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Fixing DRC routing shorts in ICC

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die_hard

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I have rolled-in a ECO to fix timing in a slightly congested design. Before rolling-in the timing fix ECO the design was almost DRC route clean.

After rolling-in the ECO, I have about 100 routing shorts which are difficult to clean in ICC. I have tried deleting the nets and routing again but it didn't help.

Any other ways I can clean these shorts ?
 

You can try to play with the routing parameters, switching from timing oriented to congestion oriented. Since you have a 100 or so, that might not be enough. See if the errors are systematic in any way, i.e., always the same cell type or always the same block interface. If that is not the case redesign might be necessary.

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And one other thing: is your design already metal filled? You must tell the router it is ok to remove the fills if necessary.
 

As it's ECO flow, I am already routing with timing disabled. Redesign is not an option as the design is already at final stage.

Also I am trying to route after removing the fillers and metal fill.

Are there any other techniques or ICC commands I can try to clean these shorts ?
 

I can't think of anything that might help. Do you have tight constraints on EM that can be alleviated? That might save you some routing. Or if your clock signal has lots of shielding and double width maybe you can recover some of that. But this is all hypothetical.
 

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