[求助]如何使用critical range?

jiming

DC user guide中的8-38處有一個例子：
% q* V. _# P$ @+ v+ s
8 z. M( D0 j4 |) i2 ^+ BFor example, if the critical range is 2.0ns and the worst violator has a delay of 10.0ns, Design Compiler optimizes all paths that have a delay between 8.0ns and 10.0ns.

- \; T7 G. M# i請問各位高手， 8.0ns 和 10.0ns 是怎麼計算出來的？

trick660

意思是說
3 O  E0 `6 W2 m' L; H! f3 R如果path group內worst violator的path delay = 10ns
" y  [  @1 _/ q' `而你的critical_range = 2ns的話
那麼DC就會去對該path group內所有path delay落在(10-2 = 8)ns 到 10ns間的path做optimize的動作