enum_things_demo.py

# Table of instructions by opcode - name,  addressing mode, cycles, bytes
_instruction_table = {
    0x00: ["BRK", AddressingMode.IMPLIED, 7, 1],
    0xA9: ["LDA", AddressingMode.I, 2, 2],
    0x4C: ["JMP", AddressingMode.ABSOLUTE, 3, 3],
    0xEA: ["NOP", AddressingMode.IMPLIED, 2, 1],
}

# Enum of all instruction names.
InstructionName = IntEnum("InstructionName", [(v[0], k) for k, v in _instruction_table.items()])

instr_name = Signal(shape=InstructionName, decoder=InstructionName)