Microarchitecture

Microarchitecture is ways to implement an architecture.

Classifications

• Single-cycle architectures execute each instruction in a single cycle
  • Simple
  • Cycle time limited by longest instruction
  • Separate memories for instruction and data
  • 3 adders
• Multicycle architecture break up each instruction into a series of short steps
  • Shorter instructions take fewer steps
  • Can re-use hardware
  • Faster cycle time
• Pipelined architecture are multicycle, and multiple instructions execute at once
  • Temporal parallelism
  • Basically every CPU these days