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sequencer.vhd
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sequencer.vhd
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/*
This file is part of fpgaNES.
fpgaNES is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
fpgaNES is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with fpgaNES. If not, see <http://www.gnu.org/licenses/>.
*/
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.numeric_std.all;
use work.common.all;
entity sequencer is
port
(
i_opcode : in std_logic_vector(7 downto 0);
i_cycle : in std_logic_vector(2 downto 0);
o_ctrl_op : out ctrl_op_t;
o_pc_op : out pc_op_t;
o_in_op : out in_op_t;
o_out_op : out out_op_t;
o_reg_op : out reg_op_t;
o_flags_op : out flags_op_t;
o_alu_op : out alu_op_t;
o_addr_op : out addr_op_t;
o_alu_a_op : out alu_inp_t;
o_alu_b_op : out alu_inp_t;
o_branch_at_cycle_1 : out boolean;
o_branch_at_cycle_2 : out boolean
);
end sequencer;
architecture behavioral of sequencer is
signal s_addr : std_ulogic_vector(10 downto 0);
begin
-- Controller
with s_addr select o_ctrl_op <=
don when b"0110_1001_001", -- ADC / Immediate
don when b"0110_0101_010", -- ADC / Zero Page
don when b"0111_0101_011", -- ADC / Zero Page,X
don when b"0110_1101_011", -- ADC / Absolute
alc when b"0111_1101_010", -- ADC / Absolute,X
don when b"0111_1101_100", -- ADC / Absolute,X
alc when b"0111_1001_010", -- ADC / Absolute,Y
don when b"0111_1001_100", -- ADC / Absolute,Y
don when b"0110_0001_101", -- ADC / (Indirect,X)
alc when b"0111_0001_011", -- ADC / (Indirect),Y
don when b"0111_0001_101", -- ADC / (Indirect),Y
don when b"0010_1001_001", -- AND / Immediate
don when b"0010_0101_010", -- AND / Zero Page
don when b"0011_0101_011", -- AND / Zero Page,X
don when b"0010_1101_011", -- AND / Absolute
alc when b"0011_1101_010", -- AND / Absolute,X
don when b"0011_1101_100", -- AND / Absolute,X
alc when b"0011_1001_010", -- AND / Absolute,Y
don when b"0011_1001_100", -- AND / Absolute,Y
don when b"0010_0001_101", -- AND / (Indirect,X)
alc when b"0011_0001_011", -- AND / (Indirect),Y
don when b"0011_0001_101", -- AND / (Indirect),Y
don when b"0000_1010_001", -- ASL / Accumulator
don when b"0000_0110_100", -- ASL / Zero Page
don when b"0001_0110_101", -- ASL / Zero Page,X
don when b"0000_1110_101", -- ASL / Absolute
don when b"0001_1110_110", -- ASL / Absolute,X
bcc when b"1001_0000_001", -- BCC / Relative
don when b"1001_0000_011", -- BCC / Relative
bcs when b"1011_0000_001", -- BCS / Relative
don when b"1011_0000_011", -- BCS / Relative
beq when b"1111_0000_001", -- BEQ / Relative
don when b"1111_0000_011", -- BEQ / Relative
don when b"0010_0100_010", -- BIT / Zero Page
don when b"0010_1100_011", -- BIT / Absolute
bmi when b"0011_0000_001", -- BMI / Relative
don when b"0011_0000_011", -- BMI / Relative
bne when b"1101_0000_001", -- BNE / Relative
don when b"1101_0000_011", -- BNE / Relative
bpl when b"0001_0000_001", -- BPL / Relative
don when b"0001_0000_011", -- BPL / Relative
don when b"0000_0000_110", -- BRK / Implied
bvc when b"0101_0000_001", -- BVC / Relative
don when b"0101_0000_011", -- BVC / Relative
bvs when b"0111_0000_001", -- BVS / Relative
don when b"0111_0000_011", -- BVS / Relative
don when b"0001_1000_001", -- CLC / Implied
don when b"1101_1000_001", -- CLD / Implied
don when b"0101_1000_001", -- CLI / Implied
don when b"1011_1000_001", -- CLV / Implied
don when b"1100_1001_001", -- CMP / Immediate
don when b"1100_0101_010", -- CMP / Zero Page
don when b"1101_0101_011", -- CMP / Zero Page,X
don when b"1100_1101_011", -- CMP / Absolute
alc when b"1101_1101_010", -- CMP / Absolute,X
don when b"1101_1101_100", -- CMP / Absolute,X
alc when b"1101_1001_010", -- CMP / Absolute,Y
don when b"1101_1001_100", -- CMP / Absolute,Y
don when b"1100_0001_101", -- CMP / (Indirect,X)
alc when b"1101_0001_011", -- CMP / (Indirect),Y
don when b"1101_0001_101", -- CMP / (Indirect),Y
don when b"1110_0000_001", -- CPX / Immediate
don when b"1110_0100_010", -- CPX / Zero Page
don when b"1110_1100_011", -- CPX / Absolute
don when b"1100_0000_001", -- CPY / Immediate
don when b"1100_0100_010", -- CPY / Zero Page
don when b"1100_1100_011", -- CPY / Absolute
don when b"1100_0110_100", -- DEC / Zero Page
don when b"1101_0110_101", -- DEC / Zero Page,X
don when b"1100_1110_101", -- DEC / Absolute
don when b"1101_1110_110", -- DEC / Absolute,X
don when b"1100_1010_001", -- DEX / Implied
don when b"1000_1000_001", -- DEY / Implied
don when b"0100_1001_001", -- EOR / Immediate
don when b"0100_0101_010", -- EOR / Zero Page
don when b"0101_0101_011", -- EOR / Zero Page,X
don when b"0100_1101_011", -- EOR / Absolute
alc when b"0101_1101_010", -- EOR / Absolute,X
don when b"0101_1101_100", -- EOR / Absolute,X
alc when b"0101_1001_010", -- EOR / Absolute,Y
don when b"0101_1001_100", -- EOR / Absolute,Y
don when b"0100_0001_101", -- EOR / (Indirect,X)
alc when b"0101_0001_011", -- EOR / (Indirect),Y
don when b"0101_0001_101", -- EOR / (Indirect),Y
don when b"1110_0110_100", -- INC / Zero Page
don when b"1111_0110_101", -- INC / Zero Page,X
don when b"1110_1110_101", -- INC / Absolute
don when b"1111_1110_110", -- INC / Absolute,X
don when b"0000_0011_110", -- INT / Implied
don when b"1110_1000_001", -- INX / Implied
don when b"1100_1000_001", -- INY / Implied
don when b"0100_1100_010", -- JMP / Absolute
don when b"0110_1100_100", -- JMP / Indirect
don when b"0010_0000_101", -- JSR / Absolute
don when b"1010_1001_001", -- LDA / Immediate
don when b"1010_0101_010", -- LDA / Zero Page
don when b"1011_0101_011", -- LDA / Zero Page,X
