DRC Violations in Encounter

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inputoutput

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After running nanoroute in Encounter I get the following message

WARNING (NRDR-30) Detail routing is stopped because of too many drc violations
Click to expand...


The violations are due to spacing. During route I get the following warning, I don't know if it's a reason for the problem


I have done place and route for other designs using this same library without much problems. I don't think it's a congestion issue, as the density is only 30% or thereabouts.
Where to begin to solve this problem?
 

So many things could be wrong. I assume you are using nanorouter, correct? And it looks like the tech lef wasn't loaded correctly?
 

ThisIsNotSam said:
So many things could be wrong. I assume you are using nanorouter, correct? And it looks like the tech lef wasn't loaded correctly?
Click to expand...

Yes, the errors occur after nanoroute. But I now notice that the violations started after CTS. There are no violations after placement. Any ideas why CTS could be causing violations?
 

Did CTS start real routing of clock nets?
 

inputoutput said:
Yes, the errors occur after nanoroute. But I now notice that the violations started after CTS. There are no violations after placement. Any ideas why CTS could be causing violations?
Click to expand...

placement does no real routing, only a mock trial route. placement will never fail because of 'routing'

I bet your CTS is routing the clock tree already. that is one net and one net only, and you are already getting thousands of drcs. something is clearly wrong.
 

These violations are reported after CTS. Any idea what they could mean? Where do I begin?


There are more than 1000 of these violations.
 

inputoutput said:
These violations are reported after CTS. Any idea what they could mean? Where do I begin?



There are more than 1000 of these violations.
Click to expand...

There is always a pattern. You have to find it.
 

How are you checking the DRC errors? You can output a list that shows what kinds of DRC violations. Do that and post it here. Its under "verify geometry".
 

mwb said:
How are you checking the DRC errors? You can output a list that shows what kinds of DRC violations. Do that and post it here. Its under "verify geometry".
Click to expand...

Depends on tool version and technology being used. They should be in the violation browser, but the way to get them there changes from verify_geometry to verify_drc
 

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