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arniml |
-------------------------------------------------------------------------------
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--
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-- The Opcode Decoder Table.
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-- Decodes the given opcode to instruction mnemonics.
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-- Also derives the multicycle information.
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--
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-- $Id: opc_table.vhd,v 1.1 2004-03-23 21:31:52 arniml Exp $
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--
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-- All rights reserved
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--
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-- Redistribution and use in source and synthezised forms, with or without
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-- modification, are permitted provided that the following conditions are met:
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--
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-- Redistributions of source code must retain the above copyright notice,
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-- this list of conditions and the following disclaimer.
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--
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-- Redistributions in synthesized form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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-- Neither the name of the author nor the names of other contributors may
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-- be used to endorse or promote products derived from this software without
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-- specific prior written permission.
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--
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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-- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
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-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- POSSIBILITY OF SUCH DAMAGE.
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--
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-- Please report bugs to the author, but before you do so, please
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-- make sure that this is not a derivative work and that
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-- you have the latest version of this file.
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--
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-- The latest version of this file can be found at:
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-- http://www.opencores.org/cvsweb.shtml/t48/
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--
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-------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use work.t48_pack.word_t;
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use work.decoder_pack.mnemonic_t;
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entity opc_table is
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port (
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opcode_i : in word_t;
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multi_cycle_o : out std_logic;
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mnemonic_o : out mnemonic_t
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);
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end opc_table;
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use work.decoder_pack.all;
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architecture rtl of opc_table is
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begin
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-----------------------------------------------------------------------------
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-- Process opc_decode
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--
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-- Purpose:
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-- Decode the opcode to the set of mnemonics.
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--
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opc_decode: process (opcode_i)
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begin
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-- default assignment
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mnemonic_o <= MN_NOP;
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multi_cycle_o <= '0';
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case opcode_i is
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-- Mnemonic ADD ---------------------------------------------------------
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when "01101000" | "01101001" | "01101010" | "01101011" | -- ADD A, Rr
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"01101100" | "01101101" | "01101110" | "01101111" | --
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"01100000" | "01100001" | -- ADD A, @ Rr
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"01111000" | "01111001" | "01111010" | "01111011" | -- ADDC A, Rr
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"01111100" | "01111101" | "01111110" | "01111111" | --
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"01110000" | "01110001" => -- ADDC A, @ Rr
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mnemonic_o <= MN_ADD;
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-- Mnemonic ADD_A_DATA --------------------------------------------------
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when "00000011" | -- ADD A, data
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"00010011" => -- ADDC A, data
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mnemonic_o <= MN_ADD_A_DATA;
