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Gehstock.Mist_FPGA/common/CPU/t48/decoder_pack-p.vhd
Gyorgy Szombathelyi 6d2e39a333 Update T48
2021-07-22 11:06:33 +02:00

429 lines
19 KiB
VHDL
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-------------------------------------------------------------------------------
--
-- $Id: decoder_pack-p.vhd 295 2009-04-01 19:32:48Z arniml $
--
-- Copyright (c) 2004, Arnim Laeuger (arniml@opencores.org)
--
-- All rights reserved
--
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use work.t48_pack.word_t;
package t48_decoder_pack is
-----------------------------------------------------------------------------
-- The Mnemonics.
-----------------------------------------------------------------------------
type mnemonic_t is (MN_ADD,
MN_ADD_A_DATA,
MN_ANL,
MN_ANL_A_DATA,
MN_ANL_EXT,
MN_CALL,
MN_CLR_A,
MN_CLR_C,
MN_CLR_F,
MN_CPL_A,
MN_CPL_C,
MN_CPL_F,
MN_DA,
MN_DEC,
MN_DIS_EN_I,
MN_DIS_EN_TCNTI,
MN_DJNZ,
MN_ENT0_CLK,
MN_IN,
MN_INC,
MN_INS,
MN_JBB,
MN_JC,
MN_JF,
MN_JMP,
MN_JMPP,
MN_JNI,
MN_JT,
MN_JTF,
MN_JZ,
MN_MOV_A_DATA,
MN_MOV_A_PSW,
MN_MOV_A_RR,
MN_MOV_PSW_A,
MN_MOV_RR,
MN_MOV_RR_DATA,
MN_MOV_T,
MN_MOVD_A_PP,
MN_MOVP,
MN_MOVX,
MN_NOP,
MN_ORL,
MN_ORL_A_DATA,
MN_ORL_EXT,
MN_OUTD_PP_A,
MN_OUTL_EXT,
MN_RET,
MN_RL,
MN_RR,
MN_SEL_MB,
MN_SEL_RB,
MN_STOP_TCNT,
MN_STRT,
MN_SWAP,
MN_XCH,
MN_XRL,
MN_XRL_A_DATA);
type mnemonic_rec_t is
record
mnemonic : mnemonic_t;
multi_cycle : boolean;
end record;
function decode_opcode_f(opcode : in word_t) return
mnemonic_rec_t;
end t48_decoder_pack;
package body t48_decoder_pack is
function decode_opcode_f(opcode : in word_t) return
mnemonic_rec_t is
variable mnemonic_v : mnemonic_t;
variable multi_cycle_v : boolean;
variable result_v : mnemonic_rec_t;
begin
-- default assignment
mnemonic_v := MN_NOP;
multi_cycle_v := false;
case opcode is
-- Mnemonic ADD ---------------------------------------------------------
when "01101000" | "01101001" | "01101010" | "01101011" | -- ADD A, Rr
"01101100" | "01101101" | "01101110" | "01101111" | --
"01100000" | "01100001" | -- ADD A, @ Rr
"01111000" | "01111001" | "01111010" | "01111011" | -- ADDC A, Rr
"01111100" | "01111101" | "01111110" | "01111111" | --
"01110000" | "01110001" => -- ADDC A, @ Rr
mnemonic_v := MN_ADD;
-- Mnemonic ADD_A_DATA --------------------------------------------------
when "00000011" | -- ADD A, data
"00010011" => -- ADDC A, data
mnemonic_v := MN_ADD_A_DATA;
multi_cycle_v := true;
-- Mnemonic ANL ---------------------------------------------------------
when "01011000" | "01011001" | "01011010" | "01011011" | -- ANL A, Rr
"01011100" | "01011101" | "01011110" | "01011111" | --
"01010000" | "01010001" => -- ANL A, @ Rr
mnemonic_v := MN_ANL;
-- Mnemonic ANL_A_DATA --------------------------------------------------
when "01010011" => -- ANL A, data
mnemonic_v := MN_ANL_A_DATA;
multi_cycle_v := true;
-- Mnemonic ANL_EXT -----------------------------------------------------
when "10011000" | -- ANL BUS, data
"10011001" | "10011010" => -- ANL PP, data
mnemonic_v := MN_ANL_EXT;
multi_cycle_v := true;
-- Mnemonic CALL --------------------------------------------------------
when "00010100" | "00110100" | "01010100" | "01110100" | -- CALL addr
