• 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. Custom IC Design
  3. Off-Grid pins warning in abstract generation

Stats

  • Locked Locked
  • Replies 3
  • Subscribers 125
  • Views 13725
  • Members are here 0
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

Off-Grid pins warning in abstract generation

affaq
affaq over 15 years ago

 Hello,

I am trying to generate abstract views using abtract generator version 5.10.41_USR5.90.69. I have placed pins on the intersection of M1 and M2 routing grids in layout design but still get warning stating there are no pins on M1-M2 routing grid. If I ignore this waring then I get pins placed at random positions which I dont want.

I have attached abstract log and snapshot of my cell to let you see whats wrong with it.

Thanks in advance!

Affaq

 

abstract.zip
  • Cancel
  • Alex Soyer
    Alex Soyer over 15 years ago

     Hello,

    How have you generated/displayed the routing ?

    You must bear in mind your cell origin should be on the placement grid and the placement grid starts from 0.0 and the routing grid have an offset from 0.0.

    I hope this help,

    Alex

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
  • affaq
    affaq over 15 years ago

     I have put cell origin on the placement grid already but the problem exists. You can view the attached snap to check if I took you right.

     

    Affaq

     

    • Origin snap.jpg
    • View
    • Hide
    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
  • Alex Soyer
    Alex Soyer over 15 years ago

    Hello,

    if I'm not mistaken most of the time the std cells are abutted and half of the power/ground rails overlapped together which means the origin should be at least at half of te rails.

    You must as well bear in mind the spacing between the boundary and the first metal layer is half of the min spacing of metal1.

    On the picture you sent us your  instance seem to be snapped to the routing and not to the placement grid.

    In order to help you to place your pins on the routing you could:

    - move the orign of your cell to be at coordinates x=0.14, y=0.14 (metal offset)

    - set your Xsnap Spacing and Y snap Spacing to 0.28 (metal pitch)

    - then move your pins

     

    I hope this help,

    Alex 

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel

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