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arniml |
-------------------------------------------------------------------------------
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--
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-- $Id: t400_mnemonic_pack-p.vhd,v 1.1 2008-05-01 19:52:37 arniml Exp $
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--
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-- Copyright (c) 2008, Arnim Laeuger (arniml@opencores.org)
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--
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-- All rights reserved
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--
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-------------------------------------------------------------------------------
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use work.t400_pack.byte_t;
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package t400_mnemonic_pack is
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-- Mnemonics ----------------------------------------------------------------
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type mnemonic_t is (-- Arithmetic instructions
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MN_ASC,
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MN_ADD,
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MN_ADT,
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MN_AISC,
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MN_CASC,
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MN_CLRA,
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MN_COMP,
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MN_NOP,
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MN_C,
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MN_XOR,
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-- Transfer of control instructions
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MN_JID,
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MN_JMP,
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MN_JP_JSRP,
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MN_JSR,
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MN_RET,
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MN_RETSK,
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-- Memory reference instructions
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MN_LD,
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MN_LDD_XAD,
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MN_LQID,
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MN_RMB,
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MN_SMB,
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MN_STII,
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MN_X,
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MN_XDS,
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MN_XIS,
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-- Register reference instructions
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MN_CAB,
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MN_CBA,
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MN_LBI,
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MN_XABR,
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-- Test instructions
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MN_SKC,
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MN_SKE,
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MN_SKMBZ,
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MN_SKT,
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-- Input/output instructions
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MN_EXT,
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MN_XAS);
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type mnemonic_rec_t is
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record
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mnemonic : mnemonic_t;
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multi_byte : boolean;
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end record;
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function decode_opcode_f(opcode : in byte_t;
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opt_type : in integer) return
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mnemonic_rec_t;
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end t400_mnemonic_pack;
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library ieee;
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use ieee.std_logic_1164.all;
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use work.t400_opt_pack.t400_opt_type_410_c;
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package body t400_mnemonic_pack is
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function decode_opcode_f(opcode : in byte_t;
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opt_type : in integer) return
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mnemonic_rec_t is
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variable t41x_type_v : boolean;
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variable mnemonic_v : mnemonic_t;
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variable multi_byte_v : boolean;
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variable result_v : mnemonic_rec_t;
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begin
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-- default assignment
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mnemonic_v := MN_NOP;
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multi_byte_v := false;
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-- determine type
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t41x_type_v := opt_type = t400_opt_type_410_c;
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case opcode is
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-- Mnemonic ASC----------------------------------------------------------
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when "00110000" =>
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mnemonic_v := MN_ASC;
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-- Mnemonic ADD ---------------------------------------------------------
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when "00110001" =>
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mnemonic_v := MN_ADD;
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-- Mnemonic ADT ---------------------------------------------------------
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when "01001010" =>
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if not t41x_type_v then
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mnemonic_v := MN_ADT;
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end if;
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-- Mnemonic AISC --------------------------------------------------------
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when "01010001" | "01010010" | "01010011" |
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"01010100" | "01010101" | "01010110" | "01010111" |
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"01011000" | "01011001" | "01011010" | "01011011" |
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"01011100" | "01011101" | "01011110" | "01011111" =>
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mnemonic_v := MN_AISC;
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-- Mnemonic CASC --------------------------------------------------------
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when "00010000" =>
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if not t41x_type_v then
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mnemonic_v := MN_CASC;
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end if;
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-- Mnemonic CLRA --------------------------------------------------------
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when "00000000" =>
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mnemonic_v := MN_CLRA;
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-- Mnemonic COMP --------------------------------------------------------
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when "01000000" =>
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mnemonic_v := MN_COMP;
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-- Mnemonic NOP ---------------------------------------------------------
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when "01000100" =>
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mnemonic_v := MN_NOP;
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-- Mnemonic C -----------------------------------------------------------
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when "00110010" | -- RC
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"00100010" => -- SC
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mnemonic_v := MN_C;
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-- Mnemonic XOR ---------------------------------------------------------
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when "00000010" =>
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mnemonic_v := MN_XOR;
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-- Mnemonic JID ---------------------------------------------------------
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when "11111111" =>
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mnemonic_v := MN_JID;
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-- Mnemonic JMP ---------------------------------------------------------
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when "01100000" | "01100001" | "01100010" | "01100011" =>
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mnemonic_v := MN_JMP;
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multi_byte_v := true;
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-- Mnemonic JP_JSRP -----------------------------------------------------
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when "10000000" | "10000001" | "10000010" | "10000011" |
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"10000100" | "10000101" | "10000110" | "10000111" |
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"10001000" | "10001001" | "10001010" | "10001011" |
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"10001100" | "10001101" | "10001110" | "10001111" |
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"10010000" | "10010001" | "10010010" | "10010011" |
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"10010100" | "10010101" | "10010110" | "10010111" |
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"10011000" | "10011001" | "10011010" | "10011011" |
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"10011100" | "10011101" | "10011110" | "10011111" |
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"10100000" | "10100001" | "10100010" | "10100011" |
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"10100100" | "10100101" | "10100110" | "10100111" |
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"10101000" | "10101001" | "10101010" | "10101011" |
