Stats

  • Locked Locked
  • Replies 2
  • Subscribers 126
  • Views 11574
  • 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

Layout XL generating MOS without source contacts.

hesdeadJim

I am generating a layout using Connectivity>Generate>All_from_source using Cadence 6.18

This works very well only most of the sources do not have metal contacts and even when I instance a new nmos to add a dummy it has no metal contacts on the source. 

What do I have to do to get the source metal contact to show. There is not option for this in Properties/Parameters of the nmos.

So I'm guessing there is some option needed when generating from schematic Because normally when manually placing and not using 'Generate' the source does show when instancing.

  • This is something to do with the specific PDK you're using, and is impossible to answer generically (I've not seen that behaviour with any PDK I've ever used, so it does seem a bit strange). It suggests that something is rather wrong in either the PDK or in your environment.

    I would suggest contacting customer support - I think this will need looking at your environment to see what's going on, plus details of the PDK in use.

    Andrew

  • This looks like an outdated PDK from UMC. The pcells there do not work with virtuoso 6.1.6 and onward, so it might be necessary to either upgrade the PDK or to downgrade virtuoso, the former preferred over the latter if possible.

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.