best worst library sta late early
Hi Sunil,
Your understanding regarding PVT corner is correct.
But when you are doing OCV analysis, consider path between reg to reg, the delay on the data path should be worst delay, the delay of capture clock should be best delay, the delay of the launch clock should be again worst.
The worst delay will get on Max corner and best delay will be on min corner.
This kind of analysis will lead to a too pessimistic results. So what STA tool will does is for given corner it will create two library i.e if you consider max delay corner, it will create worst of worst delay library and worst of best delay library depending upon ocv derate values. Now if consider again the same reg to reg path, the delay on the data path will be worst of worst delay, the delay of capture clock will be best of worst delay, the delay of the launch clock will be worst of worst delay.