[求助]如何使用critical range?

jiming

DC user guide中的8-38處有一個例子：

) F  {/ y# z: f" n6 eFor 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.
) G1 ~% F; Y2 }1 B# i3 c% 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
4 J, i- R/ T/ D$ [( O: W( k如果path group內worst violator的path delay = 10ns
# |9 ~' t* _4 V9 g  e# a4 M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