don when b"1010_1101_011", -- LDA / Absolute
alc when b"1011_1101_010", -- LDA / Absolute,X
don when b"1011_1101_100", -- LDA / Absolute,X
alc when b"1011_1001_010", -- LDA / Absolute,Y
don when b"1011_1001_100", -- LDA / Absolute,Y
don when b"1010_0001_101", -- LDA / (Indirect,X)
alc when b"1011_0001_011", -- LDA / (Indirect),Y
don when b"1011_0001_101", -- LDA / (Indirect),Y
don when b"1010_0010_001", -- LDX / Immediate
don when b"1010_0110_010", -- LDX / Zero Page
don when b"1011_0110_011", -- LDX / Zero Page,Y
don when b"1010_1110_011", -- LDX / Absolute
alc when b"1011_1110_010", -- LDX / Absolute,Y
don when b"1011_1110_100", -- LDX / Absolute,Y
don when b"1010_0000_001", -- LDY / Immediate
don when b"1010_0100_010", -- LDY / Zero Page
don when b"1011_0100_011", -- LDY / Zero Page,X
don when b"1010_1100_011", -- LDY / Absolute
alc when b"1011_1100_010", -- LDY / Absolute,X
don when b"1011_1100_100", -- LDY / Absolute,X
don when b"0100_1010_001", -- LSR / Accumulator
don when b"0100_0110_100", -- LSR / Zero Page
don when b"0101_0110_101", -- LSR / Zero Page,X
don when b"0100_1110_101", -- LSR / Absolute
don when b"0101_1110_110", -- LSR / Absolute,X
don when b"0000_0100_110", -- NMI / Implied
don when b"1110_1010_001", -- NOP / Implied
don when b"0000_1001_001", -- ORA / Immediate
don when b"0000_0101_010", -- ORA / Zero Page
don when b"0001_0101_011", -- ORA / Zero Page,X
don when b"0000_1101_011", -- ORA / Absolute
alc when b"0001_1101_010", -- ORA / Absolute,X
don when b"0001_1101_100", -- ORA / Absolute,X
alc when b"0001_1001_010", -- ORA / Absolute,Y
don when b"0001_1001_100", -- ORA / Absolute,Y
don when b"0000_0001_101", -- ORA / (Indirect,X)
alc when b"0001_0001_011", -- ORA / (Indirect),Y
don when b"0001_0001_101", -- ORA / (Indirect),Y
don when b"0100_1000_010", -- PHA / Implied
don when b"0000_1000_010", -- PHP / Implied
don when b"0110_1000_011", -- PLA / Implied
don when b"0010_1000_011", -- PLP / Implied
don when b"0010_1010_001", -- ROL / Accumulator
don when b"0010_0110_100", -- ROL / Zero Page
don when b"0011_0110_101", -- ROL / Zero Page,X
don when b"0010_1110_101", -- ROL / Absolute
don when b"0011_1110_110", -- ROL / Absolute,X
don when b"0110_1010_001", -- ROR / Accumulator
don when b"0110_0110_100", -- ROR / Zero Page
don when b"0111_0110_101", -- ROR / Zero Page,X
don when b"0110_1110_101", -- ROR / Absolute
don when b"0111_1110_110", -- ROR / Absolute,X
don when b"0000_0010_011", -- RST / Implied
don when b"0100_0000_101", -- RTI / Implied
don when b"0110_0000_101", -- RTS / Implied
don when b"1110_1001_001", -- SBC / Immediate
don when b"1110_0101_010", -- SBC / Zero Page
don when b"1111_0101_011", -- SBC / Zero Page,X
don when b"1110_1101_011", -- SBC / Absolute
alc when b"1111_1101_010", -- SBC / Absolute,X
don when b"1111_1101_100", -- SBC / Absolute,X
alc when b"1111_1001_010", -- SBC / Absolute,Y
don when b"1111_1001_100", -- SBC / Absolute,Y
don when b"1110_0001_101", -- SBC / (Indirect,X)
alc when b"1111_0001_011", -- SBC / (Indirect),Y
don when b"1111_0001_101", -- SBC / (Indirect),Y
don when b"0011_1000_001", -- SEC / Implied
don when b"1111_1000_001", -- SED / Implied
don when b"0111_1000_001", -- SEI / Implied
don when b"1000_0101_010", -- STA / Zero Page
don when b"1001_0101_011", -- STA / Zero Page,X
don when b"1000_1101_011", -- STA / Absolute
don when b"1001_1101_100", -- STA / Absolute,X
don when b"1001_1001_100", -- STA / Absolute,Y
don when b"1000_0001_101", -- STA / (Indirect,X)
don when b"1001_0001_101", -- STA / (Indirect),Y
don when b"1000_0110_010", -- STX / Zero Page
don when b"1001_0110_011", -- STX / Zero Page,Y
don when b"1000_1110_011", -- STX / Absolute
don when b"1000_0100_010", -- STY / Zero Page
don when b"1001_0100_011", -- STY / Zero Page,X
don when b"1000_1100_011", -- STY / Absolute
don when b"1010_1010_001", -- TAX / Implied
don when b"1010_1000_001", -- TAY / Implied
don when b"1011_1010_001", -- TSX / Implied
don when b"1000_1010_001", -- TXA / Implied
don when b"1001_1010_001", -- TXS / Implied
don when b"1001_1000_001", -- TYA / Implied
nop when others;
-- Program-Counter
with s_addr select o_pc_op <=
inc when b"0110_1001_000", -- ADC / Immediate
inc when b"0110_0101_000", -- ADC / Zero Page
inc when b"0111_0101_000", -- ADC / Zero Page,X
inc when b"0110_1101_000", -- ADC / Absolute
inc when b"0110_1101_001", -- ADC / Absolute
inc when b"0111_1101_000", -- ADC / Absolute,X
inc when b"0111_1101_001", -- ADC / Absolute,X
inc when b"0111_1001_000", -- ADC / Absolute,Y
inc when b"0111_1001_001", -- ADC / Absolute,Y
inc when b"0110_0001_000", -- ADC / (Indirect,X)
inc when b"0111_0001_000", -- ADC / (Indirect),Y
inc when b"0010_1001_000", -- AND / Immediate
inc when b"0010_0101_000", -- AND / Zero Page
inc when b"0011_0101_000", -- AND / Zero Page,X
inc when b"0010_1101_000", -- AND / Absolute
inc when b"0010_1101_001", -- AND / Absolute
inc when b"0011_1101_000", -- AND / Absolute,X
inc when b"0011_1101_001", -- AND / Absolute,X
inc when b"0011_1001_000", -- AND / Absolute,Y
inc when b"0011_1001_001", -- AND / Absolute,Y
inc when b"0010_0001_000", -- AND / (Indirect,X)
inc when b"0011_0001_000", -- AND / (Indirect),Y
inc when b"0000_0110_000", -- ASL / Zero Page
inc when b"0001_0110_000", -- ASL / Zero Page,X
inc when b"0000_1110_000", -- ASL / Absolute
inc when b"0000_1110_001", -- ASL / Absolute
inc when b"0001_1110_000", -- ASL / Absolute,X
inc when b"0001_1110_001", -- ASL / Absolute,X
inc when b"1001_0000_000", -- BCC / Relative
pla when b"1001_0000_001", -- BCC / Relative
pha when b"1001_0000_010", -- BCC / Relative
