Detracting factor applied for the common clock path

[aditya1579]

All,

What derating factor do we apply for the common clock path between launch and capture clocks, when calculating CPPR or common path pessimism removal ?

And what is the reason ?

Aditya

 

[rca]

I usually used 5% derating on data and clock, during PnR and STA. that gives more margin.
It s good to enable by default the CPPR, to removed the derating impact for the common part of the launch and capture paths.

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Because for the common path, it could not be worst for the launch and debate for the capture path for the same analys.