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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
  • 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
  • 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
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