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I figured it out. You can query for differential pairs using Differential Pair Classes, and there is even a default class for all differential pairs. You can make custom class groups as needed. (Design->Classes in the PCB editor. "Differential Pair Classes" list)
Create a Clearance rule with...
I'm trying to figure out how to make a rule in Altium that specifies the clearance between any differential pair line and any polygon plane. I want to set the 20 mil space between trace edge and plane edge specified for PCI-E signals. The problem is that I can't figure out how to make a query...
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