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/trunk/rtl/vhdl/t400_mnemonic_pack-p.vhd
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-------------------------------------------------------------------------------
--
-- $Id: t400_mnemonic_pack-p.vhd,v 1.1 2008-05-01 19:52:37 arniml Exp $
--
-- 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;
 
 
-------------------------------------------------------------------------------
-- File History:
--
-- $Log: not supported by cvs2svn $
-------------------------------------------------------------------------------

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