SG1000/rtl/vdp/vdp_cram.vhd new file mode 100644 index 00000000..781a1e35 --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp_cram.vhd @@ -0,0 +1,44 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity vdp_cram is + port ( + cpu_clk: in STD_LOGIC; + cpu_WE: in STD_LOGIC; + cpu_A: in STD_LOGIC_VECTOR (4 downto 0); + cpu_D: in STD_LOGIC_VECTOR (5 downto 0); + vdp_clk: in STD_LOGIC; + vdp_A: in STD_LOGIC_VECTOR (4 downto 0); + vdp_D: out STD_LOGIC_VECTOR (5 downto 0)); +end vdp_cram; + +architecture Behavioral of vdp_cram is + + type t_ram is array (0 to 31) of std_logic_vector(5 downto 0); + signal ram : t_ram := (others => "111111"); + +begin + + process (cpu_clk) + variable i : integer range 0 to 31; + begin + if rising_edge(cpu_clk) then + if cpu_WE='1'then + i := to_integer(unsigned(cpu_A)); + ram(i) <= cpu_D; + end if; + end if; + end process; + + process (vdp_clk) + variable i : integer range 0 to 31; + begin + if rising_edge(vdp_clk) then + i := to_integer(unsigned(vdp_A)); + vdp_D <= ram(i); + end if; + end process; + +end Behavioral; + diff --git a/Sega - SG1000/rtl/vdp/vdp_main.vhd b/Sega - SG1000/rtl/vdp/vdp_main.vhd new file mode 100644 index 00000000..c89bfe2c --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp_main.vhd @@ -0,0 +1,135 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity vdp_main is + port ( + clk: in std_logic; + vram_A: out std_logic_vector(13 downto 0); + vram_D: in std_logic_vector(7 downto 0); + cram_A: out std_logic_vector(4 downto 0); + cram_D: in std_logic_vector(5 downto 0); + + x: unsigned(8 downto 0); + y: unsigned(7 downto 0); + + color: out std_logic_vector (5 downto 0); + + display_on: in std_logic; + mask_column0: in std_logic; + overscan: in std_logic_vector (3 downto 0); + + bg_address: in std_logic_vector (2 downto 0); + bg_scroll_x: in unsigned(7 downto 0); + bg_scroll_y: in unsigned(7 downto 0); + disable_hscroll: in std_logic; + + spr_address: in std_logic_vector (5 downto 0); + spr_high_bit: in std_logic; + spr_shift: in std_logic; + spr_tall: in std_logic); +end vdp_main; + +architecture Behavioral of vdp_main is + + component vdp_background is + port ( + clk: in std_logic; + reset: in std_logic; + table_address: in std_logic_vector(13 downto 11); + scroll_x: in unsigned(7 downto 0); + disable_hscroll: in std_logic; + y: in unsigned(7 downto 0); + vram_A: out std_logic_vector(13 downto 0); + vram_D: in std_logic_vector(7 downto 0); + color: out std_logic_vector(4 downto 0); + priority: out std_logic); + end component; + + component vdp_sprites is + port ( + clk: in std_logic; + table_address: in std_logic_vector(13 downto 8); + char_high_bit: in std_logic; + tall: in std_logic; + x: in unsigned(8 downto 0); + y: in unsigned(7 downto 0); + vram_A: out std_logic_vector(13 downto 0); + vram_D: in std_logic_vector(7 downto 0); + color: out std_logic_vector(3 downto 0)); + end component; + + signal bg_y: unsigned(7 downto 0); + signal bg_vram_A: std_logic_vector(13 downto 0); + signal bg_color: std_logic_vector(4 downto 0); + signal bg_priority: std_logic; + + signal spr_vram_A: std_logic_vector(13 downto 0); + signal spr_color: std_logic_vector(3 downto 0); + + signal line_reset: std_logic; + +begin + + process (y,bg_scroll_y) + variable sum: unsigned(8 downto 0); + begin + sum := ('0'&y)+('0'&bg_scroll_y); + if (sum>=224) then + sum := sum-224; + end if; + bg_y <= sum(7 downto 0); + end process; + + line_reset <= '1' when x=512-16 else '0'; + + vdp_bg_inst: vdp_background + port map ( + clk => clk, + table_address => bg_address, + reset => line_reset, + disable_hscroll=> disable_hscroll, + scroll_x => bg_scroll_x, + y => bg_y, + + vram_A => bg_vram_A, + vram_D => vram_D, + color => bg_color, + priority => bg_priority); + + vdp_spr_inst: vdp_sprites + port map ( + clk => clk, + table_address => spr_address, + char_high_bit => spr_high_bit, + tall => spr_tall, + x => x, + y => y, + + vram_A => spr_vram_A, + vram_D => vram_D, + color => spr_color); + + process (x, y, bg_priority, spr_color, bg_color, overscan) + variable spr_active : boolean; + variable bg_active : boolean; + begin + if x<256 and y<192 and (mask_column0='0' or x>=8) then + spr_active := not (spr_color="0000"); + bg_active := not (bg_color(3 downto 0)="0000"); + if (bg_priority='0' and spr_active) or (bg_priority='1' and not bg_active) then + cram_A <= "1"&spr_color; + else + cram_A <= bg_color; + end if; + else + cram_A <= "1"&overscan; + end if; + end process; + + vram_A <= spr_vram_A when x>=256 and x<384 else bg_vram_A; + + color <= cram_D; + +end Behavioral; + diff --git a/Sega - SG1000/rtl/vdp/vdp_sprite_shifter.vhd b/Sega - SG1000/rtl/vdp/vdp_sprite_shifter.vhd new file mode 100644 index 00000000..8c8d4e9c --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp_sprite_shifter.vhd @@ -0,0 +1,48 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity vpd_sprite_shifter is + Port( clk : in std_logic; + x : in unsigned (7 downto 0); + spr_x : in unsigned (7 downto 0); + spr_d0: in std_logic_vector (7 downto 0); + spr_d1: in std_logic_vector (7 downto 0); + spr_d2: in std_logic_vector (7 downto 0); + spr_d3: in std_logic_vector (7 downto 0); + color : out std_logic_vector (3 downto 0); + active: out std_logic); +end vpd_sprite_shifter; + +architecture Behavioral of vpd_sprite_shifter is + + signal count : integer range 0 to 8; + signal shift0 : std_logic_vector (7 downto 0) := (others=>'0'); + signal shift1 : std_logic_vector (7 downto 0) := (others=>'0'); + signal shift2 : std_logic_vector (7 downto 0) := (others=>'0'); + signal shift3 : std_logic_vector (7 downto 0) := (others=>'0'); + +begin + + process (clk) + begin + if rising_edge(clk) then + if spr_x=x then + shift0 <= spr_d0; + shift1 <= spr_d1; + shift2 <= spr_d2; + shift3 <= spr_d3; + else + shift0 <= shift0(6 downto 0)&"0"; + shift1 <= shift1(6 downto 0)&"0"; + shift2 <= shift2(6 downto 0)&"0"; + shift3 <= shift3(6 downto 0)&"0"; + end if; + end if; + end process; + + color <= shift3(7)&shift2(7)&shift1(7)&shift0(7); + active <= shift3(7) or shift2(7) or shift1(7) or shift0(7); + +end Behavioral; + diff --git a/Sega - SG1000/rtl/vdp/vdp_sprites.vhd b/Sega - SG1000/rtl/vdp/vdp_sprites.vhd new file mode 100644 index 00000000..18dbdd95 --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp_sprites.vhd @@ -0,0 +1,188 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.NUMERIC_STD.ALL; + +entity vdp_sprites is + port (clk : in std_logic; + table_address : in STD_LOGIC_VECTOR (13 downto 8); + char_high_bit : in std_logic; + tall : in std_logic; + vram_A : out STD_LOGIC_VECTOR (13 downto 0); + vram_D : in STD_LOGIC_VECTOR (7 downto 0); + x : in unsigned (8 downto 0); + y : in unsigned (7 downto 0); + color : out STD_LOGIC_VECTOR (3 downto 0)); +end vdp_sprites; + +architecture Behavioral of vdp_sprites is + + component vpd_sprite_shifter is + port( clk : in std_logic; + x : in unsigned (7 downto 0); + spr_x : in unsigned (7 