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multi_cycle_o <= '1';
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-- Mnemonic ANL ---------------------------------------------------------
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when "01011000" | "01011001" | "01011010" | "01011011" | -- ANL A, Rr
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"01011100" | "01011101" | "01011110" | "01011111" | --
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"01010000" | "01010001" => -- ANL A, @ Rr
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mnemonic_o <= MN_ANL;
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-- Mnemonic ANL_A_DATA --------------------------------------------------
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when "01010011" => -- ANL A, data
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mnemonic_o <= MN_ANL_A_DATA;
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multi_cycle_o <= '1';
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-- Mnemonic ANL_EXT -----------------------------------------------------
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when "10011000" | -- ANL BUS, data
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"10011001" | "10011010" => -- ANL PP, data
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mnemonic_o <= MN_ANL_EXT;
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multi_cycle_o <= '1';
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-- Mnemonic ANLD --------------------------------------------------------
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when "10011100" | "10011101" | "10011110" | "10011111" => -- ANLD PP, A
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mnemonic_o <= MN_ANLD;
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multi_cycle_o <= '1';
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-- Mnemonic CALL --------------------------------------------------------
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when "00010100" | "00110100" | "01010100" | "01110100" | -- CALL addr
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"10010100" | "10110100" | "11010100" | "11110100" => --
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mnemonic_o <= MN_CALL;
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multi_cycle_o <= '1';
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-- Mnemonic CLR_A -------------------------------------------------------
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when "00100111" => -- CLR A
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mnemonic_o <= MN_CLR_A;
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-- Mnemonic CLR_C -------------------------------------------------------
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when "10010111" => -- CLR C
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mnemonic_o <= MN_CLR_C;
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-- Mnemonic CLR_F -------------------------------------------------------
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when "10000101" | -- CLR F0
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"10100101" =>
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mnemonic_o <= MN_CLR_F;
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-- Mnemonic CPL_A -------------------------------------------------------
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when "00110111" => -- CPL A
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mnemonic_o <= MN_CPL_A;
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-- Mnemonic CPL_C -------------------------------------------------------
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when "10100111" => -- CPL C
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mnemonic_o <= MN_CPL_C;
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-- Mnemonic CPL_F -------------------------------------------------------
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when "10010101" | -- CPL F0
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"10110101" => -- CPL F1
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mnemonic_o <= MN_CPL_F;
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-- Mnemonic DA ----------------------------------------------------------
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when "01010111" => -- DA D
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mnemonic_o <= MN_DA;
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-- Mnemonic DEC ---------------------------------------------------------
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when "11001000" | "11001001" | "11001010" | "11001011" | -- DEC Rr
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"11001100" | "11001101" | "11001110" | "11001111" | --
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"00000111" => -- DEC A
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mnemonic_o <= MN_DEC;
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-- Mnemonic DIS_EN_I ----------------------------------------------------
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when "00010101" | -- DIS I
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"00000101" => -- EN I
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mnemonic_o <= MN_DIS_EN_I;
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-- Mnemonic DIS_EN_TCNTI ------------------------------------------------
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when "00110101" | -- DIS TCNTI
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"00100101" => -- EN TCNTI
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mnemonic_o <= MN_DIS_EN_TCNTI;
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-- Mnemonic DJNZ --------------------------------------------------------
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when "11101000" | "11101001" | "11101010" | "11101011" | -- DJNZ Rr, addr
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"11101100" | "11101101" | "11101110" | "11101111" => --
