[SI-LIST] Re: Allegro question.

"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
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: