Stats

  • Locked Locked
  • Replies 2
  • Subscribers 91
  • Views 13954
  • 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

DRC violation after trial routing

Greatrebel

 Hi all,

I am designing P&R for a digital chip. After trial routing, I got thousands of DRC violations, most of which are M1 to M1 violations and happen in standard cells. The thing is that after trial routing, Via between M1 and M2 are generated. Those Vias have a small portion of M1 which break the spacing design rule to other M1 wire in standard cells. It seems like the orientation of Via M1 causes some violations. They are all horizontal.

Can anyone tell me how to fix those violations which are still there after Nanorouting. and how to change the orientation of Via.

Thanks in advance

  • Hi,

    Trial routing is dirty routing that typically used for estimation. So, DRC violations are expected. But if they still exist after Nanorouting (I mean the same violations) you need to check that dirty routing is deleted by NanoRoute before performing actual global/detail phase. Use editDelete -type Signal to delete all signal wires before NanoRoute. Please notice that clock wires will be deleted too. You can deselect it from deletion by using editSelect/editDeselect commands.

  •  Hi mikhail,

     

    Thank you very much for your help.  After cleaning all signals created by trial routing and re-runing Nano routing, those voilations were gone.

    Thanks a lot

     

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.