inc when b"1011_0000_000", -- BCS / Relative
pla when b"1011_0000_001", -- BCS / Relative
pha when b"1011_0000_010", -- BCS / Relative
inc when b"1111_0000_000", -- BEQ / Relative
pla when b"1111_0000_001", -- BEQ / Relative
pha when b"1111_0000_010", -- BEQ / Relative
inc when b"0010_0100_000", -- BIT / Zero Page
inc when b"0010_1100_000", -- BIT / Absolute
inc when b"0010_1100_001", -- BIT / Absolute
inc when b"0011_0000_000", -- BMI / Relative
pla when b"0011_0000_001", -- BMI / Relative
pha when b"0011_0000_010", -- BMI / Relative
inc when b"1101_0000_000", -- BNE / Relative
pla when b"1101_0000_001", -- BNE / Relative
pha when b"1101_0000_010", -- BNE / Relative
inc when b"0001_0000_000", -- BPL / Relative
pla when b"0001_0000_001", -- BPL / Relative
pha when b"0001_0000_010", -- BPL / Relative
enb when b"0000_0000_000", -- BRK / Implied
daq when b"0000_0000_110", -- BRK / Implied
inc when b"0101_0000_000", -- BVC / Relative
pla when b"0101_0000_001", -- BVC / Relative
pha when b"0101_0000_010", -- BVC / Relative
inc when b"0111_0000_000", -- BVS / Relative
pla when b"0111_0000_001", -- BVS / Relative
pha when b"0111_0000_010", -- BVS / Relative
inc when b"1100_1001_000", -- CMP / Immediate
inc when b"1100_0101_000", -- CMP / Zero Page
inc when b"1101_0101_000", -- CMP / Zero Page,X
inc when b"1100_1101_000", -- CMP / Absolute
inc when b"1100_1101_001", -- CMP / Absolute
inc when b"1101_1101_000", -- CMP / Absolute,X
inc when b"1101_1101_001", -- CMP / Absolute,X
inc when b"1101_1001_000", -- CMP / Absolute,Y
inc when b"1101_1001_001", -- CMP / Absolute,Y
inc when b"1100_0001_000", -- CMP / (Indirect,X)
inc when b"1101_0001_000", -- CMP / (Indirect),Y
inc when b"1110_0000_000", -- CPX / Immediate
inc when b"1110_0100_000", -- CPX / Zero Page
inc when b"1110_1100_000", -- CPX / Absolute
inc when b"1110_1100_001", -- CPX / Absolute
inc when b"1100_0000_000", -- CPY / Immediate
inc when b"1100_0100_000", -- CPX / Zero Page
inc when b"1100_1100_000", -- CPX / Absolute
inc when b"1100_1100_001", -- CPX / Absolute
inc when b"1100_0110_000", -- DEC / Zero Page
inc when b"1101_0110_000", -- DEC / Zero Page,X
inc when b"1100_1110_000", -- DEC / Absolute
inc when b"1100_1110_001", -- DEC / Absolute
inc when b"1101_1110_000", -- DEC / Absolute,X
inc when b"1101_1110_001", -- DEC / Absolute,X
inc when b"0100_1001_000", -- EOR / Immediate
inc when b"0100_0101_000", -- EOR / Zero Page
inc when b"0101_0101_000", -- EOR / Zero Page,X
inc when b"0100_1101_000", -- EOR / Absolute
inc when b"0100_1101_001", -- EOR / Absolute
inc when b"0101_1101_000", -- EOR / Absolute,X
inc when b"0101_1101_001", -- EOR / Absolute,X
inc when b"0101_1001_000", -- EOR / Absolute,Y
inc when b"0101_1001_001", -- EOR / Absolute,Y
inc when b"0100_0001_000", -- EOR / (Indirect,X)
inc when b"0101_0001_000", -- EOR / (Indirect),Y
inc when b"1110_0110_000", -- INC / Zero Page
inc when b"1111_0110_000", -- INC / Zero Page,X
inc when b"1110_1110_000", -- INC / Absolute
inc when b"1110_1110_001", -- INC / Absolute
inc when b"1111_1110_000", -- INC / Absolute,X
inc when b"1111_1110_001", -- INC / Absolute,X
daq when b"0000_0011_110", -- INT / Implied
inc when b"0100_1100_000", -- JMP / Absolute
inc when b"0100_1100_001", -- JMP / Absolute
daq when b"0100_1100_010", -- JMP / Absolute
inc when b"0110_1100_000", -- JMP / Indirect
inc when b"0110_1100_001", -- JMP / Indirect
daq when b"0110_1100_100", -- JMP / Indirect
inc when b"0010_0000_000", -- JSR / Absolute
daq when b"0010_0000_101", -- JSR / Absolute
inc when b"1010_1001_000", -- LDA / Immediate
inc when b"1010_0101_000", -- LDA / Zero Page
inc when b"1011_0101_000", -- LDA / Zero Page,X
inc when b"1010_1101_000", -- LDA / Absolute
inc when b"1010_1101_001", -- LDA / Absolute
inc when b"1011_1101_000", -- LDA / Absolute,X
inc when b"1011_1101_001", -- LDA / Absolute,X
inc when b"1011_1001_000", -- LDA / Absolute,Y
inc when b"1011_1001_001", -- LDA / Absolute,Y
inc when b"1010_0001_000", -- LDA / (Indirect,X)
inc when b"1011_0001_000", -- LDA / (Indirect),Y
inc when b"1010_0010_000", -- LDX / Immediate
inc when b"1010_0110_000", -- LDX / Zero Page
inc when b"1011_0110_000", -- LDX / Zero Page,Y
inc when b"1010_1110_000", -- LDX / Absolute
inc when b"1010_1110_001", -- LDX / Absolute
inc when b"1011_1110_000", -- LDX / Absolute,Y
inc when b"1011_1110_001", -- LDX / Absolute,Y
inc when b"1010_0000_000", -- LDY / Immediate
inc when b"1010_0100_000", -- LDY / Zero Page
inc when b"1011_0100_000", -- LDY / Zero Page,X
inc when b"1010_1100_000", -- LDY / Absolute
inc when b"1010_1100_001", -- LDY / Absolute
inc when b"1011_1100_000", -- LDY / Absolute,X
inc when b"1011_1100_001", -- LDY / Absolute,X
inc when b"0100_0110_000", -- LSR / Zero Page
inc when b"0101_0110_000", -- LSR / Zero Page,X
inc when b"0100_1110_000", -- LSR / Absolute
inc when b"0100_1110_001", -- LSR / Absolute
inc when b"0101_1110_000", -- LSR / Absolute,X
inc when b"0101_1110_001", -- LSR / Absolute,X
daq when b"0000_0100_110", -- NMI / Implied
inc when b"0000_1001_000", -- ORA / Immediate
inc when b"0000_0101_000", -- ORA / Zero Page
inc when b"0001_0101_000", -- ORA / Zero Page,X
inc when b"0000_1101_000", -- ORA / Absolute
inc when b"0000_1101_001", -- ORA / Absolute
inc when b"0001_1101_000", -- ORA / Absolute,X
inc when b"0001_1101_001", -- ORA / Absolute,X
inc when b"0001_1001_000", -- ORA / Absolute,Y
inc when b"0001_1001_001", -- ORA / Absolute,Y
inc when b"0000_0001_000", -- ORA / (Indirect,X)
inc when b"0001_0001_000", -- ORA / (Indirect),Y
inc when b"0010_0110_000", -- ROL / Zero Page
