ICC2 DRCs vs Calibre DRCs

[alishetti07]

Hi,

I have a design in which there are few DRCs(eg:50) showing in ReRoute(ICC2 too) log file but calibre DRC count is showing 80.
Can anyone please explain why the DRC count is different and why we are using Calibre as a signoff tool when we have an icc2?
And also please explain about DRC Dec


Thanks in advance

 

[ThisIsNotSam]

do not trust ICC, calibre is the golden signoff tool. it is that simple.

 

[alishetti07]

do not trust ICC, calibre is the golden signoff tool. it is that simple.

Hi,

I agree that Calibre is a signoff tool for DRC.

Just wanted to know what could be the exact reason for using Calibre when ICC itself is checking for DRCs.

 

[ThisIsNotSam]

because you trust one DRC tool, the one the foundry tells you to use. that is the definition of golden tool. all others are not as reliable.

 

[erikl]

alishetti07 asked: Can anyone please explain why the DRC count is different ...

Seems that calibre checks more design rules than icc2 does. You can't get a design in pre-production, if you can't show an error-free DRC with their compulsory golden DR checker with their own design rules. May be icc2 simply isn't able to check some complicated dependencies.

 

[ThisIsNotSam]

it is not that it does more per se, it is that it does better. you can have both false positives and false negatives from physical synthesis tools, which can be a mess to debug. Yet, whatever calibre returns as a drc, you believe it is one.