This is a thru via, not a BB via. We also specify all vias under BGA's be soldermask plugged. So we have a plugged via occupying the same space as a ball pad = no connection.Originally posted in cdnusers.org by padmaster
I have same net drc turned on and pad to pad direct connect set to not allowed.
First image: The via is touching the pad origin, I get no drc error.
Second image: The via is not touching the pad origin, it gives me a pad to via drc error.