在encounter中timing 时setup 和 hold 相对于uncertainty设置的时间最小值为多少

xjg@hmes

回复 10# jimin_qu


    Note：
The PLL jitter needs not be cnsidered at hold check value,because the
same edge as the CK is checked.However,the pll jitter needs to be considered
when the edge is different than the CK or when the clock domain is different
than the CK.

小豆丁

回复 4# 陈涛


   版主，问个问题，我现在有个大周期的时钟325000ns。uncertainty设置为70.结果出现很大的hold违例。这种时钟设置是否合理？我猜想，是否可以认为一条理想时钟？谢谢