• 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. (VCAR) How to route mosfet diffusion regions?

Stats

  • Locked Locked
  • Replies 1
  • Subscribers 125
  • Views 13165
  • 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

(VCAR) How to route mosfet diffusion regions?

mike207
mike207 over 16 years ago

 Hi all:

How can I make the VCAR route the transistor diffusion regions (S D) by automatically adding contacts and using metal 1 to finish the job instead of directly using diffusion layer as routing layer which is obviously wrong?

Thank you!

  • Cancel
  • tkhan
    tkhan over 16 years ago

    I found this to be very frustrating also, as the autorouter would do a lot of routing on poly and diffusion. The best solution I've come up with is to draw a poly_m1 autocontact at the end of gates or extend the m1 over diffusion manually then let the autorouter do its job. Of course this isn't convenient if you have a lot of transistors to route. I'm not familiar with writing the ruleset since my pdk came with a set of rules already, but you might want to look through /ICC/doc/iccausr/iccausr.pdf on how to write the rules yourself.

    • 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