inc when b"0011_0110_000", -- ROL / Zero Page,X
inc when b"0010_1110_000", -- ROL / Absolute
inc when b"0010_1110_001", -- ROL / Absolute
inc when b"0011_1110_000", -- ROL / Absolute,X
inc when b"0011_1110_001", -- ROL / Absolute,X
inc when b"0110_0110_000", -- ROR / Zero Page
inc when b"0111_0110_000", -- ROR / Zero Page,X
inc when b"0110_1110_000", -- ROR / Absolute
inc when b"0110_1110_001", -- ROR / Absolute
inc when b"0111_1110_000", -- ROR / Absolute,X
inc when b"0111_1110_001", -- ROR / Absolute,X
daq when b"0000_0010_011", -- RST / Implied
daq when b"0100_0000_101", -- RTI / Implied
daq when b"0110_0000_100", -- RTS / Implied
inc when b"0110_0000_101", -- RTS / Implied
inc when b"1110_1001_000", -- SBC / Immediate
inc when b"1110_0101_000", -- SBC / Zero Page
inc when b"1111_0101_000", -- SBC / Zero Page,X
inc when b"1110_1101_000", -- SBC / Absolute
inc when b"1110_1101_001", -- SBC / Absolute
inc when b"1111_1101_000", -- SBC / Absolute,X
inc when b"1111_1101_001", -- SBC / Absolute,X
inc when b"1111_1001_000", -- SBC / Absolute,Y
inc when b"1111_1001_001", -- SBC / Absolute,Y
inc when b"1110_0001_000", -- SBC / (Indirect,X)
inc when b"1111_0001_000", -- SBC / (Indirect),Y
inc when b"1000_0101_000", -- STA / Zero Page
inc when b"1001_0101_000", -- STA / Zero Page,X
inc when b"1000_1101_000", -- STA / Absolute
inc when b"1000_1101_001", -- STA / Absolute
inc when b"1001_1101_000", -- STA / Absolute,X
inc when b"1001_1101_001", -- STA / Absolute,X
inc when b"1001_1001_000", -- STA / Absolute,Y
inc when b"1001_1001_001", -- STA / Absolute,Y
inc when b"1000_0001_000", -- STA / (Indirect,X)
inc when b"1001_0001_000", -- STA / (Indirect),Y
inc when b"1000_0110_000", -- STX / Zero Page
inc when b"1001_0110_000", -- STX / Zero Page,Y
inc when b"1000_1110_000", -- STX / Absolute
inc when b"1000_1110_001", -- STX / Absolute
inc when b"1000_0100_000", -- STY / Zero Page
inc when b"1001_0100_000", -- STY / Zero Page,X
inc when b"1000_1100_000", -- STY / Absolute
inc when b"1000_1100_001", -- STY / Absolute
nop when others;
-- Input
with s_addr select o_in_op <=
ena when b"0111_1101_001", -- ADC / Absolute,X
ena when b"0111_1101_010", -- ADC / Absolute,X
ena when b"0111_1001_001", -- ADC / Absolute,Y
ena when b"0111_1001_010", -- ADC / Absolute,Y
ena when b"0110_0001_010", -- ADC / (Indirect,X)
ena when b"0110_0001_011", -- ADC / (Indirect,X)
ena when b"0111_0001_010", -- ADC / (Indirect),Y
ena when b"0111_0001_011", -- ADC / (Indirect),Y
ena when b"0011_1101_001", -- AND / Absolute,X
ena when b"0011_1101_010", -- AND / Absolute,X
ena when b"0011_1001_001", -- AND / Absolute,Y
ena when b"0011_1001_010", -- AND / Absolute,Y
ena when b"0010_0001_010", -- AND / (Indirect,X)
ena when b"0010_0001_011", -- AND / (Indirect,X)
ena when b"0011_0001_010", -- AND / (Indirect),Y
ena when b"0011_0001_011", -- AND / (Indirect),Y
alq when b"0000_0110_001", -- ASL / Zero Page
alq when b"0001_0110_010", -- ASL / Zero Page,X
ena when b"0000_1110_001", -- ASL / Absolute
ena when b"0001_1110_001", -- ASL / Absolute,X
ena when b"0001_1110_010", -- ASL / Absolute,X
ald when b"0001_1110_011", -- ASL / Absolute,X
fff when b"0000_0000_000", -- BRK / Implied
ena when b"0000_0000_101", -- BRK / Implied
ena when b"1101_1101_001", -- CMP / Absolute,X
ena when b"1101_1101_010", -- CMP / Absolute,X
ena when b"1101_1001_001", -- CMP / Absolute,Y
ena when b"1101_1001_010", -- CMP / Absolute,Y
ena when b"1100_0001_010", -- CMP / (Indirect,X)
ena when b"1100_0001_011", -- CMP / (Indirect,X)
ena when b"1101_0001_010", -- CMP / (Indirect),Y
ena when b"1101_0001_011", -- CMP / (Indirect),Y
ena when b"1100_0110_001", -- DEC / Zero Page
ena when b"1101_0110_001", -- DEC / Zero Page,X
alq when b"1101_0110_010", -- DEC / Zero Page,X
ena when b"1100_1110_001", -- DEC / Absolute
ena when b"1101_1110_001", -- DEC / Absolute,X
ena when b"1101_1110_010", -- DEC / Absolute,X
ald when b"1101_1110_011", -- DEC / Absolute,X
ena when b"0101_1101_001", -- EOR / Absolute,X
ena when b"0101_1101_010", -- EOR / Absolute,X
ena when b"0101_1001_001", -- EOR / Absolute,Y
ena when b"0101_1001_010", -- EOR / Absolute,Y
ena when b"0100_0001_010", -- EOR / (Indirect,X)
ena when b"0100_0001_011", -- EOR / (Indirect,X)
ena when b"0101_0001_010", -- EOR / (Indirect),Y
ena when b"0101_0001_011", -- EOR / (Indirect),Y
ena when b"1110_0110_001", -- INC / Zero Page
ena when b"1111_0110_001", -- INC / Zero Page,X
alq when b"1111_0110_010", -- INC / Zero Page,X
ena when b"1110_1110_001", -- INC / Absolute
ena when b"1111_1110_001", -- INC / Absolute,X
ena when b"1111_1110_010", -- INC / Absolute,X
ald when b"1111_1110_011", -- INC / Absolute,X
fff when b"0000_0011_000", -- INT / Implied
ena when b"0000_0011_101", -- INT / Implied
ena when b"0110_1100_010", -- JMP / Indirect
ena when b"0110_1100_011", -- JMP / Indirect
ena when b"0110_1100_100", -- JMP / Indirect
ena when b"0010_0000_001", -- JSR / Absolute
ena when b"1011_1101_001", -- LDA / Absolute,X
ena when b"1011_1101_010", -- LDA / Absolute,X
ena when b"1011_1001_001", -- LDA / Absolute,Y
ena when b"1011_1001_010", -- LDA / Absolute,Y
ena when b"1010_0001_010", -- LDA / (Indirect,X)
ena when b"1010_0001_011", -- LDA / (Indirect,X)
ena when b"1011_0001_010", -- LDA / (Indirect),Y
ena when b"1011_0001_011", -- LDA / (Indirect),Y
ena when b"1011_1110_001", -- LDX / Absolute,Y
ena when b"1011_1110_010", -- LDX / Absolute,Y
ena when b"1011_1100_001", -- LDY / Absolute,X
ena when b"1011_1100_010", -- LDY / Absolute,X
alq when b"0100_0110_001", -- LSR / Zero Page
alq when b"0101_0110_010", -- LSR / Zero Page,X
