Default virtuoso layout bbox

Discussion in 'Cadence' started by West, Jan 27, 2006.

  1. West

    West Guest

    Does anyone know how to change or reset the default bounding box (bBox)
    of a layout cell.
    Currently when I change something in a cell e.g. I copy some part of
    the cell to a corner outside the current cell boundary for later use,
    then when I move that part back in, the bBox of the cell remains as
    though the part still existed. So when fiddling around in a cell the
    bBox tends to get bigger and bigger, but will never decrease. In the
    properties menu (Design->properties) I can only read the bBox, I cannot
    change it.

    Thanks in advance, Wim
    West, Jan 27, 2006
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  2. It sounds like an old issue caused by a system layer called
    changedLayer which is used for Diva's incremental DRC option.

    If you make this layer valid and visible and you see that layer
    causing your bigger bBox, just run a flat/full Diva DRC on the cell
    this will solve it, assuming your using Diva for DRC.
    You also can make this layer selectable and reshape it manualy.

    Bernd Fischer, Jan 27, 2006
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  3. West

    West Guest

    Hi Bernd,
    Thanks, this indeed solves my problem. We were using assura drc lately
    which apparently doesn't reset the bounding box. However with the
    chngLyr it is possible to remove the "artifacts" of
    fiddling around and get a nice bBox.

    West, Jan 29, 2006
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