Metric · Physical Design & Signoff
Slack
The margin on a timing check, computed as required time minus arrival time for setup and arrival minus required for hold. Positive slack means the check passes; negative slack is the amount by which it fails.
- Also known as
- Timing slack
- Type
- Metric
- Domain
- Physical Design & Signoff, Timing signoff
Notes
Slack is the universal currency of implementation: nearly every optimisation is scored by its effect on it.
Related terms
Part of the Physical Design & Signoff glossary, with every term in the topic and the lifecycles, tools and standards that use them.
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