ena when b"0100_1110_001", -- LSR / Absolute
ena when b"0101_1110_001", -- LSR / Absolute,X
ena when b"0101_1110_010", -- LSR / Absolute,X
ald when b"0101_1110_011", -- LSR / Absolute,X
fff when b"0000_0100_000", -- NMI / Implied
ena when b"0000_0100_101", -- NMI / Implied
ena when b"0001_1101_001", -- ORA / Absolute,X
ena when b"0001_1101_010", -- ORA / Absolute,X
ena when b"0001_1001_001", -- ORA / Absolute,Y
ena when b"0001_1001_010", -- ORA / Absolute,Y
ena when b"0000_0001_010", -- ORA / (Indirect,X)
ena when b"0000_0001_011", -- ORA / (Indirect,X)
ena when b"0001_0001_010", -- ORA / (Indirect),Y
ena when b"0001_0001_011", -- ORA / (Indirect),Y
alq when b"0010_0110_001", -- ROL / Zero Page
alq when b"0011_0110_010", -- ROL / Zero Page,X
ena when b"0010_1110_001", -- ROL / Absolute
ena when b"0011_1110_001", -- ROL / Absolute,X
ena when b"0011_1110_010", -- ROL / Absolute,X
ald when b"0011_1110_011", -- ROL / Absolute,X
alq when b"0110_0110_001", -- ROR / Zero Page
alq when b"0111_0110_010", -- ROR / Zero Page,X
ena when b"0110_1110_001", -- ROR / Absolute
ena when b"0111_1110_001", -- ROR / Absolute,X
ena when b"0111_1110_010", -- ROR / Absolute,X
ald when b"0111_1110_011", -- ROR / Absolute,X
fff when b"0000_0010_000", -- RST / Implied
ena when b"0000_0010_010", -- RST / Implied
ena when b"0100_0000_100", -- RTI / Implied
ena when b"0110_0000_011", -- RTS / Implied
ena when b"1111_1101_001", -- SBC / Absolute,X
ena when b"1111_1101_010", -- SBC / Absolute,X
ena when b"1111_1001_001", -- SBC / Absolute,Y
ena when b"1111_1001_010", -- SBC / Absolute,Y
ena when b"1110_0001_010", -- SBC / (Indirect,X)
ena when b"1110_0001_011", -- SBC / (Indirect,X)
ena when b"1111_0001_010", -- SBC / (Indirect),Y
ena when b"1111_0001_011", -- SBC / (Indirect),Y
ena when b"1001_1101_001", -- STA / Absolute,X
ena when b"1001_1101_010", -- STA / Absolute,X
ena when b"1001_1001_001", -- STA / Absolute,Y
ena when b"1001_1001_010", -- STA / Absolute,Y
ena when b"1000_0001_010", -- STA / (Indirect,X)
ena when b"1000_0001_011", -- STA / (Indirect,X)
ena when b"1001_0001_010", -- STA / (Indirect),Y
ena when b"1001_0001_011", -- STA / (Indirect),Y
nop when others;
-- Output
with s_addr select o_out_op <=
ena when b"0000_0110_010", -- ASL / Zero Page
ena when b"0000_0110_011", -- ASL / Zero Page
ena when b"0001_0110_011", -- ASL / Zero Page,X
ena when b"0001_0110_100", -- ASL / Zero Page,X
din when b"0000_1110_011", -- ASL / Absolute
ena when b"0000_1110_100", -- ASL / Absolute
din when b"0001_1110_100", -- ASL / Absolute,X
ena when b"0001_1110_101", -- ASL / Absolute,X
pch when b"0000_0000_001", -- BRK / Implied
pcl when b"0000_0000_010", -- BRK / Implied
flg when b"0000_0000_011", -- BRK / Implied
ena when b"1100_0110_010", -- DEC / Zero Page
ena when b"1100_0110_011", -- DEC / Zero Page
ena when b"1101_0110_011", -- DEC / Zero Page,X
ena when b"1101_0110_100", -- DEC / Zero Page,X
din when b"1100_1110_011", -- DEC / Absolute
ena when b"1100_1110_100", -- DEC / Absolute
din when b"1101_1110_100", -- DEC / Absolute,X
ena when b"1101_1110_101", -- DEC / Absolute,X
ena when b"1110_0110_010", -- INC / Zero Page
ena when b"1110_0110_011", -- INC / Zero Page
ena when b"1111_0110_011", -- INC / Zero Page,X
ena when b"1111_0110_100", -- INC / Zero Page,X
din when b"1110_1110_011", -- INC / Absolute
ena when b"1110_1110_100", -- INC / Absolute
din when b"1111_1110_100", -- INC / Absolute,X
ena when b"1111_1110_101", -- INC / Absolute,X
pch when b"0000_0011_001", -- INT / Implied
pcl when b"0000_0011_010", -- INT / Implied
flg when b"0000_0011_011", -- INT / Implied
pch when b"0010_0000_010", -- JSR / Absolute
pcl when b"0010_0000_011", -- JSR / Absolute
ena when b"0100_0110_010", -- LSR / Zero Page
ena when b"0100_0110_011", -- LSR / Zero Page
ena when b"0101_0110_011", -- LSR / Zero Page,X
ena when b"0101_0110_100", -- LSR / Zero Page,X
din when b"0100_1110_011", -- LSR / Absolute
ena when b"0100_1110_100", -- LSR / Absolute
din when b"0101_1110_100", -- LSR / Absolute,X
ena when b"0101_1110_101", -- LSR / Absolute,X
pch when b"0000_0100_001", -- NMI / Implied
pcl when b"0000_0100_010", -- NMI / Implied
flg when b"0000_0100_011", -- NMI / Implied
arg when b"0100_1000_001", -- PHA / Implied
flg when b"0000_1000_001", -- PHP / Implied
ena when b"0010_0110_010", -- ROL / Zero Page
ena when b"0010_0110_011", -- ROL / Zero Page
ena when b"0011_0110_011", -- ROL / Zero Page,X
ena when b"0011_0110_100", -- ROL / Zero Page,X
din when b"0010_1110_011", -- ROL / Absolute
ena when b"0010_1110_100", -- ROL / Absolute
din when b"0011_1110_100", -- ROL / Absolute,X
ena when b"0011_1110_101", -- ROL / Absolute,X
ena when b"0110_0110_010", -- ROR / Zero Page
ena when b"0110_0110_011", -- ROR / Zero Page
ena when b"0111_0110_011", -- ROR / Zero Page,X
ena when b"0111_0110_100", -- ROR / Zero Page,X
din when b"0110_1110_011", -- ROR / Absolute
ena when b"0110_1110_100", -- ROR / Absolute
din when b"0111_1110_100", -- ROR / Absolute,X
ena when b"0111_1110_101", -- ROR / Absolute,X
arg when b"1000_0101_001", -- STA / Zero Page
arg when b"1001_0101_010", -- STA / Zero Page,X
arg when b"1000_1101_010", -- STA / Absolute
arg when b"1001_1101_011", -- STA / Absolute,X
arg when b"1001_1001_011", -- STA / Absolute,Y
arg when b"1000_0001_100", -- STA / (Indirect,X)
arg when b"1001_0001_100", -- STA / (Indirect),Y
xrg when b"1000_0110_001", -- STX / Zero Page
xrg when b"1001_0110_010", -- STX / Zero Page,Y
xrg when b"1000_1110_010", -- STX / Absolute
yrg when b"1000_0100_001", -- STY / Zero Page
yrg when b"1001_0100_010", -- STY / Zero Page,X
