[PCB_FORUM] Disappearing Vias

  • From: "richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx>
  • To: <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Mon, 21 May 2007 15:37:51 +1200

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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Attachment: dis_vias.png
Description: PNG image

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