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

  • The glitch analysis and delta delay analysis criteria are separate. For delta delay analysis, you should use the set_thresh -delta_absolute command/option. This allows you to put a delta delay value as the criteria for the delta delay analysis. For instance, if you want to analyze all nets with delta delays larger than 5ps, then you would do: set_thresh -delta_absolute 5e-12. For glitch, using -glitch_peak is correct and any glitch less than -glitch_peak will not be analyzed in detail.

    You have a lot of very good questions about CeltIC. You might consider taking a CeltIC training class as these details are discussed in the CeltIC training class in more detail than can be easily written in this forum.

    thank you, Trisha


    Originally posted in cdnusers.org by trishak
Reply

  • The glitch analysis and delta delay analysis criteria are separate. For delta delay analysis, you should use the set_thresh -delta_absolute command/option. This allows you to put a delta delay value as the criteria for the delta delay analysis. For instance, if you want to analyze all nets with delta delays larger than 5ps, then you would do: set_thresh -delta_absolute 5e-12. For glitch, using -glitch_peak is correct and any glitch less than -glitch_peak will not be analyzed in detail.

    You have a lot of very good questions about CeltIC. You might consider taking a CeltIC training class as these details are discussed in the CeltIC training class in more detail than can be easily written in this forum.

    thank you, Trisha


    Originally posted in cdnusers.org by trishak
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.