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Via span to rule area

Question asked by matsk on Mar 25, 2020

I am doing a flex design with 16 layers and from the main rigid section there are 3 flexes on top of each other which requires 3 different via spans 1-7, 10-16 and through. To make it easier for the manufacturer I want to have all vias in the main rigid to be through vias, but as soon the transition goes within the shorter spans the tool chooses a short span via.

To avoid this a want to create a rule area for via span to be only through in the main_rigid, how do I do that? I have created a scheme that I applied to the rule area but the only thing I can change is the Net Class Via which is default for all my vias!