6502 implementation in SystemVerilog
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localparam ADDR_MODE_IMPLIED = 0;
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localparam ADDR_MODE_IMMEDIATE = 1;
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localparam ADDR_MODE_ABSOLUTE = 2;
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localparam ADDR_MODE_ZP = 3;
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localparam ADDR_MODE_INDEXED_ABSOLUTE = 4;
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localparam ADDR_MODE_INDEXED_ZP = 5;
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localparam ADDR_MODE_INDIRECT = 6;
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localparam ADDR_MODE_PREINDEXED_INDIRECT = 7;
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localparam ADDR_MODE_POSTINDEXED_INDIRECT = 8;
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localparam ADDR_MODE_RELATIVE = 9;
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localparam OP_OR = 0;
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localparam OP_AND = 1;
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localparam OP_EOR = 2;
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localparam OP_ADC = 3;
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localparam OP_SUB = 4;
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localparam OP_ROT = 5;
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localparam OP_SHF = 6;
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localparam SHIFT_LEFT = 0;
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localparam SHIFT_RIGHT = 1;
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localparam I_LDA = 0;
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localparam I_LDX = 1;
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localparam I_LDY = 2;
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localparam I_STA = 3;
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localparam I_STX = 4;
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localparam I_STY = 5;
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localparam I_TAX = 6;
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localparam I_TAY = 7;
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localparam I_TXA = 8;
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localparam I_TYA = 9;
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localparam I_TSX = 10;
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localparam I_TXS = 11;
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localparam I_PHA = 12;
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localparam I_PHP = 13;
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localparam I_PLA = 14;
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localparam I_PLP = 15;
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localparam I_AND = 16;
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localparam I_EOR = 17;
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localparam I_ORA = 18;
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localparam I_BIT = 19;
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localparam I_ADC = 20;
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localparam I_SBC = 21;
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localparam I_CMP = 22;
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localparam I_CPX = 23;
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localparam I_CPY = 24;
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localparam I_INC = 25;
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localparam I_INX = 26;
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localparam I_INY = 27;
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localparam I_DEC = 28;
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localparam I_DEX = 29;
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localparam I_DEY = 30;
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localparam I_ASL = 31;
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localparam I_LSR = 32;
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localparam I_ROL = 33;
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localparam I_ROR = 34;
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localparam I_JMP = 35;
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localparam I_JSR = 36;
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localparam I_RTS = 37;
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localparam I_BCC = 38;
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localparam I_BCS = 39;
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localparam I_BEQ = 40;
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localparam I_BMI = 41;
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localparam I_BNE = 42;
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localparam I_BPL = 43;
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localparam I_BVC = 44;
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localparam I_BVS = 45;
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localparam I_CLC = 46;
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localparam I_CLD = 47;
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localparam I_CLI = 48;
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localparam I_CLV = 49;
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localparam I_SEC = 50;
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localparam I_SED = 51;
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localparam I_SEI = 52;
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localparam I_BRK = 53;
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localparam I_NOP = 54;
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localparam I_RTI = 55;
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// Unofficial opcodes
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localparam I_STP = 56;
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localparam I_SHY = 57;
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localparam P_N = 7;
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localparam P_V = 6;
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localparam P_B = 5;
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localparam P_D = 3;
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localparam P_I = 2;
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localparam P_Z = 1;
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localparam P_C = 0;
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localparam DMUX_PC = 3'h0;
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localparam DMUX_A = 3'h1;
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localparam DMUX_X = 3'h2;
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localparam DMUX_Y = 3'h3;
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localparam DMUX_SP = 3'h4;
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localparam DMUX_AUX = 3'h5;
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