Since CRPR is a more sophisticated and accurate
means
of
pessimism
removal,
the
user
should
disable
timing_early_launch_at_borrowing_latches when CRPR is enabled so that CRPR applies to all paths in the design. In this mode, note that
the
D-pin launch
time
is
not modified by the open edge CRP - since late launch
latency is used at the path startpoint, to additionally add
CRP
would
be
pessimistic, representing a "double-counting" of early-late differences.
就是说CRPR方式比较好比较准确,使用的时候要关闭timing_early_launch_at_borrowing_latches,保证所有path都照顾到。从 In this mode后面就没看懂,什么叫open edge CRP ?怎么就算两次计入了呢?