• 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. Digital Implementation
  3. Assistance with Followpin Connection to Power Ring

Stats

  • Locked Locked
  • Replies 2
  • Subscribers 92
  • Views 2829
  • 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

Assistance with Followpin Connection to Power Ring

Anas2023a95
Anas2023a95 9 months ago

Dear All,

As shown in the image below, some followpins (in blue) fail to connect to the power ring. This appears to be because the horizontal tracks connecting the power pad on the right to the power ring extend to the outermost ring instead of terminating at the nearest one.

I believe the DRC violation can be resolved by instructing the tool to connect the power pads to the nearest rings (on the right side). This would allow the followpins to connect to the left-side rings.

I’m currently using the following command for routing:

route_special -connect {block_pin pad_pin pad_ring core_pin floating_stripe} -layer_change_range { M1(1) AP(8) } -block_pin_target {nearest_target} -pad_pin_port_connect {all_port one_geom} -pad_pin_target {nearest_target} -core_pin_target {first_after_row_end} -floating_stripe_target {block_ring pad_ring ring stripe ring_pin block_pin followpin} -allow_jogging 1 -crossover_via_layer_range { M1(1) AP(8) } -nets { VDD VSS } -allow_layer_change 1 -block_pin use_lef -target_via_layer_range { M1(1) AP(8) }


Could you please advise on what changes are needed to achieve this? I’ve experimented with various options but haven’t found a solution.

Many thanks,
Anas

  • Cancel
  • DimoM
    DimoM 9 months ago

    Hi Anas,

    it seems like your attachment upload failed. Can you try to attach the photo again ?

    - Dimo

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
  • DimoM
    DimoM 9 months ago

    Hi,
    I just saw the picture in the other thread.
    It seems that you are using wire groups for the rings.

    I would suggest to divide the problem into two separate routing tasks - connect pad to rings, then connect followpins to rings.
    You can use the route_special command switches to achieve that.


    Also you probably want to connect all shapes in the group to the pad ports.  This article might be relevant for your problem:

    How to use sroute to connect macro pins to the nearest ring or wire group stripes

    - Dimo

    • 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