"10010100" | "10110100" | "11010100" | "11110100" => --
mnemonic_v := MN_CALL;
multi_cycle_v := true;
-- Mnemonic CLR_A -------------------------------------------------------
when "00100111" => -- CLR A
mnemonic_v := MN_CLR_A;
-- Mnemonic CLR_C -------------------------------------------------------
when "10010111" => -- CLR C
mnemonic_v := MN_CLR_C;
-- Mnemonic CLR_F -------------------------------------------------------
when "10000101" | -- CLR F0
"10100101" =>
mnemonic_v := MN_CLR_F;
-- Mnemonic CPL_A -------------------------------------------------------
when "00110111" => -- CPL A
mnemonic_v := MN_CPL_A;
-- Mnemonic CPL_C -------------------------------------------------------
when "10100111" => -- CPL C
mnemonic_v := MN_CPL_C;
-- Mnemonic CPL_F -------------------------------------------------------
when "10010101" | -- CPL F0
"10110101" => -- CPL F1
mnemonic_v := MN_CPL_F;
-- Mnemonic DA ----------------------------------------------------------
when "01010111" => -- DA D
mnemonic_v := MN_DA;
-- Mnemonic DEC ---------------------------------------------------------
when "11001000" | "11001001" | "11001010" | "11001011" | -- DEC Rr
"11001100" | "11001101" | "11001110" | "11001111" | --
"00000111" => -- DEC A
mnemonic_v := MN_DEC;
-- Mnemonic DIS_EN_I ----------------------------------------------------
when "00010101" | -- DIS I
"00000101" => -- EN I
mnemonic_v := MN_DIS_EN_I;
-- Mnemonic DIS_EN_TCNTI ------------------------------------------------
when "00110101" | -- DIS TCNTI
"00100101" => -- EN TCNTI
mnemonic_v := MN_DIS_EN_TCNTI;
-- Mnemonic DJNZ --------------------------------------------------------
when "11101000" | "11101001" | "11101010" | "11101011" | -- DJNZ Rr, addr
"11101100" | "11101101" | "11101110" | "11101111" => --
mnemonic_v := MN_DJNZ;
multi_cycle_v := true;
-- Mnemonic ENT0_CLK ----------------------------------------------------
when "01110101" => -- ENT0 CLK
mnemonic_v := MN_ENT0_CLK;
-- Mnemonic IN ----------------------------------------------------------
when "00001001" | "00001010" => -- IN A, Pp
mnemonic_v := MN_IN;
multi_cycle_v := true;
-- Mnemonic INC ---------------------------------------------------------
when "00010111" | -- INC A
"00011000" | "00011001" | "00011010" | "00011011" | -- INC Rr
"00011100" | "00011101" | "00011110" | "00011111" | --
"00010000" | "00010001" => -- INC @ Rr
mnemonic_v := MN_INC;
-- Mnemonic INS ---------------------------------------------------------
when "00001000" => -- INS A, BUS
mnemonic_v := MN_INS;
multi_cycle_v := true;
-- Mnemonic JBB ---------------------------------------------------------
when "00010010" | "00110010" | "01010010" | "01110010" | -- JBb addr
"10010010" | "10110010" | "11010010" | "11110010" => --
mnemonic_v := MN_JBB;
multi_cycle_v := true;
-- Mnemonic JC ----------------------------------------------------------
when "11110110" | -- JC addr
"11100110" => -- JNC addr
mnemonic_v := MN_JC;
multi_cycle_v := true;
-- Mnemonic JF ----------------------------------------------------------
when "10110110" | -- JF0 addr
"01110110" => -- JF1 addr
mnemonic_v := MN_JF;
multi_cycle_v := true;
-- Mnemonic JMP ---------------------------------------------------------
