Stats

  • Locked Locked
  • Replies 2
  • Subscribers 143
  • Views 3134
  • 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

Changing bBox of cell using dbTransformBBox/geTransformUserBBox

egolowen

Hi,

I am trying to reduce the bBox of my cell (it has been enlarged and is much larger than my prBoundary) and I have tried the following commands:

cv_layout = dbOpenCellViewByType("lib" "cell" "layout_test" "maskLayout" "a")
transform = list(list(-10000 -10000) "R0" 1)
dbTransformBBox(cv_layout~>bBox transform)

When I go back and check cv_layout~>bBox, nothing has changed. Am I missing a step? Or is there a different way to change the bBox of an entire cell?

Thanks,
Elizabeth 

  • theopaone

     Sorry, you can't do that. The bBox of a cellView master is calculated as the bounding box of the contents. You may have some text or other stuff outside the prBoundary area.

    If you are looking to set the selection box for the instance to the prBoundary, you can create a rectangle on the "instance" layer (I forget the purpose) to whatever size you need it and it will become the selection box. For placement, you can also add the snapBoundary (IC6.1.x) to make it snap to the placement grid if the prBoundary is not correct.

    Ted

  • dmay

    Take a look at this post:

    /forums/p/14901/26010.aspx#26010

    For 6.1.x designs, I had to add the following two commands (to the function in the referenced post) to further help with errant bBoxes:

            mapcar('dbDeleteObject cv~>steiners)
            ;Delete markers that have isVisible set to nil (OA)
            mapcar('dbDeleteObject setof(x cv~>markers !x~>isVisible))

    Derek 

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.