定时报告中的定时错误

时序报告显示的内容取决于为时序分析器设置的选项。
它可能显示您应用于设计的每个时序约束的前3-10个故障。
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以下为原文

What the timing report is showing is dependent on what options were set for the Timing Analyzer.  It is likely showing the top 3-10 failures for each timing constraint that you applied to your design.
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嗨Zied，
欢迎来到Xilinx论坛。
以下是分析的发生方式
1）您在UCF中给出PERIOD约束
2）实现工具努力放置和路由逻辑以满足PERIOD约束中提到的时序。
3）然而，为了满足cetain路径的时序，可以忽略一些路径，这可能在设计中带来定时误差。
4）时间报告只不过是一份关于实施如何满足时机的报告。
因此，该工具将最终实现的时序与给定的时序约束进行比较，并基于报告松弛（正面或负面）。
5）报告显示的时钟周期为8ns，是此发生运行的时钟周期，可以帮助满足时序要求。
6）您可以尝试将PERIOD约束时钟更改为8ns，并检查是否仍然出现时序错误。
简而言之，检查您的设计是否在硬件上运行良好的最重要的事情是编写良好的时序约束（基于您的设计要求）并进行操作以满足该时序。
信息太多但希望它能帮助您更好地理解该工具。
干杯
谢谢，AnirudhPS：请将此标记作为答案，以防它有助于解决您的问题。如果帖子引导您找到解决方案，请给予赞誉。



以下为原文

Hi Zied,
 
Welcome to Xilinx forums.
 
Here is how the analysis happens
 
1) You give PERIOD constraints in the UCF
2) The implementation tool tried hard to place and route the logic to meet the timing mentioned in the PERIOD constraint.
3) However to meet timing for cetain path, some paths can be neglected which can bring timing errors in the design.
4) The timing report is nothing but a report of how the implementation worked to meet the timing. Hence the tool compares the final implemented timing with the timing constraints given and based on that reports the slack(postive or negative).
5) The clock period 8ns which the report shows is the clock period for this impelementation run which can help meet the timing.
6) You can try changing your PERIOD constraint clock to 8ns and check if you are still getting timing errors.
 
In brief, the most important thing to check if your design works well in hardware is to write good timing constraints(based on your design requirements) and do manipulations to meet that timing.
 
Too much information but hope it helps you understand the tool better.
 
Cheers
Thanks,
Anirudh

PS: Please MARK this as an answer in case it helped resolve your query.Give kudos in case the post guided you to a solution.