In a GDS with multiple cells in parallel (no one topcell), how can I create a topcell

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majd229

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Hello,

I have a GDS (library of cells), where all cells are in parallel. There isn't a topcell.

For example, you'll see this hierarchy:
-cell1_horizontal
-cell1_vertical
-cell2
-cell3
...

What I want to do is, take all these cells and put them under 1 topcell so it looks like this:
-library_topcell
-cell1_horizontal​
-cell1_vertical​
-cell2​
-cell3​

How can I do that in CalibreDRV?

Thanks a lot!
 
Last edited:

Does your question refer to the GDSII file storage or to creating a hierarchical design in your layout tool?

As for the GDSII format: cells are stored one after another. There is no "top cell", but you can create a hierachical design by inserting cell instance references ("SREF") into other cells.
 

In the Calibre DESIGNrev reference manual (calbr_drv_ref.pdf in Calibre's docs directory), see the example in $L create cell -- it sounds similar to what you want.
 

I would just use calibredrv for this. very easy to create a hierarchy with scripting.
 

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