downto 0); + spr_d0: in std_logic_vector (7 downto 0); + spr_d1: in std_logic_vector (7 downto 0); + spr_d2: in std_logic_vector (7 downto 0); + spr_d3: in std_logic_vector (7 downto 0); + color : out std_logic_vector (3 downto 0); + active: out std_logic); + end component; + + constant WAITING: integer := 0; + constant COMPARE: integer := 1; + constant LOAD_N: integer := 2; + constant LOAD_X: integer := 3; + constant LOAD_0: integer := 4; + constant LOAD_1: integer := 5; + constant LOAD_2: integer := 6; + constant LOAD_3: integer := 7; + + signal state: integer := WAITING; + signal count: integer range 0 to 7; + signal index: unsigned(5 downto 0); + signal data_address: std_logic_vector(13 downto 2); + + type tenable is array (0 to 7) of boolean; + type tx is array (0 to 7) of unsigned(7 downto 0); + type tdata is array (0 to 7) of std_logic_vector(7 downto 0); + signal enable: tenable; + signal spr_x: tx; + signal spr_d0: tdata; + signal spr_d1: tdata; + signal spr_d2: tdata; + signal spr_d3: tdata; + + type tcolor is array (0 to 7) of std_logic_vector(3 downto 0); + signal spr_color: tcolor; + signal active: std_logic_vector(7 downto 0); + +begin + shifters: + for i in 0 to 7 generate + begin + shifter: vpd_sprite_shifter + port map(clk => clk, + x => x(7 downto 0), + spr_x => spr_x(i), + spr_d0=> spr_d0(i), + spr_d1=> spr_d1(i), + spr_d2=> spr_d2(i), + spr_d3=> spr_d3(i), + color => spr_color(i), + active=> active(i)); + end generate; + + with state select + vram_a <= table_address&"00"&std_logic_vector(index) when COMPARE, + table_address&"1"&std_logic_vector(index)&"1" when LOAD_N, + table_address&"1"&std_logic_vector(index)&"0" when LOAD_X, + data_address&"00" when LOAD_0, + data_address&"01" when LOAD_1, + data_address&"10" when LOAD_2, + data_address&"11" when LOAD_3, + (others=>'0') when others; + + process (clk) + variable y9 : unsigned(8 downto 0); + variable d9 : unsigned(8 downto 0); + variable delta : unsigned(8 downto 0); + begin + if rising_edge(clk) then + + if x=255 then + count <= 0; + enable <= (others=>false); + state <= COMPARE; + index <= (others=>'0'); + + else + y9 := "0"&y; + d9 := "0"&unsigned(vram_D); + if d9>=240 then + d9 := d9-256; + end if; + delta := y9-d9; + + case state is + when COMPARE => + if d9=208 then + state <= WAITING; -- stop + elsif 0<=delta and ((delta<8 and tall='0') or (delta<16 and tall='1')) then + enable(count) <= true; + data_address(5 downto 2) <= std_logic_vector(delta(3 downto 0)); + state <= LOAD_N; + else + if index<63 then + index <= index+1; + else + state <= WAITING; + end if; + end if; + + when LOAD_N => + data_address(13) <= char_high_bit; + data_address(12 downto 6) <= vram_d(7 downto 1); + if tall='0' then + data_address(5) <= vram_d(0); + end if; + state <= LOAD_X; + + when LOAD_X => + spr_x(count) <= unsigned(vram_d); + state <= LOAD_0; + + when LOAD_0 => + spr_d0(count) <= vram_d; + state <= LOAD_1; + + when LOAD_1 => + spr_d1(count) <= vram_d; + state <= LOAD_2; + + when LOAD_2 => + spr_d2(count) <= vram_d; + state <= LOAD_3; + + when LOAD_3 => + spr_d3(count) <= vram_d; + if (count<7) then + state <= COMPARE; + index <= index+1; + count <= count+1; + else + state <= WAITING; + end if; + + when others => + end case; + end if; + end if; + end process; + + process (clk) + begin + if rising_edge(clk) then + if enable(0) and active(0)='1' then + color <= spr_color(0); + elsif enable(1) and active(1)='1' then + color <= spr_color(1); + elsif