[SI-LIST] Re: Allegro question.
- From: Jeff Seeger <jseeger@xxxxxxxxxxxxxx>
- To: Oleg.Kipnis@xxxxxxxxxx
- Date: Fri, 21 Jun 2002 15:43:05 -0400
"Kipnis, Oleg" wrote:
>
> Hello Allegro Gurus,
> On Allegro layout editor(v 13.5) is there way to adjust the LENGTH (not
> width) for
> thermal-relief clines(or spoke)?
> Thanks on advance.
Oleg,
This type of question is better suited to the Allegro User's
mail list, newsgroup comp.cad.cadence, the IPC Designer's
Council mail forum, or the PC Design Magazine mail forum.
The manual or Cadence hotline are even more likely to get you
a correct answer.
Since you asked here, the answer depends on whether you are
using positive or negative planes. If negative, the size in
question is controlled when you draw the image you want for
your thermal flash definition.
If positive, there is an environment variable:
set av_thermal_extend=<n> - documented in openbook
Controls the thermal relief clines generated during autovoid
processing.
By default, these clines connect from a pin to a location 5 mils inside
the shape. Use this to specify how far into the shape the clines will
extend. In cases where shape area between pins is less than 5 mils,
lowering the value to 2 or 3, will create a greater number of thermal
connections.
In addition: The value is based on the accuracy of the design. If the
database is mils with 1 level accuracy, and thermal clines should enter
the shape with an endpoint just 3 mils beyond the void edge, then set
the value to 30. An increase by a factor of 10 is required for each
level of accuracy.
Hope this helps,
--
Jeff Seeger Applied CAD Knowledge Inc
Chief Technical Officer Tyngsboro, MA 01879
jseeger "at" appliedcad "dot" com 978 649 9800
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