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

We have made the request with Cadence in a future release that you can assign a 
netname to a via. They have not agreed to it yet but it may appear in a future 
release. If the via is assigned a netname then it would keep that name in 
export subdrawing. We are asking for it to work with defining B/B vias in a 
pattern and then copy the pattern with it keeping the correct net names.

Diane.

________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
Sent: Monday, July 27, 2009 7:39 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem

Hi Ismail,
I did that and the planes retain their net names with no problem. But, the vias 
drop their net association.

Thanks for the reply,
Mark

ISMAIL wrote:
Hi Mark,

While Export-Subdrawing, goto the "options" tab in the control panel and check 
the "Preserve nets of shapes" is enabled.
Try , hope this helps.

Thanks,
Ismail.



________________________________
From: Mark Salberg <msalberg@xxxxxxxxxxxx><mailto:msalberg@xxxxxxxxxxxx>
To: Cadence User Group 
<icu-pcb-forum@xxxxxxxxxxxxx><mailto:icu-pcb-forum@xxxxxxxxxxxxx>
Sent: Monday, 27 July, 2009 6:33:42 PM
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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