noun
instruction format
Computing term for the layout or structure of a machine instruction.
このプロセッサの命令形式は32ビット固定長です。
The instruction format of this processor is a fixed 32-bit length.
命令セット (instruction set) refers to the entire collection of instructions a processor can execute, while 命令形式 describes the binary layout of a single instruction.
Compound of 命令 (instruction) and 形式 (format).