We use Expedition EE7.9.5
Hi Karlheinz. I've moved your question to the Xpedition layout sub-community where it will have greater visibility to other Xpedition customers. Best regards, Cathy
I think this setting might only be useful if you have "Prevent Loops" set as a route control,
(I've had trouble placing extra vias with the "prevent loops" setting turned ON),
Also, in your DRC check, the extra via won't be flagged as a "hanger"
I suspect this is an old setting that is not very useful anymore,
now that we can do things like multiple thermal via grids buried into power pads, for example
regarding your question about "contradiction", I think it would be helpful to remember that the "one additional via" per pin was probably intended to allow the designer to make better power plane connections (more direct connection with two vias, and less inductance on device power pins and decoupling caps, filters, etc). Those type of nets aren't typically routed beyond the fan-out.
The other rule was probably intended to alert the designer if the router is trying too hard to complete a connection. For example, if you have a long two-pin net but the router is trying to use a dozen vias to accomplish it, you would want that route to be flagged.
I've never tried to put multiple fan-out vias on a pad that was going to get routed, but I would assume that the extra fan-out via WILL get counted as one of the routing vias. I could test if for you but I don't have Expedition loaded right now. I would bet a lunch on it, though