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[DC] why use Total Negative Slack (TNS)

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davyzhu

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tns total negative slack

Hi all,

In book "Advanced.ASIC.Chip.Synthesis", it is said that Synopsys use TNS(Total Negative Slack) instead of WNS(Worst Negative Slack).

And TNS is the summation of all the Negative Slack of the top critical path. But when I read the report, if the critical path is very long, how can I know the sub critical path. And what's the beneficial of using TNS for our DC user (not for DC's algorithm)?

Best regards,
Davy
 

worst negative slack

DC is always working to reduce WNS (Worst Negative Slack) . if you specify critical range than it will work only on +/- critical range value.
 

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    davyzhu

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negative slack

So, do you mean we prefer WNS than TNS? Or TNS is just used in synthesis algorithm but not synthesis scripts?

Best regards,
Davy
 

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