yrg when b"1000_1100_010", -- STY / Absolute
nop when others;
-- Flags
with s_addr select o_flags_op <=
nvzc when b"0110_1001_001", -- ADC / Immediate
nvzc when b"0110_0101_010", -- ADC / Zero Page
nvzc when b"0111_0101_011", -- ADC / Zero Page,X
nvzc when b"0110_1101_011", -- ADC / Absolute
nvzc when b"0111_1101_100", -- ADC / Absolute,X
nvzc when b"0111_1001_100", -- ADC / Absolute,Y
nvzc when b"0110_0001_101", -- ADC / (Indirect,X)
nvzc when b"0111_0001_101", -- ADC / (Indirect),Y
nz when b"0010_1001_001", -- AND / Immediate
nz when b"0010_0101_010", -- AND / Zero Page
nz when b"0011_0101_011", -- AND / Zero Page,X
nz when b"0010_1101_011", -- AND / Absolute
nz when b"0011_1101_100", -- AND / Absolute,X
nz when b"0011_1001_100", -- AND / Absolute,Y
nz when b"0010_0001_101", -- AND / (Indirect,X)
nz when b"0011_0001_101", -- AND / (Indirect),Y
nzc when b"0000_1010_001", -- ASL / Accumulator
nzc when b"0000_0110_011", -- ASL / Zero Page
nzc when b"0001_0110_100", -- ASL / Zero Page,X
nzc when b"0000_1110_100", -- ASL / Absolute
nzc when b"0001_1110_101", -- ASL / Absolute,X
nzv when b"0010_0100_010", -- BIT / Zero Page
nzv when b"0010_1100_011", -- BIT / Absolute
sei when b"0000_0000_011", -- BRK / Implied
clc when b"0001_1000_000", -- CLC / Implied
cld when b"1101_1000_000", -- CLD / Implied
cli when b"0101_1000_000", -- CLI / Implied
clv when b"1011_1000_000", -- CLV / Implied
nzc when b"1100_1001_001", -- CMP / Immediate
nzc when b"1100_0101_010", -- CMP / Zero Page
nzc when b"1101_0101_011", -- CMP / Zero Page,X
nzc when b"1100_1101_011", -- CMP / Absolute
nzc when b"1101_1101_100", -- CMP / Absolute,X
nzc when b"1101_1001_100", -- CMP / Absolute,Y
nzc when b"1100_0001_101", -- CMP / (Indirect,X)
nzc when b"1101_0001_101", -- CMP / (Indirect),Y
nzc when b"1110_0000_001", -- CPX / Immediate
nzc when b"1110_0100_010", -- CPX / Zero Page
nzc when b"1110_1100_011", -- CPX / Absolute
nzc when b"1100_0000_001", -- CPY / Immediate
nzc when b"1100_0100_010", -- CPY / Zero Page
nzc when b"1100_1100_011", -- CPY / Absolute
nz when b"1100_0110_011", -- DEC / Zero Page
nz when b"1101_0110_100", -- DEC / Zero Page,X
nz when b"1100_1110_100", -- DEC / Absolute
nz when b"1101_1110_101", -- DEC / Absolute,X
nz when b"1100_1010_001", -- DEX / Implied
nz when b"1000_1000_001", -- DEY / Implied
nz when b"0100_1001_001", -- EOR / Immediate
nz when b"0100_0101_010", -- EOR / Zero Page
nz when b"0101_0101_011", -- EOR / Zero Page,X
nz when b"0100_1101_011", -- EOR / Absolute
nz when b"0101_1101_100", -- EOR / Absolute,X
nz when b"0101_1001_100", -- EOR / Absolute,Y
nz when b"0100_0001_101", -- EOR / (Indirect,X)
nz when b"0101_0001_101", -- EOR / (Indirect),Y
nz when b"1110_0110_011", -- INC / Zero Page
nz when b"1111_0110_100", -- INC / Zero Page,X
nz when b"1110_1110_100", -- INC / Absolute
nz when b"1111_1110_101", -- INC / Absolute,X
sei when b"0000_0011_011", -- INT / Implied
nz when b"1110_1000_001", -- INX / Implied
nz when b"1100_1000_001", -- INY / Implied
nz when b"1010_1001_001", -- LDA / Immediate
nz when b"1010_0101_010", -- LDA / Zero Page
nz when b"1011_0101_011", -- LDA / Zero Page,X
nz when b"1010_1101_011", -- LDA / Absolute
nz when b"1011_1101_100", -- LDA / Absolute,X
nz when b"1011_1001_100", -- LDA / Absolute,Y
nz when b"1010_0001_101", -- LDA / (Indirect,X)
nz when b"1011_0001_101", -- LDA / (Indirect),Y
nz when b"1010_0010_001", -- LDX / Immediate
nz when b"1010_0110_010", -- LDX / Zero Page
nz when b"1011_0110_011", -- LDX / Zero Page,Y
nz when b"1010_1110_011", -- LDX / Absolute
nz when b"1011_1110_100", -- LDX / Absolute,Y
nz when b"1010_0000_001", -- LDY / Immediate
nz when b"1010_0100_010", -- LDY / Zero Page
nz when b"1011_0100_011", -- LDY / Zero Page,X
nz when b"1010_1100_011", -- LDY / Absolute
nz when b"1011_1100_100", -- LDY / Absolute,X
nzc when b"0100_1010_001", -- LSR / Accumulator
nzc when b"0100_0110_011", -- LSR / Zero Page
nzc when b"0101_0110_100", -- LSR / Zero Page,X
nzc when b"0100_1110_100", -- LSR / Absolute
nzc when b"0101_1110_101", -- LSR / Absolute,X
sei when b"0000_0100_011", -- NMI / Implied
nz when b"0000_1001_001", -- ORA / Immediate
nz when b"0000_0101_010", -- ORA / Zero Page
nz when b"0001_0101_011", -- ORA / Zero Page,X
nz when b"0000_1101_011", -- ORA / Absolute
nz when b"0001_1101_100", -- ORA / Absolute,X
nz when b"0001_1001_100", -- ORA / Absolute,Y
nz when b"0000_0001_101", -- ORA / (Indirect,X)
nz when b"0001_0001_101", -- ORA / (Indirect),Y
nz when b"0110_1000_011", -- PLA / Implied
din when b"0010_1000_011", -- PLP / Implied
nzc when b"0010_1010_001", -- ROL / Accumulator
nzc when b"0010_0110_011", -- ROL / Zero Page
nzc when b"0011_0110_100", -- ROL / Zero Page,X
nzc when b"0010_1110_100", -- ROL / Absolute
nzc when b"0011_1110_101", -- ROL / Absolute,X
nzc when b"0110_1010_001", -- ROR / Accumulator
nzc when b"0110_0110_011", -- ROR / Zero Page
nzc when b"0111_0110_100", -- ROR / Zero Page,X
nzc when b"0110_1110_100", -- ROR / Absolute
nzc when b"0111_1110_101", -- ROR / Absolute,X
din when b"0100_0000_011", -- RTI / Implied
nvzc when b"1110_1001_001", -- SBC / Immediate
nvzc when b"1110_0101_010", -- SBC / Zero Page
nvzc when b"1111_0101_011", -- SBC / Zero Page,X
nvzc when b"1110_1101_011", -- SBC / Absolute
nvzc when b"1111_1101_100", -- SBC / Absolute,X
nvzc when b"1111_1001_100", -- SBC / Absolute,Y
nvzc when b"1110_0001_101", -- SBC / (Indirect,X)
nvzc when b"1111_0001_101", -- SBC / (Indirect),Y
stc when b"0011_1000_000", -- SEC / Implied
sed when b"1111_1000_000", -- SED / Implied
sei when b"0111_1000_000", -- SEI / Implied
