Tapeout: False(?) DRC violations on 45-degree wires - 90-degree turns
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Special Wire of Net VDD
Type: Non-sufficient Metal Overlap
bbox = (4272.335, 2483.208) (4273.235, 2484.108)
45-degree routing happily uses 45-degree wires to round off manhattan turns, as I suppose it should. However, if the 45-degree wire is too short, the two manhattan wires overlap and cause a DRC error (see figures).
I believe this is a false error, please let me know if you disagree. Also, let me know if you have a good way of preventing these false errors in the first place e.g. I suppose it wouldn't be too hard to manually delete the 45-degree wire and extend the other two wires so it lookl like a normal manhattan turn.
My plan is to flag these as false violations for now, so we can keep the existing flow. Later maybe Caliber will tell whether this is a real violation or not.
This bend caused no violation:
This bend caused trouble:
