PT OCV学习笔记

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PT OCV学习笔记

In the OCV mode, PrimeTime performs a conservative analysis that allows both minimum and maximum delays to apply to different paths at the same time. For a setup check, it uses maximum delays for the launch clock path and data path, and minimum delays for the capture clock path. For a hold check, it uses minimum delays for the launch clock path and data path, and maximum delays for the capture clock path.



set_operating_conditions -analysis_type on_chip_variation WCCOM

## 5% derate for clock & data path set_timing_derate -early -cell_delay 0.95 set_timing_derate -late -cell_delay 1.05

Early path delays include the capture clock path for a setup check, and the launch clock path and data path for a hold check. Late path delays include the launch clock path and data path for a setup check, and the capture clock path for a hold check.



Clock Reconvergence Pessimism Removal

Clock reconvergence pessimism is an accuracy limitation that occurs when two different clock paths partially share a common physical path segment and the shared segment is assumed to have a minimum delay for one path and a maximum delay for the other path. This condition can occur any time that launch and capture clock paths use different delays, most commonly with OCV analysis.

Automated correction of this inaccuracy is called clock reconvergence pessimism removal(CRPR).



set timing_remove_clock_reconvergence_pessimism true

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