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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// T6507LP IP Core ////
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//// ////
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//// This file is part of the T6507LP project ////
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//// http://www.opencores.org/cores/t6507lp/ ////
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//// ////
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//// Description ////
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//// T6507LP Package ////
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//// ////
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//// To Do: ////
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//// - Documentation ////
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//// - Check syntax & Compile ////
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//// ////
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//// Author(s): ////
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//// - Gabriel Oshiro Zardo, gabrieloshiro@gmail.com ////
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//// - Samuel Nascimento Pagliarini (creep), snpagliarini@gmail.com ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2001 Authors and OPENCORES.ORG ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// Processor Status Register ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// C - Carry Flag ////
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//// Z - Zero Flag ////
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//// I - Interrupt Disable ////
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//// D - Decimal Mode ////
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//// B - Break Command ////
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//// 1 - Constant One ////
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//// V - oVerflow Flag ////
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//// N - Negative Flag ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// ------------------------------------------------- ////
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//// | N | V | 1 | B | D | I | Z | C | ////
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//// ------------------------------------------------- ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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localparam C = 3'b000;
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localparam Z = 3'b001;
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localparam I = 3'b010;
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localparam D = 3'b011;
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localparam B = 3'b100;
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//localparam 1 = 3'b101;
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localparam V = 3'b110;
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localparam N = 3'b111;
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// All opcodes are listed in alphabetic order.
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// Addressing Modes ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// IMP - Implicit ////
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//// ACC - Accumulator ////
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//// IMM - Immediate ////
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//// ZPG - Zero Page ////
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//// ZPX - Zero Page,X ////
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//// ZPY - Zero Page,Y ////
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//// REL - Relative ////
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//// ABS - Absolute ////
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//// ABX - Absolute,X ////
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//// ABY - Absolute,Y ////
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//// IDX - (Indirect,X) ////
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//// IDY - (Indirect),Y ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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localparam IMP = 4'h0,
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ACC = 4'h1,
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IMM = 4'h2,
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ZPG = 4'h3,
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ZPX = 4'h4,
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ZPY = 4'h5,
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REL = 4'h6,
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ABS = 4'h7,
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ABX = 4'h8,
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ABY = 4'h9,
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IDX = 4'hA,
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IDY = 4'hB;
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//TODO: Document all opcodes
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// ADC - Add with Carry ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// A,Z,C,N = A+M+C ////
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//// ////
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//// This instruction adds the contents of a memory location to the ////
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//// accumulator together with the carry bit. If overflow occurs the ////
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//// carry bit is set, this enables multiple byte addition to be ////
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//// performed. ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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//// ////
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//// C - Not affected ////
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//// Z - Not affected ////
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//// I - Not affected ////
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//// D - Not affected ////
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//// B - Not affected ////
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//// V - Not affected ////
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//// N - Not affected ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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localparam ADC_IMM = 8'h69,
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ADC_ZPG = 8'h65,
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ADC_ZPX = 8'h75,
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ADC_ABS = 8'h6D,
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ADC_ABX = 8'h7D,
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ADC_ABY = 8'h79,
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ADC_IDX = 8'h61,
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ADC_IDY = 8'h71;
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localparam AND_IMM = 8'h29,
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AND_ZPG = 8'h25,
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AND_ZPX = 8'h35,
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AND_ABS = 8'h2D,
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AND_ABX = 8'h3D,
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AND_ABY = 8'h39,
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AND_IDX = 8'h21,
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AND_IDY = 8'h31;
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localparam ASL_ACC = 8'h0A,
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ASL_ZPG = 8'h06,
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ASL_ZPX = 8'h16,
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ASL_ABS = 8'h0E,
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ASL_ABX = 8'h1E;
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localparam BCC_REL = 8'h90;
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localparam BCS_REL = 8'hB0;
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localparam BEQ_REL = 8'hF0;
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localparam BIT_ZPG = 8'h24,
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BIT_ABS = 8'h2C;
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localparam BMI_REL = 8'h30;
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localparam BNE_REL = 8'hD0;
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localparam BPL_REL = 8'h10;
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localparam BRK_IMP = 8'h00;
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localparam BVC_REL = 8'h50;
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localparam BVS_REL = 8'h70;
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localparam CLC_IMP = 8'h18;
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localparam CLD_IMP = 8'hD8;
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localparam CLI_IMP = 8'h58;
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localparam CLV_IMP = 8'hB8;
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localparam CMP_IMM = 8'hC9,
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CMP_ZPG = 8'hC5,
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CMP_ZPX = 8'hD5,
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CMP_ABS = 8'hCD,
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CMP_ABX = 8'hDD,
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CMP_ABY = 8'hD9,
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CMP_IDX = 8'hC1,
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CMP_IDY = 8'hD1;
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localparam CPX_IMM = 8'hE0,
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CPX_ZPG = 8'hE4,
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CPX_ABS = 8'hEC;
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localparam CPY_IMM = 8'hC0,
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CPY_ZPG = 8'hC4,
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CPY_ABS = 8'hCC;
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localparam DEC_ZPG = 8'hC6,
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DEC_ZPX = 8'hD6,
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DEC_ABS = 8'hCE,
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DEC_ABX = 8'hDE;
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localparam DEX_IMP = 8'hCA;
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localparam DEY_IMP = 8'h88;
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localparam EOR_IMM = 8'h49,
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EOR_ZPG = 8'h45,
