OpenROAD-flow-scripts icon indicating copy to clipboard operation
OpenROAD-flow-scripts copied to clipboard
verified publisher icon The-OpenROAD-Project

Add net voltages to enable IR drop analysis for GF180

Open openroad-robot opened this issue 1 year ago • 4 comments

openroad-robot avatar Jul 09 '24 15:07 openroad-robot

@habibayassin this should give the IR drop metrics once merged.

maliberty avatar Jul 09 '24 15:07 maliberty

@habibayassin this should give the IR drop metrics once merged.

perfect thank you

habibayassin avatar Jul 09 '24 16:07 habibayassin

So, is it currently not possible to perform IR drop analysis on the GF180 process? Because I tried running analyze_power_grid, but I always encounter the error THE MATRIX IS STRUCTURALLY SINGULAR ... ZERO COLUMN AT xxx. This seems to be an issue with Eigen, and a solution is provided here: Eigen Bug Report. Reinstalling Eigen and then recompiling OpenROAD might solve this problem, but I am not sure. Are other PDKs working fine? I have tried nangate45, it seems to have no problems

b224hisl avatar Oct 24 '24 13:10 b224hisl

I don't see that error in the results for this PR. There are some cases where the pdn seems disconnected and I haven't had a chance to dig into them. If you can provide a test case for your singular matrix issue please open an issue.

maliberty avatar Oct 24 '24 15:10 maliberty