WebI see very different things in the destination clock path area of the two paths. In the first, non-exception case, the destination clock path delays include destination FD setup time, clock uncertainty, clock pessimism and the route the clock took up to the FD. In the second case with a set_max_delay exception, only the FD setup time is included. Webnet——BUFG——net这部分跑到了data path这部分就很奇怪(和图2无违例的时序报告对比) . . . 2、clock path skew不是一般建议300ps吗?为什么这条路径CPS这么大,却没有出现时序违例呢?是我哪里理解错了吗? . . 附件是时序报告,万分感谢!
clock skew和clock jitter,时钟短路径问题 - CSDN博客
WebJul 15, 2024 · 漫谈时序设计(3)走进时序约束的大门!. 【摘要】 目录 前言 Intra-Clock&Inter-Clock Paths 时序约束 主时钟约束 衍生时钟约束 延迟约束 伪路径约束 多周期路径约束 写在最后 前言 为了秋招,对时序分析做了一些准备,但主要是时序路径,建立时间裕量、保持时间 ... WebSep 4, 2024 · CTS是布局之后相当重要的一个步骤,如何评价一个时钟树的好坏,这个问题可以每个人心中都有不同的答案。. 通常各个公司已经约定俗成了一套评价时钟树的方法,我们也称为clock tree metrics。. 包括以下几点:时钟的传播延迟(Latency),时钟偏差(Skew),时钟 ... profiler shows
时序报告中的两点问题
WebClock Insertion Delay (Clock Tree Latency)最短. Clock tree越长,意味着clock tree级数越长,级数长了,tree上的power就越大。同时,受OCV效应影响,timing就越难meet。 造成Clock tree latency太长的原因有很多。有的是因为Constraint不合理导致的,有的是因为floorplan对CTS不友好导致的。 WebNov 15, 2024 · Capture Clock Latency = 10+10+10+10 = 40ps Launch Clock Latency = 10+10 = 20ps Local Skew = 40-20= +20ps. Global Skew: The clock latency difference between two non related flops or the difference between the longest clock path and the shortest clock path in the design is called global skew. Suppose, FF1 has the minimum … Web0-skew clock tree synthesis method0-skew clock tree synthesis method zIntegrate 0-skew clock tuning into each level CTS zBottom up hierarchical process: ~Cluster clock nodes and build a local tree by the load balance based CTS methods ~Create a buffered RC network from the local clock tree ~Minimize clock skew by wire sizing and snake … remitter software