Levels of AbstractionLogic Level

• Behavioral domain

  • Also known as Gate Level
  • Boolean equations and finite automata

• Structural Level

  • Gates, Flip-flops, and registers

• Physical domain

  • Realizable hardware, such as TTL-based components

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Timing and constraints become increasingly detailed, possibly in all three domains.

Timing may include reference to arbitrary transitions, edges, or levels, and may include setup and hold requirements, propagation delays, etc.