yes...i have also seen set_clock_uncertainty in the sdc file...
so...the clock margin and clock uncertainty have nearly the same function in our sdc file?
but, the clock margin is used in both setup &hold timing(for it does not point to setup or hold seperately), for clock_uncertainty, u can use set_clock_uncertainty -setup/-hold, so u can use different uncertainty in setup and hold.
and i have seen: normally set_clock_uncertainty, for -setup option, use a larger uncertainty(i.e 0.750), for -hold option, use a less uncertainty(i.e 0.075),could u please kindly expain more about this? does that mean we should focus more on setup timing?
thank u very much...i have learned a lot from your reply!