[PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem
- From: "Jean Bratton" <jean.bratton@xxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Mon, 27 Jul 2009 06:08:17 -0700
IF all of your stitching vias are to GND, then you can move all of your
non-GND positive planes off-board before reading in the clip. Then the
unconnected vias will get associated with GND, and then you can move the
other planes back on the board.
Jean Bratton
Senior PCB Designer
Freedom CAD Services, Inc.
Office: 603-864-1349
Email: jean.bratton@xxxxxxxxxxxxxx
Visit us at http://www.freedomcad.com
-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
Sent: Monday, July 27, 2009 9:04 AM
To: Cadence User Group
Subject: [PCB_FORUM] Allegro Sub drawing / Via stitch problem
Hello all,
When Exporting a Sub-Drawing I found that any vias in a shape used for
stitching...connected to a shape, but has no traces to a pin...looses
connectivity and sometimes connect to a different plane after import
sub-drawing.
The only way I have found to fix it is to ALSO route a trace from a pin
to the via to force the connection.
Is there a way to locate any occurrences of this prior to exporting a
Sub-Drawing?
Thought maybe dangling wire reporting as dangling via...but a Dangling
via is defined a a via with only one connection from a pin. These vias
simply dropped in a shape for thermal reasons do not get flagged.
Any thoughts as to how to find them in a design?
Thanks,
Mark
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