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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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--
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--
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-- The decoder unit.
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-- The decoder unit.
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-- Implements the instruction opcodes and controls all units of the T400 core.
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-- Implements the instruction opcodes and controls all units of the T400 core.
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--
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--
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-- $Id: t400_decoder.vhd,v 1.6 2006-06-05 14:20:34 arniml Exp $
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-- $Id: t400_decoder.vhd,v 1.7 2008-05-01 19:49:55 arniml Exp $
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--
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--
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-- Copyright (c) 2006 Arnim Laeuger (arniml@opencores.org)
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-- Copyright (c) 2006 Arnim Laeuger (arniml@opencores.org)
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--
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--
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-- All rights reserved
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-- All rights reserved
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--
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--
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library ieee;
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library ieee;
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use ieee.numeric_std.all;
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use ieee.numeric_std.all;
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use work.t400_comp_pack.t400_opc_table;
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use work.t400_mnemonic_pack.all;
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architecture rtl of t400_decoder is
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architecture rtl of t400_decoder is
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signal cyc_cnt_q : unsigned(2 downto 0);
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signal cyc_cnt_q : unsigned(2 downto 0);
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signal ibyte1_q,
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signal ibyte1_q,
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ibyte2_q : byte_t;
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ibyte2_q : byte_t;
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signal opcode_s : byte_t;
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signal opcode_s : byte_t;
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signal second_cyc_q : boolean;
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signal second_cyc_q : boolean;
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signal mnemonic_rec_s : mnemonic_rec_t;
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signal mnemonic_s,
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signal mnemonic_s,
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mnemonic_q : mnemonic_t;
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mnemonic_q : mnemonic_t;
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signal multi_byte_s,
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signal multi_byte_s,
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multi_byte_q : boolean;
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multi_byte_q : boolean;
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signal last_cycle_s : boolean;
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signal last_cycle_s : boolean;
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when icyc_en_i else
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when icyc_en_i else
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ibyte1_q;
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ibyte1_q;
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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-- Opcode decoder table
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-- Opcode decoder table
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--
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mnemonic_rec_s <= decode_opcode_f(opcode => opcode_s,
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opt_type => opt_type_g);
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--
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mnemonic_s <= mnemonic_rec_s.mnemonic;
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multi_byte_s <= mnemonic_rec_s.multi_byte;
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--
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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opc_table_b : t400_opc_table
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generic map (
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opt_type_g => opt_type_g
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)
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port map (
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opcode_i => opcode_s,
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mnemonic_o => mnemonic_s,
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multi_byte_o => multi_byte_s
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);
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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-- Process decoder_ctrl
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-- Process decoder_ctrl
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--
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--
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Line 860... |
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-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-- File History:
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-- File History:
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--
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--
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-- $Log: not supported by cvs2svn $
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-- $Log: not supported by cvs2svn $
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-- Revision 1.6 2006/06/05 14:20:34 arniml
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-- interface comments added
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--
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-- Revision 1.5 2006/05/28 15:32:14 arniml
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-- Revision 1.5 2006/05/28 15:32:14 arniml
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-- execute virtual NOP at location 0x0ff when vectoring to interrupt routine
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-- execute virtual NOP at location 0x0ff when vectoring to interrupt routine
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--
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--
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-- Revision 1.4 2006/05/27 19:14:18 arniml
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-- Revision 1.4 2006/05/27 19:14:18 arniml
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-- interrupt functionality added
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-- interrupt functionality added
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