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旅游网站开发报告,网站源码平台,网站建设书 模板下载,私人装修接单网站在Innovus中place_opt_design和optDesign阶段，我们经常会看到如下所示的log提示信息，核心关键词是“ Reasons for remaining drv violations”。而且告诉我们总共有819条net存在drv violation，且无法被工具优化掉。 Reasons for remaining dr…

在Innovus中place_opt_design和optDesign阶段，我们经常会看到如下所示的log提示信息，核心关键词是“ Reasons for remaining drv violations”。而且告诉我们总共有819条net存在drv violation，且无法被工具优化掉。

=======================================================================
Reasons for remaining drv violations

*info: Total 819 net(s) have violations which can’t be fixed by DRV optimization.

MultiBuffering failure reasons

*info: 233 net(s): Could not be fixed because the solution degraded timing.
*info: 5 net(s): Could not be fixed because the location check has rejected the overall buffering solution.
*info: 477 net(s): Could not be fixed because term is inside don’t touch hierarchy.
*info: 3 net(s): Could not be fixed because of hinst,location,fence/region mismatch.
*info: 100 net(s): Could not be fixed because of exceeding max local density.

DRV主要就是指max transition，max fanout,max capacitiance这些指标。这里面的指标我们主要关心max transition。我们知道解决transition的主要方法有upsize driver和插buffer两大方法。

因此，这里也会报告出当前DRV无法被fix的原因。但是细心的同学就发现，工具并没有给出这些有DRV violation的net 名字。

我们可以在placement之前设置如下mode即可让工具报出这类net的名字。

Legacy UI ： setOptMode -verbose true

CUI: set_db opt_verbose

我们还可以通过下面的mode设置让工具报告出drv无法修复的详细原因。

Legacy UI : setOptMode -detailDrvFailureReason true
Common UI : set_db opt_detail_drv_failure_reason true

默认情况工具只会输出50条net。我们还可以通过下面的mode设置报告出更多有DRV Violation的net信息。

Legacy UI : setOptMode -detailDrvFailureReasonMaxNumNets 1000 
Common UI : set_db opt_detail_drv_failure_reason_max_num_nets 1000


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