Stats

  • Locked Locked
  • Replies 3
  • Subscribers 91
  • Views 14915
  • 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

how to fix transition on excluded net?

dota

In encounter, optDesign -drv can help us fix transition, but some nets are excluded. how to report those net? If I want to fix some transition on excluded net, how to do?

ps: sometimes optDesign -selectedNets can help me to fix some excluded net, but sometimes not.

 

Dota

Parents
  • BobD

    Thanks for the follow-up.

    As you work with these clock nets, it would be good to understand whether the nets in question clock nets from a timing perspective -or- from a CTS perspective.  The following blog post might be informative in this area:

    http://www.cadence.com/Community/blogs/di/archive/2008/08/20/understanding-clock-net-markings-in-soc-encounter.aspx?postID=10803

    There is a native command that is targeted at fixing the CTS clock nets that have DRVs remaining because they've been excluded (which happens most typically because of an ExcludePin statement in the clock tree spec file): "fixClockExcludedNetDRV".  I'm not sure whether it would be helpful in your case- it depends on why your nets are being excluded.

    It seems like reportIgnoredNets should report clock nets as being ignored.  I just tried a small testcase and I see some clock nets being caught:

    56 IO nets
    6 clock nets
    179 special nets
    1 no-driver net 

    There might be a bug in reportIgnoredNets in your case- though it is hard to tell for certain without looking at the data.  If you feel there is a bug, I'd encourage you to follow-up with your local support AE or by filing a service request on http://sourcelink.cadence.com.

    Great discussion!  Thanks for taking the time.

    Regards,
    Bob

     

Reply
  • BobD

    Thanks for the follow-up.

    As you work with these clock nets, it would be good to understand whether the nets in question clock nets from a timing perspective -or- from a CTS perspective.  The following blog post might be informative in this area:

    http://www.cadence.com/Community/blogs/di/archive/2008/08/20/understanding-clock-net-markings-in-soc-encounter.aspx?postID=10803

    There is a native command that is targeted at fixing the CTS clock nets that have DRVs remaining because they've been excluded (which happens most typically because of an ExcludePin statement in the clock tree spec file): "fixClockExcludedNetDRV".  I'm not sure whether it would be helpful in your case- it depends on why your nets are being excluded.

    It seems like reportIgnoredNets should report clock nets as being ignored.  I just tried a small testcase and I see some clock nets being caught:

    56 IO nets
    6 clock nets
    179 special nets
    1 no-driver net 

    There might be a bug in reportIgnoredNets in your case- though it is hard to tell for certain without looking at the data.  If you feel there is a bug, I'd encourage you to follow-up with your local support AE or by filing a service request on http://sourcelink.cadence.com.

    Great discussion!  Thanks for taking the time.

    Regards,
    Bob

     

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.