Question

What is instruction format in computer architecture?

Answer 1

An instruction format defines the layout of the bits of an instruction, in terms of its constituents parts. An instruction format must include an opcode and, implicitly or explicitly, zero or more operands. Each explit operand is referenced using one of the addressing mode that is available for that machine. The format must, implicitly or explictly, indicate the addressing mode of each operand. For most instruction sets, more than one instruction format is used.