Synopsys - SolvNet - DOW Retrieve
https://solvnet.synopsys.com/...ve/G-2012.06/ptug/ptuga_05_advtechniques.html?otSearchResultSrc=advSearch&otSearchResultNumber=1&otPageNum=1#BGEBEBAJ[2012/8/10 10:33:36]
For better accuracy, PrimeTime adjusts this amount further for the effects of clock latency, clock uncertainty, and clock
reconvergence pessimism removal.
Clock latency can be defined with the set_clock_latency command or calculated by PrimeTime from propagated delays in the
clock tree (enabled by set_propagated_clock). Latency values can be different for the rising and falling edges of the clock pulse,
which can affect the pulse width and thus the maximum borrow time. See Figure 19-4.
Figure 19-4 Maximum Borrow Time Adjustment for Latency
Clock uncertainty can be defined with the set_clock_uncertainty command. For a setup check, PrimeTime considers the earliest
possible arrival of capture clock edges. Differences in uncertainty between rising and falling edges can affect the clock pulse width
and maximum borrow time. See Figure 19-5.
Figure 19-5 Maximum Borrow Time Adjustment for Uncertainty