[PCB_FORUM] Re: Disappearing Vias

Richard,

Yes, I've seen it in the past, but not lately.  Whenever I need
stitching vias, when I copy them, I use the "Retain net of vias" switch
(Options tab).

Intermittent problems are enough to make you scream!  Good luck.

Gary

 

  

Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado

amd.com

gary.macindoe@xxxxxxx

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of richard moffat
Sent: Sunday, May 20, 2007 9:38 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Disappearing Vias

 

Hello all

Allegro 15.7, Windoze XP.  We first saw this problem several years ago,
probably around 14.0 or 14.2.

Every so often Allegro would rip up stitching vias on planes, just
leaving one.  Needless to say, this is not a good thing.

 

It seems to be some 'gloss' function, but we never use it.  It's totally
random, although it always seems to be on outer layers.  We're lucky
this has never happened to a fab.  It's always been spotted by some
diligent CAD engineer before release.

 

We submitted this to Cadence a long time ago but we can't repeat it.  No
solution was offered.  Has anyone else ever seen this?

 

(Example attached, png file.)


Cheers,

Richard

 

  
__________________________
Richard Moffat
PCB CAD Team Leader
Allied Telesis Labs
ph. +64 (3) 3393000
richard.moffat@xxxxxxxxxxxxxxxxxxx


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