Stats

  • Locked Locked
  • Replies 10
  • Subscribers 128
  • Views 5068
  • 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

connections to abstract not verified by Assura LVS - what's wrong?

TrevorB

Hi,

We are using an IP block from our foundry in our chip.  The IP block is located below the top level of the hierarchy.  And, the IP block is presented as an empty layout block, containing only pins and boundary shapes.

Currently, as we run Assura LVS with the default options, our outside connections to the IP block's pins are not verified. We can swap connections - even leave connections open - but LVS does not complain!  That's no good...

What do I need to do differently to make Assura LVS verify our connections to the IP block's pins?

Thanks!

Trevor

Parents
  • Hi Trevor

    This should not be happening. Assura will verfied connections and pins for blackboxes. If you check design.erc file in the lvs run directory, do you see pins being created for the ip block?

    Would you please provide the following info?
    a. Input layout type: gds2 or df2?
    b. Do pinLayer and pinText cmds exist in extract.rul file?
    c. Output of "assura -W" cmd in a terminal window

    Please see the section "Extracting Cells as Black Box Cells" in the Assura Developer's Guide for more info on blackbox methodology.
    linux>xpdf $ASSURAHOME/doc/assuradev/assuradev.pdf &

    Best regards
    Quek
Reply
  • Hi Trevor

    This should not be happening. Assura will verfied connections and pins for blackboxes. If you check design.erc file in the lvs run directory, do you see pins being created for the ip block?

    Would you please provide the following info?
    a. Input layout type: gds2 or df2?
    b. Do pinLayer and pinText cmds exist in extract.rul file?
    c. Output of "assura -W" cmd in a terminal window

    Please see the section "Extracting Cells as Black Box Cells" in the Assura Developer's Guide for more info on blackbox methodology.
    linux>xpdf $ASSURAHOME/doc/assuradev/assuradev.pdf &

    Best regards
    Quek
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.