• Skip to main content
  • Skip to search
  • Skip to footer
Cadence Home
  • This search text may be transcribed, used, stored, or accessed by our third-party service providers per our Cookie Policy and Privacy Policy.

  1. Community Forums
  2. Allegro X PCB Editor
  3. Constraint Manager Total Etch Length Green Box, Not Val...

Stats

  • State Not Answered
  • Replies 3
  • Subscribers 161
  • Views 10252
  • Members are here 0
More Content

Constraint Manager Total Etch Length Green Box, Not Value

jmadsen
jmadsen over 3 years ago

I'm using PCB Designer Professional, V17.4-027.  I have max total etch lengths set in the constraint manager.  Some traces show up as values, as they should.  This is good.  Some show up as green boxes; not as good.  A couple are definetly routed, but do not show up at all, such as USB2DM_UP, show below.  This is bad.  Why green boxes instead of values?  Why do some not show up at all?

  • Sign in to reply
  • Cancel
  • excellon1
    0 excellon1 over 3 years ago

    Hi

    Green box means the actual net is meeting the goal. So green box means those nets are 4000 mil in length. When you see numbers (Actual field) the system is telling you the current length of the net. The margin is the amount either plus or minus in order to meet the actual net length.

    It is usually a good idea to specify a minimum net length too.

    I had seen before the CM not turning to a green box even though the actual net length was met. It showed the correct length but would not update. Had to close the CM and re-launch it so it could read the values and update.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Verify Answer
    • Cancel
  • jmadsen
    0 jmadsen over 3 years ago

    After finishing the layout and trying to figure out what was going on, I found that I would only get actual values in the constraint manager if I modified the trace since the last time I opened the layout.  If I close the layout and re-open it, I get either a green box or nothing at all.  Green boxes indicate that the constraints are met.  I tried to find a way to get it to re-calculate and show a value without modifying a trace but could not.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Verify Answer
    • Cancel
  • steve
    0 steve over 3 years ago in reply to jmadsen

    You can select the netname and right click - Analyze which should update the values. This also works on Netclasses / groups or the complete design name.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Verify Answer
    • Cancel
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.

© 2025 Cadence Design Systems, Inc. All Rights Reserved.

  • Terms of Use
  • Privacy
  • Cookie Policy
  • US Trademarks
  • Do Not Sell or Share My Personal Information