• 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. How to create a nested pcell but still maintain the strecth...

Stats

  • Locked Locked
  • Replies 4
  • Subscribers 143
  • Views 13743
  • 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

How to create a nested pcell but still maintain the strecth handle capacility?

kb how
kb how over 11 years ago

Hi,

How to create a nested pcell but still maintain the strecth handle capacility?

I'm developing a nested pcell which instantaite a native transistor pcell, and add some routing on top of it. But, this will disable the stretch handle that i previously build intransistor.Is there a way i can create a nested pcell and maintain it existing stretch handle capability?

 

Many thanks

 

 

  • Cancel
Parents
  • theopaone
    theopaone over 11 years ago

     I've never tried this so it is only a guess and I have no access to Virtuoso as I am on holiday.

    Stretch handles are handles on Rod objects, there is no way of creating a floating stretch handle. Stretch handles are in the master so they are one level of the hierarchy down from your design. You would have to duplicate the stretchable objects in the placed parameterized cell in the new master, either as pseudo objects (on non maskable layers) or copies of the the objects themselves and then apply the Rod handles and rodAssignHandleToParameter so when the new master is placed, the handles are available.

    When you create the pcell code, the value of the stretch handle parameter on the placed parameterized pcell is calculated from a parameter on the new master. The value of the parameter on the new master is determined by the stretching of stretch handle in the new master. When the handle is stretched, the new master parameter is calculated and the placed parameterized pcell parameter is updated as the the master is regenerated.

     Ted

     

    • Cancel
    • Vote Up 0 Vote Down
    • Cancel
Reply
  • theopaone
    theopaone over 11 years ago

     I've never tried this so it is only a guess and I have no access to Virtuoso as I am on holiday.

    Stretch handles are handles on Rod objects, there is no way of creating a floating stretch handle. Stretch handles are in the master so they are one level of the hierarchy down from your design. You would have to duplicate the stretchable objects in the placed parameterized cell in the new master, either as pseudo objects (on non maskable layers) or copies of the the objects themselves and then apply the Rod handles and rodAssignHandleToParameter so when the new master is placed, the handles are available.

    When you create the pcell code, the value of the stretch handle parameter on the placed parameterized pcell is calculated from a parameter on the new master. The value of the parameter on the new master is determined by the stretching of stretch handle in the new master. When the handle is stretched, the new master parameter is calculated and the placed parameterized pcell parameter is updated as the the master is regenerated.

     Ted

     

    • 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