Stats

  • Locked Locked
  • Replies 2
  • Subscribers 125
  • Views 13632
  • 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

Is VSR auto routing placement dependent ?

San

Hi all,

I am using VSR auto routing for my layout. While some of my cells where placed apart , VSR auto route did not connect all nets as in schematic.

But when I placed those cells in different formation (closer) then VSR auto route routed all nets as expected.

Why do I see this kind of behaviour ? Should not VSR connect all nets as in schematic ? is there any setting I should apply before routing to eliminate this ? I am using 6.1.6

Thanks

Sanket

  • ColinSutlieff

    Hi Sanket,

    There is no reason why VSR could not route your design just because they were placed farther apart.

    But there are some settings that may help.

    The design style setting can have an effect. The default is "device level". If you have a larger design you may want to try "ASIC" or "chip assembly".

    It all depends on what your design contains; physically large with a few macro blocks or a design containing thousands of standard cells, or a few transistors.

    You have not shared enough details to enable me to provide more feedback.

    Colin

  • San

    Hi colin , I tried to debug and yes you are right it was not placement dependency. Instead "Routebility" option in verify-> design was unchecked. When I checked it, it worked as expected. Thanks for help. I appriciate it.

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.