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------------------------------------------------------------------------------- -- -- $Id: t400_mnemonic_pack-p.vhd 179 2009-04-01 19:48:38Z arniml $ -- -- Copyright (c) 2008, Arnim Laeuger (arniml@opencores.org) -- -- All rights reserved -- ------------------------------------------------------------------------------- use work.t400_pack.byte_t; package t400_mnemonic_pack is -- Mnemonics ---------------------------------------------------------------- type mnemonic_t is (-- Arithmetic instructions MN_ASC, MN_ADD, MN_ADT, MN_AISC, MN_CASC, MN_CLRA, MN_COMP, MN_NOP, MN_C, MN_XOR, -- Transfer of control instructions MN_JID, MN_JMP, MN_JP_JSRP, MN_JSR, MN_RET, MN_RETSK, -- Memory reference instructions MN_LD, MN_LDD_XAD, MN_LQID, MN_RMB, MN_SMB, MN_STII, MN_X, MN_XDS, MN_XIS, -- Register reference instructions MN_CAB, MN_CBA, MN_LBI, MN_XABR, -- Test instructions MN_SKC, MN_SKE, MN_SKMBZ, MN_SKT, -- Input/output instructions MN_EXT, MN_XAS); type mnemonic_rec_t is record mnemonic : mnemonic_t; multi_byte : boolean; end record; function decode_opcode_f(opcode : in byte_t; opt_type : in integer) return mnemonic_rec_t; end t400_mnemonic_pack; library ieee; use ieee.std_logic_1164.all; use work.t400_opt_pack.t400_opt_type_410_c; package body t400_mnemonic_pack is function decode_opcode_f(opcode : in byte_t; opt_type : in integer) return mnemonic_rec_t is variable t41x_type_v : boolean; variable mnemonic_v : mnemonic_t; variable multi_byte_v : boolean; variable result_v : mnemonic_rec_t; begin -- default assignment mnemonic_v := MN_NOP; multi_byte_v := false; -- determine type t41x_type_v := opt_type = t400_opt_type_410_c; case opcode is -- Mnemonic ASC---------------------------------------------------------- when "00110000" => mnemonic_v := MN_ASC; -- Mnemonic ADD --------------------------------------------------------- when "00110001" => mnemonic_v := MN_ADD; -- Mnemonic ADT --------------------------------------------------------- when "01001010" => if not t41x_type_v then mnemonic_v := MN_ADT; end if; -- Mnemonic AISC -------------------------------------------------------- when "01010001" | "01010010" | "01010011" | "01010100" | "01010101" | "01010110" | "01010111" | "01011000" | "01011001" | "01011010" | "01011011" | "01011100" | "01011101" | "01011110" | "01011111" => mnemonic_v := MN_AISC; -- Mnemonic CASC -------------------------------------------------------- when "00010000" => if not t41x_type_v then mnemonic_v := MN_CASC; end if; -- Mnemonic CLRA -------------------------------------------------------- when "00000000" => mnemonic_v := MN_CLRA; -- Mnemonic COMP -------------------------------------------------------- when "01000000" => mnemonic_v := MN_COMP; -- Mnemonic NOP --------------------------------------------------------- when "01000100" => mnemonic_v := MN_NOP; -- Mnemonic C ----------------------------------------------------------- when "00110010" | -- RC "00100010" => -- SC mnemonic_v := MN_C; -- Mnemonic XOR --------------------------------------------------------- when "00000010" => mnemonic_v := MN_XOR; -- Mnemonic JID --------------------------------------------------------- when "11111111" => mnemonic_v := MN_JID; -- Mnemonic JMP --------------------------------------------------------- when "01100000" | "01100001" | "01100010" | "01100011" => mnemonic_v := MN_JMP; multi_byte_v := true; -- Mnemonic JP_JSRP ----------------------------------------------------- when "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" | "10100000" | "10100001" | "10100010" | "10100011" | "10100100" | "10100101" | "10100110" | "10100111" | "10101000" | "10101001" | "10101010" | "10101011" | "10101100" | "10101101" | "10101110" | "10101111" | "10110000" | "10110001" | "10110010" | "10110011" | "10110100" | "10110101" | "10110110" | "10110111" | "10111000" | "10111001" | "10111010" | "10111011" | "10111100" | "10111101" | "10111110" | "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" => mnemonic_v := MN_JP_JSRP; -- Mnemonic JSR --------------------------------------------------------- when "01101000" | "01101001" | "01101010" | "01101011" => mnemonic_v := MN_JSR; multi_byte_v := true; -- Mnemonic RET --------------------------------------------------------- when "01001000" => mnemonic_v := MN_RET; -- Mnemonic RETSK ------------------------------------------------------- when "01001001" => mnemonic_v := MN_RETSK; -- Mnemonic LD ---------------------------------------------------------- when "00000101" | "00010101" | "00100101" | "00110101" => mnemonic_v := MN_LD; -- Mnemonic LDD_XAD ----------------------------------------------------- when "00100011" => mnemonic_v := MN_LDD_XAD; multi_byte_v := true; -- Mnemonic LQID -------------------------------------------------------- when "10111111" => mnemonic_v := MN_LQID; -- Mnemonic RMB --------------------------------------------------------- when "01001100" | "01000101" | "01000010" | "01000011" => mnemonic_v := MN_RMB; -- Mnemonic SMB --------------------------------------------------------- when "01001101" | "01000111" | "01000110" | "01001011" => mnemonic_v := MN_SMB; -- Mnemonic STII -------------------------------------------------------- when "01110000" | "01110001" | "01110010" | "01110011" | "01110100" | "01110101" | "01110110" | "01110111" | "01111000" | "01111001" | "01111010" | "01111011" | "01111100" | "01111101" | "01111110" | "01111111" => mnemonic_v := MN_STII; -- Mnemonic X ----------------------------------------------------------- when "00000110" | "00010110" | "00100110" | "00110110" => mnemonic_v := MN_X; -- Mnemonic XDS --------------------------------------------------------- when "00000111" | "00010111" | "00100111" | "00110111" => mnemonic_v := MN_XDS; -- Mnemonic XIS --------------------------------------------------------- when "00000100" | "00010100" | "00100100" | "00110100" => mnemonic_v := MN_XIS; -- Mnemonic CAB --------------------------------------------------------- when "01010000" => mnemonic_v := MN_CAB; -- Mnemonic CBA --------------------------------------------------------- when "01001110" => mnemonic_v := MN_CBA; -- Mnemonic LBI --------------------------------------------------------- when "00001000" | "00001001" | "00001010" | "00001011" | "00001100" | "00001101" | "00001110" | "00001111" | "00011000" | "00011001" | "00011010" | "00011011" | "00011100" | "00011101" | "00011110" | "00011111" | "00101000" | "00101001" | "00101010" | "00101011" | "00101100" | "00101101" | "00101110" | "00101111" | "00111000" | "00111001" | "00111010" | "00111011" | "00111100" | "00111101" | "00111110" | "00111111" => mnemonic_v := MN_LBI; -- Mnemonic XABR -------------------------------------------------------- when "00010010" => if not t41x_type_v then mnemonic_v := MN_XABR; end if; -- Mnemonic SKC --------------------------------------------------------- when "00100000" => mnemonic_v := MN_SKC; -- Mnemonic SKE --------------------------------------------------------- when "00100001" => mnemonic_v := MN_SKE; -- Mnemonic SKMBZ ------------------------------------------------------- when "00000001" | "00010001" | "00000011" | "00010011" => mnemonic_v := MN_SKMBZ; -- Mnemonic SKT --------------------------------------------------------- when "01000001" => if not t41x_type_v then mnemonic_v := MN_SKT; end if; -- Mnemonic XAS --------------------------------------------------------- when "01001111" => mnemonic_v := MN_XAS; -- Mnemonic EXT --------------------------------------------------------- when "00110011" => mnemonic_v := MN_EXT; multi_byte_v := true; when others => null; end case; result_v.mnemonic := mnemonic_v; result_v.multi_byte := multi_byte_v; return result_v; end; end t400_mnemonic_pack;