Stats

  • Replies 1
  • Subscribers 64
  • Views 12843
  • Members are here 0
More Content

Tech Tip: How to Achieve Min. Wirebonding Constraints

archive

Scenario: I want to wirebond my design with a Bondfinger to Bondfinger spacing of 25 microns.  I open the design, go to: Route > Wirebond > Settings > View/Edit Constraints and set Finger to Finger at 25 microns and then disable all the rest of the selections (they are set to the default value of 75 microns) in both the Fingers and Wires tabs.
Then when I wirebond my first row and check the finger to finger spacing, it is much more than the 25 microns set in the constraints. Why?


Tech Tip: If you have different constraint values in this database for finger-wire and wire-wire, even though they are turned OFF, you either need to go into setup->user preferences->wirebond and turn on "wirebond_ignore_disabled_cns" or else change those other constraints values down to the point where they will not impact spacing.  
By default, turning off a constraint just stops the DRC checks from running. The bonder still tries to use those values unless you tell it that it can ignore them.

 


Originally posted in cdnusers.org by jgallag
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.