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mnemonic_o <= MN_DJNZ;
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multi_cycle_o <= '1';
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-- Mnemonic ENT0_CLK ----------------------------------------------------
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when "01110101" => -- ENT0 CLK
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mnemonic_o <= MN_ENT0_CLK;
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-- Mnemonic IN ----------------------------------------------------------
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when "00001001" | "00001010" => -- IN A, Pp
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mnemonic_o <= MN_IN;
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multi_cycle_o <= '1';
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-- Mnemonic INC ---------------------------------------------------------
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when "00010111" | -- INC A
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"00011000" | "00011001" | "00011010" | "00011011" | -- INC Rr
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"00011100" | "00011101" | "00011110" | "00011111" | --
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"00010000" | "00010001" => -- INC @ Rr
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mnemonic_o <= MN_INC;
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-- Mnemonic INS ---------------------------------------------------------
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when "00001000" => -- INS A, BUS
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mnemonic_o <= MN_INS;
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multi_cycle_o <= '1';
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-- Mnemonic JBB ---------------------------------------------------------
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when "00010010" | "00110010" | "01010010" | "01110010" | -- JBb addr
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"10010010" | "10110010" | "11010010" | "11110010" => --
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mnemonic_o <= MN_JBB;
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multi_cycle_o <= '1';
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-- Mnemonic JC ----------------------------------------------------------
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when "11110110" | -- JC addr
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"11100110" => -- JNC addr
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mnemonic_o <= MN_JC;
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multi_cycle_o <= '1';
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-- Mnemonic JF ----------------------------------------------------------
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when "10110110" | -- JF0 addr
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"01110110" => -- JF1 addr
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mnemonic_o <= MN_JF;
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multi_cycle_o <= '1';
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-- Mnemonic JMP ---------------------------------------------------------
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when "00000100" | "00100100" | "01000100" | "01100100" | -- JMP addr
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| 218 |
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"10000100" | "10100100" | "11000100" | "11100100" => --
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mnemonic_o <= MN_JMP;
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multi_cycle_o <= '1';
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-- Mnemonic JMPP --------------------------------------------------------
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when "10110011" => -- JMPP @ A
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mnemonic_o <= MN_JMPP;
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multi_cycle_o <= '1';
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-- Mnemonic JNI ---------------------------------------------------------
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when "10000110" => -- JNI addr
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mnemonic_o <= MN_JNI;
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multi_cycle_o <= '1';
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-- Mnemonic JT ----------------------------------------------------------
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when "00100110" | -- JNT0 addr
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"01000110" | -- JNT1 addr
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"00110110" | -- JT0 addr
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"01010110" => -- JT1 addr
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mnemonic_o <= MN_JT;
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multi_cycle_o <= '1';
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| 240 |
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-- Mnemonic JTF ---------------------------------------------------------
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when "00010110" => -- JTF addr
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mnemonic_o <= MN_JTF;
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multi_cycle_o <= '1';
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-- Mnemonic JZ ----------------------------------------------------------
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when "10010110" | -- JNZ addr
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"11000110" => -- JZ addr
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| 248 |
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mnemonic_o <= MN_JZ;
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multi_cycle_o <= '1';
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| 251 |
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-- Mnemonic MOV_A_DATA --------------------------------------------------
