Stats

Locked Locked
Replies 2
Subscribers 164
Views 13247
Members are here 0

via on bga pad, no drc showing

I have a board that was layed out by a contract designer and apparently he routed a via at the center of several BGA pads but it never shows up as a drc error. I can aslo recreate this on other boards. I have same net drc turned on and pad to pad direct connect set to not allowed....but it never shows up as a drc error. Is this a known issue? Using SPB15.5.1

Originally posted in cdnusers.org by padmaster

archive over 17 years ago

You need to look at bb via separation. What is the issue anyway? Are you using filled vias or not? Via in pad on BGA *can* work if finished out correctly.

Originally posted in cdnusers.org by redwire
Cancel
Vote Up 0 Vote Down

Cancel
archive over 17 years ago

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.

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.

Originally posted in cdnusers.org by padmaster
- vianodrc.JPG
- View
- Hide
Cancel
Vote Up 0 Vote Down

Cancel

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.