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

Another way to find them is to highlight all nets in Black, only your vias that 
are “not on a net” will remain

 

Thanks,

Chris

 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Craig Lewis
Sent: Wednesday, July 29, 2009 6:38 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem

 

The cleanest way would be to write a short SKILL utility to find all vias on a 
dummy net inside that shape. The next easiest would be to select all via in the 
shape and do a Show Element on them, save the file to your favorite text editor 
and search for "not on a net."

Craig

Mark Salberg wrote: 

No, I just routed a trace (inside the shape) from a pin to the vias to force 
it...Then just export / import to 0,0.

Anyone know how to search for these "floating" vias? Danging via does not work. 
Would like to locate any instances  I may have missed.

Thanks,
Mark 

cadman10@xxxxxxxxxxx wrote: 

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,B 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> 
<mailto: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< /u> 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

         

         

        -----Origi nal 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 t race 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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