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Parentheses in Cell/Hierarchy Tree

bspbsp
edited October 2014 in KLayout Support
I'm using KLayout in viewer mode to look at a GDS file. My GDS has some cell names on the left hand window (hierarchy window) that have parenthesis around them and no '+' sign to expand them.

What do the parentheses signify? Missing cell?

Comments

  • MatthiasMatthias
    edited October 2014

    Hello,

    yes, the parenthesis indicates a cell is called but not part of the file. KLayout calls them "ghost cells". Lacking any information about those cells, KLayout cannot draw them. They will appear as tiny crosses when you select them. Apart from their location and orientation such cells do not carry information or contribute to mask layout.

    Files with such cells are often regarded invalid, but there are some applications which require such files. Hence the feature is supported, but I'd be cautious with that. Ghost cells can as well be the effect of a bug in the tool writing your file.

    Matthias

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