Stats

  • Locked Locked
  • Replies 10
  • Subscribers 166
  • Views 16132
  • Members are here 0
More Content
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

redundant constraints

Lock2002

Is there any way to delete redundant  spacing constraints in Allegro? They are all repeated with the exception of same to same, eg, Thru Pin to Thru Via and Thru Via to Thru Pin. They can also have different values, which doesn't make any sense. I assume it uses the smallest value.

Parents
  • steve

    Try a Tools - Database Check, there is an option to purge unused constraints

  • Lock2002
    in reply to steve

    that doesn't resolve the redundant constraint issue.

  • steve
    in reply to Lock2002

    Can you post a screenshot of CM to clarify what you are trying to remove?

  • redwire
    in reply to Lock2002

    You didn't screen-grab the whole screen so I am guessing you are looking at the nets spacing vs the top-level spacing rules.  Nets can be overridden and inherit the top level constraints or as shown in the far left column you can apply a specific constraint definition instead of "DEFAULT".   If this is not the nets spacing display then please post a full screen-shot.

Reply
  • redwire
    in reply to Lock2002

    You didn't screen-grab the whole screen so I am guessing you are looking at the nets spacing vs the top-level spacing rules.  Nets can be overridden and inherit the top level constraints or as shown in the far left column you can apply a specific constraint definition instead of "DEFAULT".   If this is not the nets spacing display then please post a full screen-shot.

Children
  • Lock2002
    in reply to redwire

    No, I'm looking at the 2 highlighted columns. "Line to Thru-pin" and Thru-pin to Line". By the time you get to the "Bond Finger" group of constraints all of the constraints have already been listed in the previous group with the exception of "Bond Finger to Bond Finger". 

  • Lock2002
    in reply to Lock2002

    It's probably only a gripe that can be resolved by Cadence changing their software. 

Cadence Guidelines

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.