I'm trying to re-extract a design in sky130 using ...
# openroadm
Matthew Guthaus
06/09/2023, 8:24 PMI'm trying to re-extract a design in sky130 using OpenRCX. I'm roughly following this example for my design:
https://github.com/The-OpenROAD-Project/OpenRCX/blob/master/calibration/script/ext_patterns.tcl
However, I'm using this rule file:
Copy code
/OpenLane/pdks/sky130B/libs.tech/openlane/rules.openrcx.sky130B.nom.spef_extractor Copy code
>>> extract_parasitics -ext_model_file /OpenLane/pdks/sky130B/libs.tech/openlane/rules.openrcx.sky130B.nom.spef_extractor \
... -cc_model 12 -max_res 0 -context_depth 10 \
... -coupling_threshold 0.1
[INFO RCX-0008] extracting parasitics of user_project_wrapper ...
[INFO RCX-0435] Reading extraction model file rules.openrcx.sky130A.nom.spef_extractor ...
[ERROR RCX-0487] No RC model read from the extraction model! Ensure the right extRules file is used!
[ERROR GUI-0070] RCX-0487Matthew Guthaus
06/09/2023, 8:45 PMIt seems that I'm using the correct file:
https://github.com/The-OpenROAD-Project/OpenLane/discussions/1477
Matthew Guthaus
06/09/2023, 8:45 PM@Tim Edwards Do you know the answer to this?
t
Tim Edwards
06/09/2023, 9:00 PMI generally use the scripts found at https://gitlab.com/efabless/skywater/openrcx-calibration.calibre. (edited for use with magic or spef_extractor).
The command you gave is found in
scripts/extract_patterns.tclpatterns.defextract_parasiticsTim Edwards
06/09/2023, 9:01 PMGenerally, I trust the rules derived from magic over the rules derived from spef_extractor. The spef_extractor is quite primitive and misses a lot of coupling cases.
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Matthew Guthaus
06/09/2023, 9:54 PMI'm running this on my old MPW2 design so I've read in a DEF file already but not their example. I think I have a timing violation in my own scan chain and wanted to use updated extraction values.
Matthew Guthaus
06/09/2023, 10:37 PMAhh, I figured it out. There's actually another script that sets the R and C values of layers and vias. I thought that was in the model itself. And, I think the example was only setting the values for vias, not the actual metal layers.
Matthew Guthaus
06/09/2023, 11:07 PMAnd it's showing a hold problem in the nominal corner even with the too relaxed SRAM lib models
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Matt Liberty
06/12/2023, 5:40 PMSome is odd with the command using rules.openrcx.sky130B.nom.spef_extractor but the error saying rules.openrcx.sky130A.nom.spef_extractor
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