Hello Mark,
Normaly this happens becouse when the vias do not have a net association they inherit the net name of the first shape they find, Have you tried to disable the dynamic shapes on the board first , then import your subdrawing, then enable the dynamic shapes and force your imported shape to update first
good luck
cadman
On Jul 27, 2009, Mark Salberg <msalberg@xxxxxxxxxxxx> wrote:
Not quite that easy Jean,
Actually stitching to many different power supplies on 8 different layers.
Just want to keep the import the same as the export.
Importing clip all at once by 0,0 origin.
Jean Bratton wrote: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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