In STA, the worst (smallest) slack among all paths. Together with TNS (total negative slack), the sum of negative slack over violating endpoints, it indicates how large and how widespread the timing violations are.
Japanese name: WNS(ワーストネガティブスラック)
WNS (worst negative slack) appears in 1 practice question across 1 topic, including Timing analysis and CDC.
Field: Timing analysis and CDC
Answer: B. WNS is the worst slack value and TNS is the sum of the negative slacks
WNS (Worst Negative Slack) is the worst slack among all paths and indicates how far the frequency can be raised. TNS (Total Negative Slack) is the sum of the negative slacks of the violating path endpoints. For example, with three endpoints at −0.1 ns, WNS is −0.1 ns and TNS is −0.3 ns. Even if the magnitude of WNS is small, a large TNS magnitude means many paths need fixing. The number of violations is reported by a separate metric, and WNS and TNS are computed for setup and for hold separately.
WNS (Worst Negative Slack) is the worst slack among all paths and indicates how far the frequency can be raised.
Which correctly describes WNS and TNS as they appear in STA…As an Amazon Associate I earn from qualifying purchases.
STA (static timing analysis) Slack Asynchronous FIFO Clock domain Clock uncertainty Critical path CRPR (clock reconvergence pessimism removal) False path Handshake MTBF (mean time between failures)