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

Hi Diane,

Before import the subdrawing,  move all the power plane shapes outside the 
board.  Then you can pull back them into same location.

Regards
Ponraj.M
  ----- Original Message ----- 
  From: Dickoff, Diane J 
  To: icu-pcb-forum@xxxxxxxxxxxxx 
  Sent: Monday, July 27, 2009 11:27 PM
  Subject: [PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem


  We have thousands of these vias so that is why I don't like to use a net. 
Sometimes when we are doing this, we put a little shape inside the via and copy 
both.

   

  Diane.

   


------------------------------------------------------------------------------

  From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
  Sent: Monday, July 27, 2009 10:33 AM
  To: icu-pcb-forum@xxxxxxxxxxxxx
  Subject: [PCB_FORUM] Re: Allegro Sub drawing / Via stitch problem

   

  Sounds like a valid request. Anytime you have a via in a shape NOT connected 
to a pin / pad by a trace...seems to be able to take on different plane net 
names from time to time.

  For this problem, I simply route a trace inside the shape from pin to EACH 
via.

  Regards,
  Mark



  Dickoff, Diane J wrote: 

  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>
  To: Cadence User Group <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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