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"10101100" | "10101101" | "10101110" | "10101111" |
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"10110000" | "10110001" | "10110010" | "10110011" |
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"10110100" | "10110101" | "10110110" | "10110111" |
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"10111000" | "10111001" | "10111010" | "10111011" |
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"10111100" | "10111101" | "10111110" |
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"11000000" | "11000001" | "11000010" | "11000011" |
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"11000100" | "11000101" | "11000110" | "11000111" |
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"11001000" | "11001001" | "11001010" | "11001011" |
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"11001100" | "11001101" | "11001110" | "11001111" |
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"11010000" | "11010001" | "11010010" | "11010011" |
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"11010100" | "11010101" | "11010110" | "11010111" |
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"11011000" | "11011001" | "11011010" | "11011011" |
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"11011100" | "11011101" | "11011110" | "11011111" |
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"11100000" | "11100001" | "11100010" | "11100011" |
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"11100100" | "11100101" | "11100110" | "11100111" |
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"11101000" | "11101001" | "11101010" | "11101011" |
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"11101100" | "11101101" | "11101110" | "11101111" |
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"11110000" | "11110001" | "11110010" | "11110011" |
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"11110100" | "11110101" | "11110110" | "11110111" |
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"11111000" | "11111001" | "11111010" | "11111011" |
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"11111100" | "11111101" | "11111110" =>
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mnemonic_v := MN_JP_JSRP;
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-- Mnemonic JSR ---------------------------------------------------------
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when "01101000" | "01101001" | "01101010" | "01101011" =>
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mnemonic_v := MN_JSR;
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multi_byte_v := true;
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-- Mnemonic RET ---------------------------------------------------------
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when "01001000" =>
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mnemonic_v := MN_RET;
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-- Mnemonic RETSK -------------------------------------------------------
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when "01001001" =>
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mnemonic_v := MN_RETSK;
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-- Mnemonic LD ----------------------------------------------------------
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when "00000101" | "00010101" | "00100101" | "00110101" =>
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mnemonic_v := MN_LD;
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-- Mnemonic LDD_XAD -----------------------------------------------------
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when "00100011" =>
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mnemonic_v := MN_LDD_XAD;
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multi_byte_v := true;
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-- Mnemonic LQID --------------------------------------------------------
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when "10111111" =>
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mnemonic_v := MN_LQID;
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-- Mnemonic RMB ---------------------------------------------------------
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when "01001100" | "01000101" | "01000010" | "01000011" =>
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mnemonic_v := MN_RMB;
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-- Mnemonic SMB ---------------------------------------------------------
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when "01001101" | "01000111" | "01000110" | "01001011" =>
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mnemonic_v := MN_SMB;
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-- Mnemonic STII --------------------------------------------------------
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when "01110000" | "01110001" | "01110010" | "01110011" |
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"01110100" | "01110101" | "01110110" | "01110111" |
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"01111000" | "01111001" | "01111010" | "01111011" |
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"01111100" | "01111101" | "01111110" | "01111111" =>
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mnemonic_v := MN_STII;
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-- Mnemonic X -----------------------------------------------------------
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when "00000110" | "00010110" | "00100110" | "00110110" =>
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mnemonic_v := MN_X;
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-- Mnemonic XDS ---------------------------------------------------------
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when "00000111" | "00010111" | "00100111" | "00110111" =>
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mnemonic_v := MN_XDS;
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-- Mnemonic XIS ---------------------------------------------------------
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when "00000100" | "00010100" | "00100100" | "00110100" =>
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mnemonic_v := MN_XIS;
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-- Mnemonic CAB ---------------------------------------------------------
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when "01010000" =>
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mnemonic_v := MN_CAB;
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-- Mnemonic CBA ---------------------------------------------------------
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when "01001110" =>
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mnemonic_v := MN_CBA;
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-- Mnemonic LBI ---------------------------------------------------------
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when "00001000" | "00001001" | "00001010" | "00001011" |
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"00001100" | "00001101" | "00001110" | "00001111" |
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"00011000" | "00011001" | "00011010" | "00011011" |
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"00011100" | "00011101" | "00011110" | "00011111" |
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"00101000" | "00101001" | "00101010" | "00101011" |
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"00101100" | "00101101" | "00101110" | "00101111" |
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"00111000" | "00111001" | "00111010" | "00111011" |
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"00111100" | "00111101" | "00111110" | "00111111" =>
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mnemonic_v := MN_LBI;
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-- Mnemonic XABR --------------------------------------------------------
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when "00010010" =>
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if not t41x_type_v then
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mnemonic_v := MN_XABR;
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end if;
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-- Mnemonic SKC ---------------------------------------------------------
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when "00100000" =>
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mnemonic_v := MN_SKC;
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-- Mnemonic SKE ---------------------------------------------------------
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when "00100001" =>
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mnemonic_v := MN_SKE;
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-- Mnemonic SKMBZ -------------------------------------------------------
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when "00000001" | "00010001" | "00000011" | "00010011" =>
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mnemonic_v := MN_SKMBZ;
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-- Mnemonic SKT ---------------------------------------------------------
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when "01000001" =>
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if not t41x_type_v then
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mnemonic_v := MN_SKT;
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end if;
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-- Mnemonic XAS ---------------------------------------------------------
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when "01001111" =>
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mnemonic_v := MN_XAS;
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-- Mnemonic EXT ---------------------------------------------------------
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when "00110011" =>
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mnemonic_v := MN_EXT;
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multi_byte_v := true;
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when others =>
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null;
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end case;
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result_v.mnemonic := mnemonic_v;
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result_v.multi_byte := multi_byte_v;
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return result_v;
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end;
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end t400_mnemonic_pack;
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-------------------------------------------------------------------------------
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-- File History:
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--
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-- $Log: not supported by cvs2svn $
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-------------------------------------------------------------------------------
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