Stats

  • Locked Locked
  • Replies 4
  • Subscribers 91
  • Views 14032
  • 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

Nanoroute problem

amrzahir
I've a strange problem here, I'm using First Encounter to layout a digital design (about 300K standard cells design), targeting IBM 0.13u technology. What happens is after placement and Clock tree synthesis I use Nanoroute engine for routing, and then use timing optimization to meet time constraints. After running the optimization the results is excellent. But when I run timing analysis alone it gives a slack far from what results from the timing optimization ! I just want to know what is the problem. I doubt about the technology files but I need help please. BTW, I used wroute before with 0.35u technology and this didn't happen. Thanks
Parents
  • amrzahir
    Thanks for your reply. I actually use (optDesign -postRoute) and yes what happens is exactly as you said. I need to know what is the difference between these two commands: 1) reportTA. 2) timeDesign. as the problem occurs with (reportTA) command, but when I used (timeDesign -postRoute) no slacks appeared. By the way, I make timing analysis from GUI (timing->timing analysis) and these are the results: After optDesign: (Worst Slack: -0.412ns) After timing analysis: (Worst negative slacks=-2.803) Sorry for long reply
Reply
  • amrzahir
    Thanks for your reply. I actually use (optDesign -postRoute) and yes what happens is exactly as you said. I need to know what is the difference between these two commands: 1) reportTA. 2) timeDesign. as the problem occurs with (reportTA) command, but when I used (timeDesign -postRoute) no slacks appeared. By the way, I make timing analysis from GUI (timing->timing analysis) and these are the results: After optDesign: (Worst Slack: -0.412ns) After timing analysis: (Worst negative slacks=-2.803) Sorry for long reply
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.