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| 252 |
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when "00100011" => -- MOV A, data
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| 253 |
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mnemonic_o <= MN_MOV_A_DATA;
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| 254 |
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multi_cycle_o <= '1';
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| 255 |
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| 256 |
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-- Mnemonic MOV_A_PSW ---------------------------------------------------
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| 257 |
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when "11000111" => -- MOV A, PSW
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| 258 |
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mnemonic_o <= MN_MOV_A_PSW;
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| 259 |
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| 260 |
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-- Mnemonic MOV_A_RR ----------------------------------------------------
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| 261 |
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when "11111000" | "11111001" | "11111010" | "11111011" | -- MOV A, Rr
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| 262 |
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"11111100" | "11111101" | "11111110" | "11111111" | --
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| 263 |
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"11110000" | "11110001" => -- MOV A, @ Rr
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| 264 |
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mnemonic_o <= MN_MOV_A_RR;
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| 265 |
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| 266 |
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-- Mnemonic MOV_PSW_A ---------------------------------------------------
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| 267 |
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when "11010111" => -- MOV PSW, A
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| 268 |
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mnemonic_o <= MN_MOV_PSW_A;
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| 269 |
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| 270 |
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-- Mnemonic MOV_RR ------------------------------------------------------
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| 271 |
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when "10101000" | "10101001" | "10101010" | "10101011" | -- MOV Rr, A
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| 272 |
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"10101100" | "10101101" | "10101110" | "10101111" | --
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| 273 |
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"10100000" | "10100001" => -- MOV @ Rr, A
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| 274 |
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mnemonic_o <= MN_MOV_RR;
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| 275 |
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| 276 |
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-- Mnemonic MOV_RR_DATA -------------------------------------------------
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| 277 |
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when "10111000" | "10111001" | "10111010" | "10111011" | -- MOV Rr, data
|
| 278 |
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"10111100" | "10111101" | "10111110" | "10111111" | --
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| 279 |
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"10110000" | "10110001" => -- MOV @ Rr, data
|
| 280 |
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mnemonic_o <= MN_MOV_RR_DATA;
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| 281 |
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multi_cycle_o <= '1';
|
| 282 |
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|
| 283 |
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-- Mnemonic MOV_T -------------------------------------------------------
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| 284 |
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when "01100010" | -- MOV T, A
|
| 285 |
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"01000010" => -- MOV A, T
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| 286 |
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mnemonic_o <= MN_MOV_T;
|
| 287 |
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|
|
| 288 |
|
|
-- Mnemonic MOV_A_PP ----------------------------------------------------
|
| 289 |
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when "00001100" | "00001101" | "00001110" | "00001111" => -- MOV A, Pp
|
| 290 |
|
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mnemonic_o <= MN_MOV_A_PP;
|
| 291 |
|
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multi_cycle_o <= '1';
|
| 292 |
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|
| 293 |
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-- Mnemonic MOV_PP_A ----------------------------------------------------
|
| 294 |
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when "00111100" | "00111101" | "00111110" | "00111111" => -- MOV Pp, A
|
| 295 |
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mnemonic_o <= MN_MOV_PP_A;
|
| 296 |
|
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multi_cycle_o <= '1';
|
| 297 |
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|
| 298 |
|
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-- Mnemonic MOVP --------------------------------------------------------
|
| 299 |
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when "10100011" | -- MOVP A, @ A
