Stats

Locked Locked
Replies 5
Subscribers 167
Views 1909
Members are here 0

Laser Via - Buried Via

One of our layouts slipped through with a laser via on top of a buried via (fab house caught it). I don't understand why the system didn't flag it. We had BB via stagger set at 0.3837mm, and via-to-via spacing set at 0.1mm. I've been experimenting with the pad-pad connect settings, but unless I set it at 'All Allowed', I get tons of non-errors. It seems like it should be a simple setting issue, but what settings do I need that to edit to get it to flag a laser via on top of buried via? Thanks for any guidance.

aemeehan over 5 years ago

Sorry, meant to say "what setting do I need to edit to make the system flag a laser via on top of a buried via?" Thanks.
Cancel
Vote Up 0 Vote Down

Cancel
masamasa over 5 years ago

i assume you want to find the stacked via locations.

this skill code might help you.

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000006Ak17UAC&pageName=ArticleContent
Cancel
Vote Up 0 Vote Down

Cancel
redwire over 5 years ago

I had raised this issue on the forum around 9-12 months ago and never got a real answer. I was using 16.6 at the time and if the laser via was exactly on the same coordinate as the mechanical via it did not trigger a DRC no matter what setting I did. If it was off just by a small amount it would trigger so I suspect the software allows this since some fabricators are ok with zero offset.

All that said, the way I found was to run a via location extract and parse it in Excel for like coordinates...sigh. Which version and license level do you run? It might be a higher license level that can find this...
Cancel
Vote Up 0 Vote Down

Cancel
aemeehan over 5 years ago in reply to redwire

We're using 17.2 along with the high-speed/miniaturization option. I'm hoping there's a way to flag it with a DRC rather than any other option, but sounds like there may not be a way to do that. Thanks for responding redwire and masamasa.
Cancel
Vote Up 0 Vote Down

Cancel
redwire over 5 years ago in reply to aemeehan

Have you asked your VAR? Sometimes their apps guys know these tricks which escape even us power users. I would ask that if you do solve it, please post the solution for the rest of us. Happy hunting.
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.