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gf180: fix set_layer_rc resistance units, rules file values are ohm/nm not ohm/um - #4788

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AcKoucher:gf180-resistance
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AcKoucher:gf180-resistance

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@AcKoucher

@AcKoucher AcKoucher commented Nov 4, 2026 •

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When setRC.tcl resistance values were generated with the regression run, it still required a nanometer to micron conversion, because the gf180 RCX rules file shows resistance per nanometer and set_layer_rc reads its argument in the Liberty resistance unit per micron, which for gf180 is ohm per micron.

On the other public platforms the Liberty unit is kohm, so ohm per nanometer and kohm per micron are the same number and the missing conversion was invisible there.

…m not ohm/um

Signed-off-by: Arthur Koucher <arthurkoucher@precisioninno.com>

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Code Review

This pull request updates the resistance values for Metal2 through Metal5 in flow/platforms/gf180/setRC.tcl. As there were no review comments provided, I have no feedback to offer.

@AcKoucher

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@arthurjolo @jfgava FYI.

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🔍 QoR check

Metrics reflect the PR merge build — i.e. what will land on the target branch.

Commit 9404239 · Jenkins build #1 · Baseline: build · View build on dashboard

62 design(s) checked — 0 with regression(s), 0 without a comparable baseline.

@AcKoucher
AcKoucher requested a review from maliberty November 4, 2026 18:26
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@maliberty QoR is fine.

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