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EOR_ZPX = 8'h55,
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EOR_ABS = 8'h4D,
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EOR_ABX = 8'h5D,
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EOR_ABY = 8'h59,
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EOR_IDX = 8'h41,
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EOR_IDY = 8'h51;
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localparam INC_ZPG = 8'hE6,
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INC_ZPX = 8'hF6,
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INC_ABS = 8'hEE,
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INC_ABX = 8'hFE;
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localparam INX_IMP = 8'hE8;
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localparam INY_IMP = 8'hC8;
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localparam JMP_ABS = 8'h4C,
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JMP_IND = 8'h6C;
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localparam JSR_ABS = 8'h20;
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localparam LDA_IMM = 8'hA9,
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LDA_ZPG = 8'hA5,
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LDA_ZPX = 8'hB5,
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LDA_ABS = 8'hAD,
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LDA_ABX = 8'hBD,
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LDA_ABY = 8'hB9,
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LDA_IDX = 8'hA1,
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LDA_IDY = 8'hB1;
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localparam LDX_IMM = 8'hA2,
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LDX_ZPG = 8'hA6,
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LDX_ZPY = 8'hB6,
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LDX_ABS = 8'hAE,
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LDX_ABY = 8'hBE;
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localparam LDY_IMM = 8'hA0,
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LDY_ZPG = 8'hA4,
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LDY_ZPX = 8'hB4,
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LDY_ABS = 8'hAC,
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LDY_ABX = 8'hBC;
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| 264 |
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localparam LSR_ACC = 8'h4A,
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LSR_ZPG = 8'h46,
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LSR_ZPX = 8'h56,
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LSR_ABS = 8'h4E,
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LSR_ABX = 8'h5E;
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| 270 |
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localparam NOP_IMP = 8'hEA;
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| 272 |
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localparam ORA_IMM = 8'h09,
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ORA_ZPG = 8'h05,
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ORA_ZPX = 8'h15,
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ORA_ABS = 8'h0D,
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ORA_ABX = 8'h1D,
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ORA_ABY = 8'h19,
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ORA_IDX = 8'h01,
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ORA_IDY = 8'h11;
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| 281 |
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localparam PHA_IMP = 8'h48;
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| 282 |
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| 283 |
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localparam PHP_IMP = 8'h08;
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| 284 |
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| 285 |
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localparam PLA_IMP = 8'h68;
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| 286 |
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| 287 |
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localparam PLP_IMP = 8'h28;
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| 288 |
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| 289 |
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localparam ROL_ACC = 8'h2A,
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ROL_ZPG = 8'h26,
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| 291 |
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ROL_ZPX = 8'h36,
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| 292 |
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ROL_ABS = 8'h2E,
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| 293 |
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ROL_ABX = 8'h3E;
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| 294 |
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| 295 |
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localparam ROR_ACC = 8'h6A,
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| 296 |
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ROR_ZPG = 8'h66,
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| 297 |
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ROR_ZPX = 8'h76,
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| 298 |
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ROR_ABS = 8'h6E,
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| 299 |
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ROR_ABX = 8'h7E;
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| 300 |
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| 301 |
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localparam RTI_IMP = 8'h40;
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| 302 |
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| 303 |
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localparam RTS_IMP = 8'h60;
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| 304 |
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| 305 |
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localparam SBC_IMM = 8'hE9,
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| 306 |
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SBC_ZPG = 8'hE5,
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| 307 |
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SBC_ZPX = 8'hF5,
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| 308 |
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SBC_ABS = 8'hED,
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| 309 |
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SBC_ABX = 8'hFD,
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| 310 |
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SBC_ABY = 8'hF9,
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| 311 |
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SBC_IDX = 8'hE1,
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| 312 |
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SBC_IDY = 8'hF1;
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| 313 |
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| 314 |
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localparam SEC_IMP = 8'h38;
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| 315 |
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| 316 |
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localparam SED_IMP = 8'hF8;
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| 317 |
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| 318 |
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localparam SEI_IMP = 8'h78;
|
| 319 |
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| 320 |
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localparam STA_ZPG = 8'h85,
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| 321 |
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STA_ZPX = 8'h95,
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| 322 |
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STA_ABS = 8'h8D,
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| 323 |
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STA_ABX = 8'h9D,
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| 324 |
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STA_ABY = 8'h99,
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| 325 |
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STA_IDX = 8'h81,
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| 326 |
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STA_IDY = 8'h91;
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| 327 |
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| 328 |
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localparam STX_ZPG = 8'h86,
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| 329 |
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STX_ZPY = 8'h96,
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| 330 |
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STX_ABS = 8'h8E;
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| 331 |
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| 332 |
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localparam STY_ZPG = 8'h84,
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| 333 |
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STY_ZPX = 8'h94,
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| 334 |
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STY_ABS = 8'h8C;
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| 335 |
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| 336 |
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localparam TAX_IMP = 8'hAA;
|
| 337 |
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| 338 |
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localparam TAY_IMP = 8'hA8;
|
| 339 |
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| 340 |
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localparam TSX_IMP = 8'hBA;
|
| 341 |
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| 342 |
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localparam TXA_IMP = 8'h8A;
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| 343 |
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| 344 |
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localparam TXS_IMP = 8'h9A;
|
| 345 |
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| 346 |
|
|
localparam TYA_IMP = 8'h98;
|
| 347 |
|
|
|
| 348 |
|
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// DDT did a job on me...
|
