Instruction unit

The instruction unit (I-unit or IU), 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 (E-unit or EU). 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.^[1]

In the simplest style of

• Branch prediction
  and the branch prediction buffer
  • Branch target predictor and the branch target buffer
  • Branch delay slot
• Instruction scheduling
  • Instruction selection
  • data hazard
  • Scoreboarding
• Very long instruction word (VLIW)
• Superscalar
  processor
• Opcode
• Analysis of Instruction parallelism, Instruction frequencies, Instruction mix
  • Instruction path length or Instruction count

References

This microcomputer- or microprocessor-related article is a stub. You can help Wikipedia by expanding it.

• v
• t
• e