About hold margin in timing signoff

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littlej_zju

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ocv hold margin

In timing signoff condition, there is ocv+100ps hold margin for hold time check.
Where does the "100ps" come from?
Is it related with design speed? (For 400Mhz or 800Mhz design, do they use the same hold margin?)
 

timing hold check

Mintime is frequency independent.

OCV+100ps hold margin is just making hold check more pessimistic in case OCV itself did not account for all process variations.

The 100ps is probably set in your STA script. Timing margin is often inheired from previous project or similar tape-outs.
 

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