When the conventional method of defining sequential element timing parameters is used in conjunction with the conventional method of accounting for clock uncertainty in timing analysis, the results are overly pessimistic because, when clock uncertainty is nonzero, the element can never be simultaneously ...
Figure 1 below shows the generic diagram for clock jitter: Please note that the uncertainty in clock edge can be for both positive as well as negativeedges(above example showed only for positive edges). So, there are both full cycle and half cycle jitters. By convention, clock jitter implies...
Aclocksource(sayPLL)issupposedtoprovideaclockoffrequency10MHz,amountingtoaclockperiodof100ns.Ifitwasanidealclocksource,thesuccessiverisingedgeswouldcomeat0ns,100ns,200ns,300nsandsoon.However,since,thePLLisanon-idealclocksource,itwillhavesomeuncertaintyinproducingedges.Itmayproduceedgesat0ns,99.9ns,201nsetc....
The uncertainty in the phase relationships becomes negligible because the phase difference is in the master clock, not the data clock. As far as the data is concerned, the correct clock edge to bring in the data occurs more or less in the middle of the data bit. This is also the reason...
Clock skew and delay are limiting factors in high-speed logic circuits and become more severe as chip size increases. Clock skew is the maximum time difference between the active clock edges for any two clocked elements. Clock skew is viewed as an uncertainty on the position of the active ...
There are a variety of sources of delay uncertainty in high speed integrated circuits [11]. Effects such as the nonuniformity of the interconnect lines and interlevel dielectric variations introduce...E. G. Friedman (Ed.), High Performance Clock DistributionNetworks, Norwell, Massachusetts: Kluwer ...
Due to the large number of clock drivers in pro- cessors and digital systems, substantial power consumption occurs, accounting for 10–30% of overall chip power consumption6–9 and causing on-chip thermal problems. As each clock driver adds timing uncertainty, jitter (random variation in clock...
因为是检查数据传输得不能太快,所以对于hold来,Arrival... + Tck2q+Tdp - Capture Edge - network latency -Thold- uncertainty 需要注意的是Hold 检查是在当前时钟沿下,所以对hold来说,Data
Characterization of the Uncertainty of Divergence Time Estimation under Relaxed Molecular Clock Models Using Multiple Loci Genetic sequence data provide information about the distances between species or branch lengths in a phylogeny, but not about the absolute divergence times... T Zhu,DR Mario,Z Yang...
networks may have to traverse through longer distances. Furthermore, on-chip variation will become more considerable in terms of clock uncertainty and latency. It makes the timing closure become a tough job. For example, the timing sign off criteria under TSMC 65nm low-power design is as ...