DC：set_clock_uncertainty问题

hxx52021

解释的很好

HADIST

回复 10# 雷翔舞


   因为setup的uncertainty是jitter+skew，hold仅仅是skew，值可能是不一样的

zhangbinsniper

这个是对时序的过约束啊

newwalkman

回复 12# HADIST


    为什么setup,holdup的uncertain会不一样呢？

花涛

学习了！！！！

ghxy

The set_clock_uncertainty specifies a window within which a clock edge can occur. The uncertainty in the timing of the clock edge is to account for several factors such as clock period jitter and additional margins used for timing verification. Every real clock source has a finite amount of jitter - a window within which a clock edge can occur. The clock period jitter is determined by the type of clock generator utilized. In reality, there are no ideal clocks, that is, all clocks have a finite amount of jitter and the clock period jitter should be included while specifying the clock uncertainty.

caoshujia

xeixie xuexile

mmffss2007

看看。。。。

zxyglx

xbuilder

看看