Resizing Your Expectations: Mastering Timing Closure with OpenROAD's Evolving Optimizer
summary
OpenROAD’s Resizer operates as a physical-synthesis engine that already performs swap VTH, buffering, cloning and load splitting and reports iterative passes over 800 endpoints showing slack and total negative slack; it runs endpoint-by-endpoint, optimizes the worst path using an Elmore delay model locally and then relies on static timing as the golden truth. Recent additions include a runtime-configurable move sequence and an almost-ready size down move; current limits are two-corner operation, serial ECO evaluation, and blind spots when the worst path is unfixable.
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chapters (5)
- 0:00Introduction to the resizer
- 3:49Design flow integration
- 5:27Techniques and improvements
- 11:25Transition to Q&A
- 17:59Closing remarks
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