nz when b"1010_1010_001", -- TAX / Implied
nz when b"1010_1000_001", -- TAY / Implied
nz when b"1011_1010_001", -- TSX / Implied
nz when b"1000_1010_001", -- TXA / Implied
nz when b"1001_1000_001", -- TYA / Implied
nop when others;
-- ALU Operation
with s_addr select o_alu_op <=
adc when b"0110_1001_001", -- ADC / Immediate
adc when b"0110_0101_010", -- ADC / Zero Page
add when b"0111_0101_010", -- ADC / Zero Page,X
adc when b"0111_0101_011", -- ADC / Zero Page,X
adc when b"0110_1101_011", -- ADC / Absolute
add when b"0111_1101_010", -- ADC / Absolute,X
add when b"0111_1101_011", -- ADC / Absolute,X
adc when b"0111_1101_100", -- ADC / Absolute,X
add when b"0111_1001_010", -- ADC / Absolute,Y
add when b"0111_1001_011", -- ADC / Absolute,Y
adc when b"0111_1001_100", -- ADC / Absolute,Y
add when b"0110_0001_010", -- ADC / (Indirect,X)
add when b"0110_0001_011", -- ADC / (Indirect,X)
adc when b"0110_0001_101", -- ADC / (Indirect,X)
add when b"0111_0001_010", -- ADC / (Indirect),Y
add when b"0111_0001_011", -- ADC / (Indirect),Y
add when b"0111_0001_100", -- ADC / (Indirect),Y
adc when b"0111_0001_101", -- ADC / (Indirect),Y
ada when b"0010_1001_001", -- AND / Immediate
ada when b"0010_0101_010", -- AND / Zero Page
add when b"0011_0101_010", -- AND / Zero Page,X
ada when b"0011_0101_011", -- AND / Zero Page,X
ada when b"0010_1101_011", -- AND / Absolute
add when b"0011_1101_010", -- AND / Absolute,X
add when b"0011_1101_011", -- AND / Absolute,X
ada when b"0011_1101_100", -- AND / Absolute,X
add when b"0011_1001_010", -- AND / Absolute,Y
add when b"0011_1001_011", -- AND / Absolute,Y
ada when b"0011_1001_100", -- AND / Absolute,Y
add when b"0010_0001_010", -- AND / (Indirect,X)
add when b"0010_0001_011", -- AND / (Indirect,X)
ada when b"0010_0001_101", -- AND / (Indirect,X)
add when b"0011_0001_010", -- AND / (Indirect),Y
add when b"0011_0001_011", -- AND / (Indirect),Y
add when b"0011_0001_100", -- AND / (Indirect),Y
ada when b"0011_0001_101", -- AND / (Indirect),Y
asl when b"0000_1010_001", -- ASL / Accumulator
asl when b"0000_0110_011", -- ASL / Zero Page
add when b"0001_0110_010", -- ASL / Zero Page,X
asl when b"0001_0110_100", -- ASL / Zero Page,X
asl when b"0000_1110_100", -- ASL / Absolute
add when b"0001_1110_010", -- ASL / Absolute,X
add when b"0001_1110_011", -- ASL / Absolute,X
asl when b"0001_1110_101", -- ASL / Absolute,X
add when b"1001_0000_001", -- BCC / Relative
add when b"1001_0000_010", -- BCC / Relative
add when b"1011_0000_001", -- BCS / Relative
add when b"1011_0000_010", -- BCS / Relative
add when b"1111_0000_001", -- BEQ / Relative
add when b"1111_0000_010", -- BEQ / Relative
ada when b"0010_0100_010", -- BIT / Zero Page
ada when b"0010_1100_011", -- BIT / Absolute
add when b"0011_0000_001", -- BMI / Relative
add when b"0011_0000_010", -- BMI / Relative
add when b"1101_0000_001", -- BNE / Relative
add when b"1101_0000_010", -- BNE / Relative
add when b"0001_0000_001", -- BPL / Relative
add when b"0001_0000_010", -- BPL / Relative
sub when b"0000_0000_001", -- BRK / Implied
sub when b"0000_0000_010", -- BRK / Implied
sub when b"0000_0000_011", -- BRK / Implied
add when b"0000_0000_101", -- BRK / Implied
add when b"0101_0000_001", -- BVC / Relative
add when b"0101_0000_010", -- BVC / Relative
add when b"0111_0000_001", -- BVS / Relative
add when b"0111_0000_010", -- BVS / Relative
sub when b"1100_1001_001", -- CMP / Immediate
sub when b"1100_0101_010", -- CMP / Zero Page
add when b"1101_0101_010", -- CMP / Zero Page,X
sub when b"1101_0101_011", -- CMP / Zero Page,X
sub when b"1100_1101_011", -- CMP / Absolute
add when b"1101_1101_010", -- CMP / Absolute,X
add when b"1101_1101_011", -- CMP / Absolute,X
sub when b"1101_1101_100", -- CMP / Absolute,X
add when b"1101_1001_010", -- CMP / Absolute,Y
add when b"1101_1001_011", -- CMP / Absolute,Y
sub when b"1101_1001_100", -- CMP / Absolute,Y
add when b"1100_0001_010", -- CMP / (Indirect,X)
add when b"1100_0001_011", -- CMP / (Indirect,X)
sub when b"1100_0001_101", -- CMP / (Indirect,X)
add when b"1101_0001_010", -- CMP / (Indirect),Y
add when b"1101_0001_011", -- CMP / (Indirect),Y
add when b"1101_0001_100", -- CMP / (Indirect),Y
sub when b"1101_0001_101", -- CMP / (Indirect),Y
sub when b"1110_0000_001", -- CPX / Immediate
sub when b"1110_0100_010", -- CPX / Zero Page
sub when b"1110_1100_011", -- CPX / Absolute
sub when b"1100_0000_001", -- CPY / Immediate
sub when b"1100_0100_010", -- CPY / Zero Page
sub when b"1100_1100_011", -- CPY / Absolute
sub when b"1100_0110_011", -- DEC / Zero Page
add when b"1101_0110_010", -- DEC / Zero Page,X
sub when b"1101_0110_100", -- DEC / Zero Page,X
sub when b"1100_1110_100", -- DEC / Absolute
add when b"1101_1110_010", -- DEC / Absolute,X
add when b"1101_1110_011", -- DEC / Absolute,X
sub when b"1101_1110_101", -- DEC / Absolute,X
sub when b"1100_1010_001", -- DEX / Implied
sub when b"1000_1000_001", -- DEY / Implied
eor when b"0100_1001_001", -- EOR / Immediate
eor when b"0100_0101_010", -- EOR / Zero Page
add when b"0101_0101_010", -- EOR / Zero Page,X
eor when b"0101_0101_011", -- EOR / Zero Page,X
eor when b"0100_1101_011", -- EOR / Absolute
add when b"0101_1101_010", -- EOR / Absolute,X
add when b"0101_1101_011", -- EOR / Absolute,X
eor when b"0101_1101_100", -- EOR / Absolute,X
add when b"0101_1001_010", -- EOR / Absolute,Y
add when b"0101_1001_011", -- EOR / Absolute,Y
eor when b"0101_1001_100", -- EOR / Absolute,Y
add when b"0100_0001_010", -- EOR / (Indirect,X)
add when b"0100_0001_011", -- EOR / (Indirect,X)
eor when b"0100_0001_101", -- EOR / (Indirect,X)
