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大家好,
我正在使用Vivado 2017.1 / 2为KU115实现一个复杂的设计,并且我会不时地得到轻微的负面松弛(> -0.1ns)。 用2017.1检查runme.log,我注意到路由中的最后一个“中间时序摘要”有一个0.029ns的正余量,所以路由器将停止,但是“后路由时序摘要”报告负的松弛-0.106ns并发布 路由物理优化无法修复它。 我知道中间时序摘要不会100%准确,但我希望它更加悲观,以便路由器将花费更多精力来满足时序要求。 我使用的路由策略是Explore。 中间时序摘要来自“阶段6.1保持修复Iter”,但摘要中也没有保持违规。 我也尝试2017.2一个实现,它符合时间。 但是,中间时序摘要再次优于后置路由,0.038 ns VS 0.011 ns。 所以我认为路由器仍然有可能提前停止,这将导致路由后的负面松弛。 这是预期的吗? 如果是的话,解决它的方法是什么? 谢谢, 吉米 以上来自于谷歌翻译 以下为原文 Hi All, I am implementing a complex design for KU115 with Vivado 2017.1/2 and from time to time I will get slightly negative slack (> -0.1ns). Checking the runme.log with 2017.1, I noticed that the last "Intermediate Timing Summary" in routing has a positive slack of 0.029ns so the router will stop, but the "Post Route Timing Summary" reports negative slack of -0.106ns and post route physical optimisation can not fix it. I understand that the intermediate timing summary will not be 100% accurate, but I am expecting it to be more pessimistic so that the router will spend more effort to meet timing. The routing strategy I am using is Explore. The Intermediate Timing Summary is from "Phase 6.1 Hold Fix Iter", but there is no hold violation in the summary either. I also try 2017.2 for one implementation and it meets timing. However, again the intermediate timing summary is better than the post route, 0.038 ns VS 0.011 ns. So I think there is still a chance that the router will stop earlier than it should, which will result in negative slack after routing. Is this expected? If yes, what's the method to work around it? Thanks, Jimmy |
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嗨,
我也看到在“Post Router Timing”为0.024的实现中,但最终的时序报告是-0.082。 有问题的路径与复位信号有关,并连接为:FDRE / Q - > BUFG - >逆变器 - > FDRE / R. 如果这对你有意义,请告诉我。 谢谢, 吉米 以上来自于谷歌翻译 以下为原文 Hi, I am also seeing in an implementation where "Post Router Timing" is 0.024, but the final timing report is -0.082. The problematic paths are related to a reset signal and is connected as: FDRE/Q -> BUFG -> inverter -> FDRE/R. Please let me know if this mean anything to you. Thanks, Jimmy |
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