when "00000100" | "00100100" | "01000100" | "01100100" | -- JMP addr
"10000100" | "10100100" | "11000100" | "11100100" => --
mnemonic_v := MN_JMP;
multi_cycle_v := true;
-- Mnemonic JMPP --------------------------------------------------------
when "10110011" => -- JMPP @ A
mnemonic_v := MN_JMPP;
multi_cycle_v := true;
-- Mnemonic JNI ---------------------------------------------------------
when "10000110" => -- JNI addr
mnemonic_v := MN_JNI;
multi_cycle_v := true;
-- Mnemonic JT ----------------------------------------------------------
when "00100110" | -- JNT0 addr
"01000110" | -- JNT1 addr
"00110110" | -- JT0 addr
"01010110" => -- JT1 addr
mnemonic_v := MN_JT;
multi_cycle_v := true;
-- Mnemonic JTF ---------------------------------------------------------
when "00010110" => -- JTF addr
mnemonic_v := MN_JTF;
multi_cycle_v := true;
-- Mnemonic JZ ----------------------------------------------------------
when "10010110" | -- JNZ addr
"11000110" => -- JZ addr
mnemonic_v := MN_JZ;
multi_cycle_v := true;
-- Mnemonic MOV_A_DATA --------------------------------------------------
when "00100011" => -- MOV A, data
mnemonic_v := MN_MOV_A_DATA;
multi_cycle_v := true;
-- Mnemonic MOV_A_PSW ---------------------------------------------------
when "11000111" => -- MOV A, PSW
mnemonic_v := MN_MOV_A_PSW;
-- Mnemonic MOV_A_RR ----------------------------------------------------
when "11111000" | "11111001" | "11111010" | "11111011" | -- MOV A, Rr
"11111100" | "11111101" | "11111110" | "11111111" | --
"11110000" | "11110001" => -- MOV A, @ Rr
mnemonic_v := MN_MOV_A_RR;
-- Mnemonic MOV_PSW_A ---------------------------------------------------
when "11010111" => -- MOV PSW, A
mnemonic_v := MN_MOV_PSW_A;
-- Mnemonic MOV_RR ------------------------------------------------------
when "10101000" | "10101001" | "10101010" | "10101011" | -- MOV Rr, A
"10101100" | "10101101" | "10101110" | "10101111" | --
"10100000" | "10100001" => -- MOV @ Rr, A
mnemonic_v := MN_MOV_RR;
-- Mnemonic MOV_RR_DATA -------------------------------------------------
when "10111000" | "10111001" | "10111010" | "10111011" | -- MOV Rr, data
"10111100" | "10111101" | "10111110" | "10111111" | --
"10110000" | "10110001" => -- MOV @ Rr, data
mnemonic_v := MN_MOV_RR_DATA;
multi_cycle_v := true;
-- Mnemonic MOV_T -------------------------------------------------------
when "01100010" | -- MOV T, A
"01000010" => -- MOV A, T
mnemonic_v := MN_MOV_T;
-- Mnemonic MOVD_A_PP ---------------------------------------------------
when "00001100" | "00001101" | "00001110" | "00001111" => -- MOVD A, Pp
mnemonic_v := MN_MOVD_A_PP;
multi_cycle_v := true;
-- Mnemonic MOVP --------------------------------------------------------
when "10100011" | -- MOVP A, @ A
"11100011" => -- MOVP3 A, @ A
mnemonic_v := MN_MOVP;
multi_cycle_v := true;
-- Mnemonic MOVX --------------------------------------------------------
when "10000000" | "10000001" | -- MOVX A, @ Rr
"10010000" | "10010001" => -- MOVX @ Rr, A
mnemonic_v := MN_MOVX;
multi_cycle_v := true;
-- Mnemonic NOP ---------------------------------------------------------
when "00000000" => -- NOP
mnemonic_v := MN_NOP;
-- Mnemonic ORL ---------------------------------------------------------
when "01001000" | "01001001" | "01001010" | "01001011" | -- ORL A, Rr
