ICC中enable_recovery_removal_arcs？？

W13675308408

man里：Recovery or removal timing arcs impose constraints on asynchronous pins
       of  sequential  cells.  Typically, recovery time specifies the time the
       inactive edge of the asynchronous signal has to arrive before the clos-
       ing  edge  of  the clock. Removal time specifies the length of time the
       active phase of the asynchronous signal has to be held after the  clos-
       ing edge of clock.
       To  enable  compile,  report_timing,  and  report_constraint  to accept
       recovery or removal arcs specified in the  library,  set  enable_recov-
       ery_removal_arcs to true.对于上面timing arcs如何理解？这句话是用在异步时序cell?Recovery or removal timing arcs 到底是什么东西，求大神解释

kopzinc

recovery和removal是指带复位的寄存器的setup和hold。个人理解啊

W13675308408

回复 2# kopzinc


    哦哦，这样啊

ljjbunny

就是检查removal和recovery啊

W13675308408

回复 4# ljjbunny


    我不懂什么叫做recovery_removal啊，那是什么东西，上楼的有个人回答的你看看她说的行吗?

icfbicfb

通常是true，

ljjbunny

回复 5# W13675308408


    和setup hold类似，可以理解成复位端的setup和hold

muzilinvkouyue

The
recovery time
is the minimum time that an asynchronous input is stable after being de-asserted before the next active clock edge.

The
removal time
is the minimum time after an active clock edge
that the asynchronous pin must remain active before it can be de-asserted.

file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/ksohtml/wps24A.tmp.png

abao123

应该true，有vio可以问问电路

AveryYoung

如果你reset有效的时候，clk还在翻转，那就是true了。