|
| 300 |
|
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"11100011" => -- MOVP3 A, @ A
|
| 301 |
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mnemonic_o <= MN_MOVP;
|
| 302 |
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multi_cycle_o <= '1';
|
| 303 |
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|
| 304 |
|
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-- Mnemonic MOVX --------------------------------------------------------
|
| 305 |
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when "10000000" | "10000001" | -- MOVX A, @ Rr
|
| 306 |
|
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"10010000" | "10010001" => -- MOVX @ Rr, A
|
| 307 |
|
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mnemonic_o <= MN_MOVX;
|
| 308 |
|
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multi_cycle_o <= '1';
|
| 309 |
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|
|
| 310 |
|
|
-- Mnemonic NOP ---------------------------------------------------------
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| 311 |
|
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when "00000000" => -- NOP
|
| 312 |
|
|
mnemonic_o <= MN_NOP;
|
| 313 |
|
|
|
| 314 |
|
|
-- Mnemonic ORL ---------------------------------------------------------
|
| 315 |
|
|
when "01001000" | "01001001" | "01001010" | "01001011" | -- ORL A, Rr
|
| 316 |
|
|
"01001100" | "01001101" | "01001110" | "01001111" | --
|
| 317 |
|
|
"01000000" | "01000001" => -- ORL A, @ Rr
|
| 318 |
|
|
mnemonic_o <= MN_ORL;
|
| 319 |
|
|
|
| 320 |
|
|
-- Mnemonic ORL_A_DATA --------------------------------------------------
|
| 321 |
|
|
when "01000011" => -- ORL A, data
|
| 322 |
|
|
mnemonic_o <= MN_ORL_A_DATA;
|
| 323 |
|
|
multi_cycle_o <= '1';
|
| 324 |
|
|
|
| 325 |
|
|
-- Mnemonic ORL_EXT -----------------------------------------------------
|
| 326 |
|
|
when "10001000" | -- ORL BUS, data
|
| 327 |
|
|
"10001001" | "10001010" => -- ORL Pp, data
|
| 328 |
|
|
mnemonic_o <= MN_ORL_EXT;
|
| 329 |
|
|
multi_cycle_o <= '1';
|
| 330 |
|
|
|
| 331 |
|
|
-- Mnemonic ORLD_PP_A ----------------------------------------------------
|
| 332 |
|
|
when "10001100" | "10001101" | "10001110" | "10001111" => -- ORLD Pp, A
|
| 333 |
|
|
mnemonic_o <= MN_ORLD_PP_A;
|
| 334 |
|
|
multi_cycle_o <= '1';
|
| 335 |
|
|
|
| 336 |
|
|
-- Mnemonic OUTL_EXT ----------------------------------------------------
|
| 337 |
|
|
when "00111001" | "00111010" | -- OUTL Pp, A
|
| 338 |
|
|
"00000010" => -- OUTL BUS, A
|
| 339 |
|
|
mnemonic_o <= MN_OUTL_EXT;
|
| 340 |
|
|
multi_cycle_o <= '1';
|
| 341 |
|
|
|
| 342 |
|
|
-- Mnemonic RET ---------------------------------------------------------
|
| 343 |
|
|
when "10000011" | -- RET
|
| 344 |
|
|
"10010011" => -- RETR
|
| 345 |
|
|
mnemonic_o <= MN_RET;
|
| 346 |
|
|
multi_cycle_o <= '1';
|
| 347 |
|
|
|
| 348 |
|
|
-- Mnemonic RL ----------------------------------------------------------
|
| 349 |
|
|
when "11100111" | -- RL A
|
| 350 |
|
|
"11110111" => -- RLC A
|
| 351 |
|
|
mnemonic_o <= MN_RL;
|
| 352 |
|
|
|
| 353 |
|
|
-- Mnemonic RR ----------------------------------------------------------
|
| 354 |
|
|
when "01110111" | -- RR A
|
| 355 |
|
|
"01100111" => -- RRC A
|
| 356 |
|
|
mnemonic_o <= MN_RR;
|
| 357 |
|
|
|
| 358 |
|
|
-- Mnemonic SEL_MB ------------------------------------------------------
|
| 359 |
|
|
when "11100101" | -- SEL MB0
|
| 360 |
|
|
"11110101" => -- SEL MB1
|
| 361 |
|
|
mnemonic_o <= MN_SEL_MB;
|
| 362 |
|
|
|
| 363 |
|
|
-- Mnemonic SEL_RB ------------------------------------------------------
|
| 364 |
|
|
when "11000101" | -- SEL RB0
|
| 365 |
|
|
"11010101" => -- SEL RB1
|
| 366 |
|
|
mnemonic_o <= MN_SEL_RB;
|
| 367 |
|
|
|
| 368 |
|
|
-- Mnemonic STOP_TCNT ---------------------------------------------------
|
| 369 |
|
|
when "01100101" => -- STOP TCNT
|
| 370 |
|
|
mnemonic_o <= MN_STOP_TCNT;
|
| 371 |
|
|
|
| 372 |
|
|
-- Mnemonic START -------------------------------------------------------
|
| 373 |
|
|
when "01000101" | -- STRT CNT
|
| 374 |
|
|
"01010101" => -- STRT T
|
| 375 |
|
|
mnemonic_o <= MN_STRT;
|
| 376 |
|
|
|
| 377 |
|
|
-- Mnemonic SWAP --------------------------------------------------------
|
| 378 |
|
|
when "01000111" => -- SWAP A
|
| 379 |
|
|
mnemonic_o <= MN_SWAP;
|
| 380 |
|
|
|
| 381 |
|
|
-- Mnemonic XCH ---------------------------------------------------------
|
| 382 |
|
|
when "00101000" | "00101001" | "00101010" | "00101011" | -- XCH A, Rr
|
| 383 |
|
|
"00101100" | "00101101" | "00101110" | "00101111" | --
|
| 384 |
|
|
"00100000" | "00100001" | -- XCH A, @ Rr
|
| 385 |
|
|
"00110000" | "00110001" => -- XCHD A, @ Rr
|
| 386 |
|
|
mnemonic_o <= MN_XCH;
|
| 387 |
|
|
|
| 388 |
|
|
-- Mnemonic XRL ---------------------------------------------------------
|
| 389 |
|
|
when "11011000" | "11011001" | "11011010" | "11011011" | -- XRL A, Rr
|
| 390 |
|
|
"11011100" | "11011101" | "11011110" | "11011111" | --
|
| 391 |
|
|
"11010000" | "11010001" => -- XRL A, @ Rr
|
| 392 |
|
|
mnemonic_o <= MN_XRL;
|
| 393 |
|
|
|
| 394 |
|
|
-- Mnemonic XRL_A_DATA --------------------------------------------------
|
| 395 |
|
|
when "11010011" => -- XRL A, data
|
| 396 |
|
|
mnemonic_o <= MN_XRL_A_DATA;
|
| 397 |
|
|
multi_cycle_o <= '1';
|
| 398 |
|
|
|
| 399 |
|
|
when others =>
|
| 400 |
|
|
-- pragma translate_off
|
| 401 |
|
|
assert now = 0 ns
|
| 402 |
|
|
report "Unknown opcode."
|
| 403 |
|
|
severity warning;
|
| 404 |
|
|
-- pragma translate_on
|
| 405 |
|
|
|
| 406 |
|
|
end case;
|
| 407 |
|
|
|
| 408 |
|
|
end process opc_decode;
|
| 409 |
|
|
--
|
| 410 |
|
|
-----------------------------------------------------------------------------
|
| 411 |
|
|
|
| 412 |
|
|
end rtl;
|
| 413 |
|
|
|
| 414 |
|
|
|
| 415 |
|
|
-------------------------------------------------------------------------------
|
| 416 |
|
|
-- File History:
|
| 417 |
|
|
--
|
| 418 |
|
|
-- $Log: not supported by cvs2svn $
|
| 419 |
|
|
--
|
| 420 |
|
|
-------------------------------------------------------------------------------
|