"01001100" | "01001101" | "01001110" | "01001111" | --
"01000000" | "01000001" => -- ORL A, @ Rr
mnemonic_v := MN_ORL;
-- Mnemonic ORL_A_DATA --------------------------------------------------
when "01000011" => -- ORL A, data
mnemonic_v := MN_ORL_A_DATA;
multi_cycle_v := true;
-- Mnemonic ORL_EXT -----------------------------------------------------
when "10001000" | -- ORL BUS, data
"10001001" | "10001010" => -- ORL Pp, data
mnemonic_v := MN_ORL_EXT;
multi_cycle_v := true;
-- Mnemonic OUTD_PP_A ---------------------------------------------------
when "00111100" | "00111101" | "00111110" | "00111111" | -- MOVD Pp, A
"10011100" | "10011101" | "10011110" | "10011111" | -- ANLD PP, A
"10001100" | "10001101" | "10001110" | "10001111" => -- ORLD Pp, A
mnemonic_v := MN_OUTD_PP_A;
multi_cycle_v := true;
-- Mnemonic OUTL_EXT ----------------------------------------------------
when "00111001" | "00111010" | -- OUTL Pp, A
"00000010" => -- OUTL BUS, A
mnemonic_v := MN_OUTL_EXT;
multi_cycle_v := true;
-- Mnemonic RET ---------------------------------------------------------
when "10000011" | -- RET
"10010011" => -- RETR
mnemonic_v := MN_RET;
multi_cycle_v := true;
-- Mnemonic RL ----------------------------------------------------------
when "11100111" | -- RL A
"11110111" => -- RLC A
mnemonic_v := MN_RL;
-- Mnemonic RR ----------------------------------------------------------
when "01110111" | -- RR A
"01100111" => -- RRC A
mnemonic_v := MN_RR;
-- Mnemonic SEL_MB ------------------------------------------------------
when "11100101" | -- SEL MB0
"11110101" => -- SEL MB1
mnemonic_v := MN_SEL_MB;
-- Mnemonic SEL_RB ------------------------------------------------------
when "11000101" | -- SEL RB0
"11010101" => -- SEL RB1
mnemonic_v := MN_SEL_RB;
-- Mnemonic STOP_TCNT ---------------------------------------------------
when "01100101" => -- STOP TCNT
mnemonic_v := MN_STOP_TCNT;
-- Mnemonic START -------------------------------------------------------
when "01000101" | -- STRT CNT
"01010101" => -- STRT T
mnemonic_v := MN_STRT;
-- Mnemonic SWAP --------------------------------------------------------
when "01000111" => -- SWAP A
mnemonic_v := MN_SWAP;
-- Mnemonic XCH ---------------------------------------------------------
when "00101000" | "00101001" | "00101010" | "00101011" | -- XCH A, Rr
"00101100" | "00101101" | "00101110" | "00101111" | --
"00100000" | "00100001" | -- XCH A, @ Rr
"00110000" | "00110001" => -- XCHD A, @ Rr
mnemonic_v := MN_XCH;
-- Mnemonic XRL ---------------------------------------------------------
when "11011000" | "11011001" | "11011010" | "11011011" | -- XRL A, Rr
"11011100" | "11011101" | "11011110" | "11011111" | --
"11010000" | "11010001" => -- XRL A, @ Rr
mnemonic_v := MN_XRL;
-- Mnemonic XRL_A_DATA --------------------------------------------------
when "11010011" => -- XRL A, data
mnemonic_v := MN_XRL_A_DATA;
multi_cycle_v := true;
when others =>
-- pragma translate_off
assert now = 0 ns
report "Unknown opcode."
severity warning;
-- pragma translate_on
end case;
result_v.mnemonic := mnemonic_v;
result_v.multi_cycle := multi_cycle_v;
return result_v;
end;
end t48_decoder_pack;
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