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Cadence Allegro, how to fix impedance mismatch

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shemo

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In constraint manager I set the value for impedance and make all nets close to certain tolerances. Then I it auto route and have bunch of impedance mismatch DRCs

1)I thought its constraint driven tool, so it should have routed within the tolerance of impedance I specified.

2)How to fix impedance mismatch. I try delay tuning, it didn't work. It just adds more delay.
 

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