Hi, I only have got one nxtgrd file from foundry, so only one SPEF was extracted by STAR_RCXT. But I want to do STA in primetime at two coner (worst and best), what should I do?
I don't think corner information is included in your nxtgrd file. And I think STA use corner information (if it can) to calculate only gate delay, so the corner information is possibly ignored in interconnection delay calculation.
I don't think corner information is included in your nxtgrd file. And I think STA use corner information (if it can) to calculate only gate delay, so the corner information is possibly ignored in interconnection delay calculation.
Correct me if I'm wrong, but I think StarRC extraction and StarRC RC-netlisting are two different steps of the StarRC flow.
Only one nxtgrd file is needed for StarRC extraction. Then StarRC can produce RC netlists for multiple extraction corners (rcbest, rcworst, cbest, ...) using that same extraction.
The designer has to decide which extraction corner(s) to use to close min and max time.