Stats

  • Locked Locked
  • Replies 7
  • Subscribers 90
  • Views 14509
  • 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

2 questions, 1for cdump file and 1for CeltIC

archive

Hi ALL:

I have 2 questions:

1. I try to use readgds command to read GDSII file as cdump file, and then using cdump2lef covert cdump to LEF, I got stucked and found that the cdump file is correct, but the generated LEF is wrong.......is cdump2lef having bugs? I am using SOCE52USR3.

2. When I am running CeltIC, I find the 'set_parm gtol' parameter, this gtol means the filter criteria for aggressors, means glitch tolerance. But I also find 'set_thresh -glitch_peak' can also set such criteria, gtol default is 5% of VDD and glitch_peak is 20% of VDD, what is the difference? Can anybody tell me?

thank!


Originally posted in cdnusers.org by eminemshow
Parents

  • Posted By eminemshow on 1/30/2008 5:42 PM
    Posted By trishak on 1/30/2008 11:05 AM
    Hi eminemshow,

    For #2:

    gtol is the glitch tolerance of a single attacker. This variable to
    used to determine if an attacker can be an individual attacker or if it
    should be grouped into the virtual attacker.

    -glitch_peak is applied to the combined effect of all the attackers on a
    net. If all the attackers that can attack can create more than the
    glitch_peak value amount of noise, then the net is analyzed in more
    detail for glitch. When a net is analyzed in more detail, it means that
    the distributed RCs are used as well as a receiver peak analysis may
    happen.

    thank you,

    Trisha
    Glitch tolerance is the criteria for a single aggressor, glitch peak is for total effects of multi aggressors. Will CeltIC ignore the effect of multi aggressors on delta delay (and glitch) at all if their total glitch is below '-glitch_peak'? or just dont make a detail analysis and make a rough calculation instead? Hopes that my points are clear. This is very important for make a correlation between CeltIC and PT.



    I need the answer, really!


    Originally posted in cdnusers.org by eminemshow
Reply

  • Posted By eminemshow on 1/30/2008 5:42 PM
    Posted By trishak on 1/30/2008 11:05 AM
    Hi eminemshow,

    For #2:

    gtol is the glitch tolerance of a single attacker. This variable to
    used to determine if an attacker can be an individual attacker or if it
    should be grouped into the virtual attacker.

    -glitch_peak is applied to the combined effect of all the attackers on a
    net. If all the attackers that can attack can create more than the
    glitch_peak value amount of noise, then the net is analyzed in more
    detail for glitch. When a net is analyzed in more detail, it means that
    the distributed RCs are used as well as a receiver peak analysis may
    happen.

    thank you,

    Trisha
    Glitch tolerance is the criteria for a single aggressor, glitch peak is for total effects of multi aggressors. Will CeltIC ignore the effect of multi aggressors on delta delay (and glitch) at all if their total glitch is below '-glitch_peak'? or just dont make a detail analysis and make a rough calculation instead? Hopes that my points are clear. This is very important for make a correlation between CeltIC and PT.



    I need the answer, really!


    Originally posted in cdnusers.org by eminemshow
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.