update gf180 layer resistance with segment-based regression results#4228
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eder-matheus merged 1 commit intoMay 13, 2026
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Signed-off-by: Arthur Koucher <arthurkoucher@precisioninno.com>
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This pull request updates the resistance values for Metal layers in the GF180 platform configuration and removes the file's descriptive header. Review feedback recommends restoring the header with specific details about the data source for better maintainability and correcting a slight inconsistency in the Metal4 resistance value to match the other identical metal layers.
eder-matheus
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May 13, 2026
eder-matheus
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The-OpenROAD-Project:master
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Correlation Data
Mode: segment
Designs (6): aes, aes-hybrid, ibex, jpeg, riscv32i, uart-blocks
OR Version: 390e0d62
Units: R [kΩ/μm], C [pF/μm]
The resistance values that we were using weren't actually precise. Probably something off with the net-based regression script. The resistance fits obtained with new segment-based regression have perfect (1.00) R².
I cleaned up the setRC.tcl script so that the data w.r.t. the correlation is tracked here rather than having comments in the file. I also removed the comments with redundant tech data.
Metal1 is not used for routing on gf180 so there's no data for that layer.