[PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem

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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