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

I have had better success using negative plane layers. Also when copying
stitching vias have the retain net box checked.

 

Gerry Meier, Sr. PCB Designer

Freedom CAD Services. Inc

Voice: (256) 776-7470 or (603) 864-1350

Email:gerry.meier@xxxxxxxxxxxxxx

visit us at http://www.freedomcad.com

 

 

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Jean Bratton
Sent: Monday, July 27, 2009 10:59 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem

 

It never is...:-)

 

Jean Bratton

Senior PCB Designer

Freedom CAD Services, Inc.

Office: 603-864-1349

Email: jean.bratton@xxxxxxxxxxxxxx

Visit us at http://www.freedomcad.com

 

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
Sent: Monday, July 27, 2009 9:46 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [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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