Tradeoffs: Choosing the best realization

• Two-level logic usually has minimum delay

  • Usually means faster circuits
    • Often requires more gates (more transistors)
    • Often requires more wires (more circuit area)
  • Sometimes requires large fan-ins
    • Can mean slower gates
  • Easier to eliminate hazards

• Multilevel logic usually requires less gates

  • Usually means smaller circuits
    • Less gates and less wires
  • Can have dynamic hazards

Previous slide

Next slide

Back to first slide

View graphic version