Instruction unit

Computer component responsible for organising program instructions to be fetched from memory

The instruction unit, also called, e.g., instruction fetch unit (IFU), instruction issue unit (IIU), instruction sequencing unit (ISU), in a central processing unit (CPU) is responsible for organizing program instructions to be fetched from memory, and executed, in an appropriate order, and for forwarding them to an execution unit. The I-unit may also do, e.g., address resolution, pre-fetching, prior to forwarding an instruction. It is a part of the control unit, which in turn is part of the CPU.

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