Stats

  • Locked Locked
  • Replies 4
  • Subscribers 90
  • Views 14039
  • 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

Local congestion with 6.1*?

archive

Hi,

Anyone has seen bad local congestion with Encounter 6.1* after CTS? In my previous project, I had issue with this. In my current project which use a much larger process technology I am face with this issue again. I don't have this issue before with 5.*.

With the local congestion, optDesign is not able to size some of the cells, result in plenty of large negative slack.

Regards,
Eng Han


Originally posted in cdnusers.org by EngHan
Parents

  • I think i had seen the same problem in my design. I think the problem is with the new placement engine in 6.2 (default modulePlan). It tends to cluster cells much closer(for timing) than the old placement engine. You might want to try the same design/script but turn off the modulePlan placement engine (-noModulePlan?).

    li siang


    Originally posted in cdnusers.org by lisiang
Reply

  • I think i had seen the same problem in my design. I think the problem is with the new placement engine in 6.2 (default modulePlan). It tends to cluster cells much closer(for timing) than the old placement engine. You might want to try the same design/script but turn off the modulePlan placement engine (-noModulePlan?).

    li siang


    Originally posted in cdnusers.org by lisiang
Children
No Data

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.