add when b"0101_0001_010", -- EOR / (Indirect),Y
add when b"0101_0001_011", -- EOR / (Indirect),Y
add when b"0101_0001_100", -- EOR / (Indirect),Y
eor when b"0101_0001_101", -- EOR / (Indirect),Y
add when b"1110_0110_011", -- INC / Zero Page
add when b"1111_0110_010", -- INC / Zero Page,X
add when b"1111_0110_100", -- INC / Zero Page,X
add when b"1110_1110_100", -- INC / Absolute
add when b"1111_1110_010", -- INC / Absolute,X
add when b"1111_1110_011", -- INC / Absolute,X
add when b"1111_1110_101", -- INC / Absolute,X
sub when b"0000_0011_001", -- INT / Implied
sub when b"0000_0011_010", -- INT / Implied
sub when b"0000_0011_011", -- INT / Implied
add when b"0000_0011_101", -- INT / Implied
add when b"1110_1000_001", -- INX / Implied
add when b"1100_1000_001", -- INY / Implied
add when b"0110_1100_011", -- JMP / Indirect
sub when b"0010_0000_011", -- JSR / Absolute
sub when b"0010_0000_100", -- JSR / Absolute
add when b"1011_0101_010", -- LDA / Zero Page,X
add when b"1011_1101_010", -- LDA / Absolute,X
add when b"1011_1101_011", -- LDA / Absolute,X
add when b"1011_1001_010", -- LDA / Absolute,Y
add when b"1011_1001_011", -- LDA / Absolute,Y
add when b"1010_0001_010", -- LDA / (Indirect,X)
add when b"1010_0001_011", -- LDA / (Indirect,X)
add when b"1011_0001_010", -- LDA / (Indirect),Y
add when b"1011_0001_011", -- LDA / (Indirect),Y
add when b"1011_0001_100", -- LDA / (Indirect),Y
add when b"1011_0110_010", -- LDX / Zero Page,Y
add when b"1011_1110_010", -- LDX / Absolute,Y
add when b"1011_1110_011", -- LDX / Absolute,Y
add when b"1011_0100_010", -- LDY / Zero Page,X
add when b"1011_1100_010", -- LDY / Absolute,X
add when b"1011_1100_011", -- LDY / Absolute,X
lsr when b"0100_1010_001", -- LSR / Accumulator
lsr when b"0100_0110_011", -- LSR / Zero Page
add when b"0101_0110_010", -- LSR / Zero Page,X
lsr when b"0101_0110_100", -- LSR / Zero Page,X
lsr when b"0100_1110_100", -- LSR / Absolute
add when b"0101_1110_010", -- LSR / Absolute,X
add when b"0101_1110_011", -- LSR / Absolute,X
lsr when b"0101_1110_101", -- LSR / Absolute,X
sub when b"0000_0100_001", -- NMI / Implied
sub when b"0000_0100_010", -- NMI / Implied
sub when b"0000_0100_011", -- NMI / Implied
add when b"0000_0100_101", -- NMI / Implied
ora when b"0000_1001_001", -- ORA / Immediate
ora when b"0000_0101_010", -- ORA / Zero Page
add when b"0001_0101_010", -- ORA / Zero Page,X
ora when b"0001_0101_011", -- ORA / Zero Page,X
ora when b"0000_1101_011", -- ORA / Absolute
add when b"0001_1101_010", -- ORA / Absolute,X
add when b"0001_1101_011", -- ORA / Absolute,X
ora when b"0001_1101_100", -- ORA / Absolute,X
add when b"0001_1001_010", -- ORA / Absolute,Y
add when b"0001_1001_011", -- ORA / Absolute,Y
ora when b"0001_1001_100", -- ORA / Absolute,Y
add when b"0000_0001_010", -- ORA / (Indirect,X)
add when b"0000_0001_011", -- ORA / (Indirect,X)
ora when b"0000_0001_101", -- ORA / (Indirect,X)
add when b"0001_0001_010", -- ORA / (Indirect),Y
add when b"0001_0001_011", -- ORA / (Indirect),Y
add when b"0001_0001_100", -- ORA / (Indirect),Y
ora when b"0001_0001_101", -- ORA / (Indirect),Y
sub when b"0100_1000_010", -- PHA / Implied
sub when b"0000_1000_010", -- PHP / Implied
add when b"0110_1000_010", -- PLA / Implied
add when b"0010_1000_010", -- PLP / Implied
add when b"0000_0010_010", -- RST / Implied
add when b"0100_0000_010", -- RTI / Implied
add when b"0100_0000_011", -- RTI / Implied
add when b"0100_0000_100", -- RTI / Implied
add when b"0110_0000_010", -- RTS / Implied
add when b"0110_0000_011", -- RTS / Implied
rla when b"0010_1010_001", -- ROL / Accumulator
rla when b"0010_0110_011", -- ROL / Zero Page
add when b"0011_0110_010", -- ROL / Zero Page,X
rla when b"0011_0110_100", -- ROL / Zero Page,X
rla when b"0010_1110_100", -- ROL / Absolute
add when b"0011_1110_010", -- ROL / Absolute,X
add when b"0011_1110_011", -- ROL / Absolute,X
rla when b"0011_1110_101", -- ROL / Absolute,X
rra when b"0110_1010_001", -- ROR / Accumulator
rra when b"0110_0110_011", -- ROR / Zero Page
add when b"0111_0110_010", -- ROR / Zero Page,X
rra when b"0111_0110_100", -- ROR / Zero Page,X
rra when b"0110_1110_100", -- ROR / Absolute
add when b"0111_1110_010", -- ROR / Absolute,X
add when b"0111_1110_011", -- ROR / Absolute,X
rra when b"0111_1110_101", -- ROR / Absolute,X
sbc when b"1110_1001_001", -- SBC / Immediate
sbc when b"1110_0101_010", -- SBC / Zero Page
add when b"1111_0101_010", -- SBC / Zero Page,X
sbc when b"1111_0101_011", -- SBC / Zero Page,X
sbc when b"1110_1101_011", -- SBC / Absolute
add when b"1111_1101_010", -- SBC / Absolute,X
add when b"1111_1101_011", -- SBC / Absolute,X
sbc when b"1111_1101_100", -- SBC / Absolute,X
add when b"1111_1001_010", -- SBC / Absolute,Y
add when b"1111_1001_011", -- SBC / Absolute,Y
sbc when b"1111_1001_100", -- SBC / Absolute,Y
add when b"1110_0001_010", -- SBC / (Indirect,X)
add when b"1110_0001_011", -- SBC / (Indirect,X)
sbc when b"1110_0001_101", -- SBC / (Indirect,X)
add when b"1111_0001_010", -- SBC / (Indirect),Y
add when b"1111_0001_011", -- SBC / (Indirect),Y
add when b"1111_0001_100", -- SBC / (Indirect),Y
sbc when b"1111_0001_101", -- SBC / (Indirect),Y
add when b"1000_0101_010", -- STA / Zero Page
add when b"1001_0101_010", -- STA / Zero Page,X
add when b"1001_1101_010", -- STA / Absolute,X
add when b"1001_1101_011", -- STA / Absolute,X
add when b"1001_1001_010", -- STA / Absolute,Y
add when b"1001_1001_011", -- STA / Absolute,Y
add when b"1000_0001_010", -- STA / (Indirect,X)
add when b"1000_0001_011", -- STA / (Indirect,X)
add when b"1001_0001_010", -- STA / (Indirect),Y