• Skip to main content
  • Skip to search
  • Skip to footer
Cadence Home
  • This search text may be transcribed, used, stored, or accessed by our third-party service providers per our Cookie Policy and Privacy Policy.

  1. Community Forums
  2. Custom IC SKILL
  3. What's the difference between cellView~>prBoundary and cellView...

Stats

  • Locked Locked
  • Replies 8
  • Subscribers 143
  • Views 5225
  • 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

What's the difference between cellView~>prBoundary and cellView->shapes->lpp ?

Zelli
Zelli over 12 years ago

when lpp=list("prBoundary" "boundary") ?

 I mean, what's the cellView~>prBoundary supposed to do?

Thank you.

  • Cancel
Parents
  • skillUser
    skillUser over 12 years ago

     Hi Zelli,

    The prBoundary is the place & route boundary that instances and shapes should be placed within. The automated Place & Route tools will operate within the confines of this boundary. In IC51x and earlier the prBoundary was a shape on a specific layer-purpose pair (e.g. "prBoundary" "boundary" or "prBoundary" "drawing").

    cellView~>shapes~>lpp is something else entirely: in a cellview a shape exists on a specific layer-purpose pair, querying all the shapes of the cellview (cellView~>shapes) will obtain a list of all of the shape database objects, and further querying for the 'lpp' attribute will apply that query to each of the shapes (as long as you use the "~>" operator, not the "->" operator), so the compound query returns a list of the lpps, one for each shape. If you just want to see the lpps used in the cellview, do cellView~>lpps to obtain a list of the LP (layer-purpose) objects. The lpp query is not equivalent to the lpps query; the lpp attribute of a shape is a list of the layer and purpose, the lpps attribute of the cellview is a list of the LP db objects.

    Hopefully this answers your questions?

    Best regards,

    Lawrence.

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
Reply
  • skillUser
    skillUser over 12 years ago

     Hi Zelli,

    The prBoundary is the place & route boundary that instances and shapes should be placed within. The automated Place & Route tools will operate within the confines of this boundary. In IC51x and earlier the prBoundary was a shape on a specific layer-purpose pair (e.g. "prBoundary" "boundary" or "prBoundary" "drawing").

    cellView~>shapes~>lpp is something else entirely: in a cellview a shape exists on a specific layer-purpose pair, querying all the shapes of the cellview (cellView~>shapes) will obtain a list of all of the shape database objects, and further querying for the 'lpp' attribute will apply that query to each of the shapes (as long as you use the "~>" operator, not the "->" operator), so the compound query returns a list of the lpps, one for each shape. If you just want to see the lpps used in the cellview, do cellView~>lpps to obtain a list of the LP (layer-purpose) objects. The lpp query is not equivalent to the lpps query; the lpp attribute of a shape is a list of the layer and purpose, the lpps attribute of the cellview is a list of the LP db objects.

    Hopefully this answers your questions?

    Best regards,

    Lawrence.

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
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.

© 2025 Cadence Design Systems, Inc. All Rights Reserved.

  • Terms of Use
  • Privacy
  • Cookie Policy
  • US Trademarks
  • Do Not Sell or Share My Personal Information