enable(2) and active(2)='1' then + color <= spr_color(2); + elsif enable(3) and active(3)='1' then + color <= spr_color(3); + elsif enable(4) and active(4)='1' then + color <= spr_color(4); + elsif enable(5) and active(5)='1' then + color <= spr_color(5); + elsif enable(6) and active(6)='1' then + color <= spr_color(6); + elsif enable(7) and active(7)='1' then + color <= spr_color(7); + else + color <= (others=>'0'); + end if; + end if; + end process; + +end Behavioral; + diff --git a/Sega - SG1000/rtl/vdp/vdp_vram.vhd b/Sega - SG1000/rtl/vdp/vdp_vram.vhd new file mode 100644 index 00000000..10bfd18a --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vdp_vram.vhd @@ -0,0 +1,44 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; + +library UNISIM; +use UNISIM.vcomponents.all; + +entity vdp_vram is + port ( + cpu_clk: in STD_LOGIC; + cpu_WE: in STD_LOGIC; + cpu_A: in STD_LOGIC_VECTOR (13 downto 0); + cpu_D_in: in STD_LOGIC_VECTOR (7 downto 0); + cpu_D_out: out STD_LOGIC_VECTOR (7 downto 0); + vdp_clk: in STD_LOGIC; + vdp_A: in STD_LOGIC_VECTOR (13 downto 0); + vdp_D_out: out STD_LOGIC_VECTOR (7 downto 0)); +end vdp_vram; + +architecture Behavioral of vdp_vram is +begin + ram_blocks: + for b in 0 to 7 generate + begin + inst: RAMB16_S1_S1 + port map ( + CLKA => cpu_clk, + ADDRA => cpu_A, + DIA => cpu_D_in(b downto b), + DOA => cpu_D_out(b downto b), + ENA => '1', + SSRA => '0', + WEA => cpu_WE, + + CLKB => not vdp_clk, + ADDRB => vdp_A, + DIB => "0", + DOB => vdp_D_out(b downto b), + ENB => '1', + SSRB => '0', + WEB => '0' + ); + end generate; + +end Behavioral; diff --git a/Sega - SG1000/rtl/vdp/vram.hex b/Sega - SG1000/rtl/vdp/vram.hex new file mode 100644 index 00000000..f2bf746c --- /dev/null +++ b/Sega - SG1000/rtl/vdp/vram.hex @@ -0,0 +1,98 @@ +:020000040000FA +:2084000000000000000000000000000000000000000000000000000000000000000000005C +:208420001818181818181818181818181818181818181818000000001818181800000000FC +:208440006C6C6C6C6C6C6C6C000000000000000000000000000000000000000000000000BC +:208460006C6C6C6C6C6C6C6CFEFEFEFE6C6C6C6CFEFEFEFE6C6C6C6C6C6C6C6C000000009C +:20848000181818183E3E3E3E606060603C3C3C3C060606067C7C7C7C1818181800000000AC +:2084A0000000000066666666ACACACACD8D8D8D8363636366A6A6A6ACCCCCCCC0000000064 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SG1000/sg1000.qpf new file mode 100644 index 00000000..c0a2f737 --- /dev/null +++ b/Sega - SG1000/sg1000.qpf @@ -0,0 +1,30 @@ +# -------------------------------------------------------------------------- # +# +# 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. +# +# -------------------------------------------------------------------------- # +# +# Quartus II 64-Bit +# Version 13.0.1 Build 232 06/12/2013 Service Pack 1 SJ Full Version +# Date created = 20:36:09 September 21, 2018 +# +# -------------------------------------------------------------------------- # + +QUARTUS_VERSION = "13.0" +DATE = "20:36:09 September 21, 2018" + +# Revisions + +PROJECT_REVISION = "sg1000" diff --git a/Sega - SG1000/sg1000.qsf b/Sega - SG1000/sg1000.qsf new file mode 100644 index 00000000..7c9e75b6 --- /dev/null +++ b/Sega - SG1000/sg1000.qsf @@ -0,0 +1,76 @@ +# -------------------------------------------------------------------------- # +# +# 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. +# +# -------------------------------------------------------------------------- # +# +# Quartus II 64-Bit +# Version 13.0.1 Build 232 06/12/2013 Service Pack 1 SJ Full Version +# Date created = 20:36:09 September 21, 2018 +# +# -------------------------------------------------------------------------- # +# +# Notes: +# +# 1) The default values for assignments are stored in the file: +# sg1000_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. +# +# -------------------------------------------------------------------------- # + + +set_global_assignment -name FAMILY "Cyclone III" +set_global_assignment -name DEVICE EP3C25E144C8 +set_global_assignment -name TOP_LEVEL_ENTITY sg1000_top +set_global_assignment -name ORIGINAL_QUARTUS_VERSION "13.0 SP1" +set_global_assignment -name PROJECT_CREATION_TIME_DATE "20:36:09 SEPTEMBER 21, 2018" +set_global_assignment -name LAST_QUARTUS_VERSION "13.0 SP1" +set_global_assignment -name PROJECT_OUTPUT_DIRECTORY output_files +set_global_assignment -name MIN_CORE_JUNCTION_TEMP 0 +set_global_assignment -name MAX_CORE_JUNCTION_TEMP 85 +set_global_assignment -name DEVICE_FILTER_PACKAGE TQFP +set_global_assignment -name DEVICE_FILTER_PIN_COUNT 144 +set_global_assignment -name DEVICE_FILTER_SPEED_GRADE 8 +set_global_assignment -name ERROR_CHECK_FREQUENCY_DIVISOR 1 +set_global_assignment -name NOMINAL_CORE_SUPPLY_VOLTAGE 1.2V +set_global_assignment -name POWER_PRESET_COOLING_SOLUTION "23 MM HEAT SINK WITH 200 LFPM AIRFLOW" +set_global_assignment -name POWER_BOARD_THERMAL_MODEL "NONE (CONSERVATIVE)" +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 +set_global_assignment -name VHDL_FILE rtl/vdp/vdp_sprites.vhd +set_global_assignment -name VHDL_FILE rtl/vdp/vdp_sprite_shifter.vhd +set_global_assignment -name VHDL_FILE rtl/vdp/vdp_main.vhd +set_global_assignment -name VHDL_FILE rtl/vdp/vdp_cram.vhd +set_global_assignment -name VHDL_FILE rtl/vdp/vdp_background.vhd +set_global_assignment -name VHDL_FILE rtl/vdp/vdp.vhd +set_global_assignment -name VHDL_FILE rtl/psg/psg_tone.vhd +set_global_assignment -name VHDL_FILE rtl/psg/psg_noise.vhd +set_global_assignment -name VHDL_FILE rtl/psg/psg.vhd +set_global_assignment -name VHDL_FILE rtl/t80/T80se.vhd +set_global_assignment -name VHDL_FILE rtl/t80/T80_Reg.vhd +set_global_assignment -name VHDL_FILE rtl/t80/T80_Pack.vhd +set_global_assignment -name VHDL_FILE rtl/t80/T80_MCode.vhd +set_global_assignment -name VHDL_FILE rtl/t80/T80_ALU.vhd +set_global_assignment -name VHDL_FILE rtl/t80/T80.vhd +set_global_assignment -name VHDL_FILE rtl/spram.vhd +set_global_assignment -name SYSTEMVERILOG_FILE rtl/sg1000_top.sv +set_global_assignment -name VHDL_FILE rtl/dpram.vhd +set_instance_assignment -name PARTITION_HIERARCHY root_partition -to | -section_id Top \ No newline at end of file diff --git a/Sega - SG1000/sgcpu.png b/Sega - SG1000/sgcpu.png new file mode 100644 index 00000000..663c8d61 Binary files /dev/null and b/Sega - SG1000/sgcpu.png differ diff --git a/Sega - SG1000/sgio.png b/Sega - SG1000/sgio.png new file mode 100644 index 00000000..3d62c982 Binary files /dev/null and b/Sega - SG1000/sgio.png differ diff --git a/Sega - SG1000/sgjoy.png b/Sega - SG1000/sgjoy.png new file mode 100644 index 00000000..4d374b1a Binary files /dev/null and b/Sega - SG1000/sgjoy.png differ diff --git a/Sega - SG1000/sgpsg.png b/Sega - SG1000/sgpsg.png new file mode 100644 index 00000000..ee68df3d Binary files /dev/null and b/Sega - SG1000/sgpsg.png differ diff --git a/Sega - SG1000/sgvdp.png b/Sega - SG1000/sgvdp.png new file mode 100644 index 00000000..06abf901 Binary files /dev/null and b/Sega - SG1000/sgvdp.png differ