51tz

lvs.report PASS while lvs.report.ext has warning!

Discussion created by 51tz on May 31, 2012
Latest reply on May 31, 2012 by chris_balcom

Hi Guys,

 

The top cell passed the lvs check(port,net and instance) with a in "lvs.report". However, I found few warnings in "lvs.report.ext" as below:

 

WARNING: Invalid PATHCHK request "GROUND && ! POWER": no POWER nets present, operation aborted.

WARNING: Invalid PATHCHK request "POWER && ! GROUND": no POWER nets present, operation aborted.

WARNING: Invalid PATHCHK request "! POWER && ! GROUND": no POWER nets present, operation aborted.

 

I noted I did not label on power/gnd pad, but why it made top-cell lvs check pass consequently? I got confused!

 

To make use of the thread, should I lable each power/gnd pad or only one pair is enough since it is global net? Moreover, I found the power/gnd

pad have no top and top-1 metal, should I label on top-2 metal instead?

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