[PCB_FORUM] Re: gnd plane and drc errors
- From: Kevin McCowan <kmccowan@xxxxxxxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Fri, 11 Jun 2004 10:20:28 -0400
I, also, have experienced this. It seems to happen generally where
2 vias are close enough that they create a sliver between them.
I have found that instead of changing the rules, which I do not
like to do, moving one of the vias a tiny bit resolves the
problem. The peculiar thing is even with the same two vias the
problem won't manifest itself on other plane layers. I put an
SR in on this and I hope that Cadence can find and fix this
annoying bug (or is it a feature?).
One other thing, since the difference is significantly less than
a mil, which will get lost in processing, you can safely ignore
these DRCs if you wish.
Hope this helps a little,
Kevin McCowan
Sr. PCB Designer
TSI Telsys
Gerry Meier wrote:
I have experienced the same thing - try adding a oversize value to the
clearance and it will take care of the problem. I think it's a rounding
error.
Set the clearance oversize to 1 mil or larger
Gerry Meier
Sr. PCB Designer
Freedom CAD Services, Inc.
Voice: (603) 864-1300 x1350
Alt. Voice: (386) 753-0048
Email: gerry.meier@xxxxxxxxxxxxxx
visit our website at<http://www.freedomcad.com
-----Original Message-----
From: sjcharles@xxxxxxx [mailto:sjcharles@xxxxxxx]
Sent: Thursday, June 10, 2004 9:27 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] gnd plane and drc errors
To all gurus:
I have multiple gnds (pwr,signal,earth and shield) and i need to edit all
layer, so i'll change all planes to dynamic shape and let program clear all
via that don't need to be tied. But i always get drc errors, rule says 8
mils but the opening is 7.99 mils. What gives? after i'm finish i change
shape type back to static and tie all the four types of gnds back together
around board edge. Why do i always get the 7.99 mils?
thanks in advance
Sam
-----------------------------------------------------------
To subscribe/unsubscribe:
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx
with a subject of subscribe or unsubscribe
To view the archives of this list please login at
//www.freelists.org. Our list name is icu-pcb-forum
or go to //www.freelists.org/archives/icu-pcb-forum/
Problems or Questions:
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx
Want to post a job listing ? DON'T DO IT HERE!
Better yet, join our jobs listing forum.
SUBSCRIBE: icu-jobs-forum-subscribe@xxxxxxxxxx
POST: icu-jobs-forum@xxxxxxxxxx
-----------------------------------------------------------
Other related posts:
