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How to compute the bounding box of a cell in a hierarchical design

Renee

Hi,

 I had some problems with the placing pad head in a chip design. In the orignal design, all IOs have been placed without pad head. As there are so many pads in the design, I tried to realize this function by writing a program.

 Here are the functions it should have:

1. It should be able to identity positions of each IO.

2. It should be able to place pad head to the relative positon.

Here are my general thoughts to realize these function:

1. As there are identify layers covering IO, thus in order to locate them, I could locate bounding box of those ID layers, then I can have the lowerleft and upperight vertexes of IO. (But I have problems with getting bounding box of a cell in a hierarchical design)

2. How to place cell at a specific position in a design automatically?

 Thanks in advance!

Lei  

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  • lrl12skdev

     Hi Renee,

     I totally agree to Austin and about your question on what's the importance of getting the IO origin and transform, here is my idea behind that, First I would measure the displacement from the IO->xy to the Pad origin (where you want it to be placed) the IO-orient will give you the idea whether it is rotated, mirroredX or mirroredY etc. So for each instance of IO you will know how to add this relative displacement when placing the Pad head. Of course if you have several flavors of IO instances then you just need to build each case in your code.

    For mosaic, it is the same story, you can olso get the mosaic number of rows or columns and the origin where the master is located.

    BR  lrlsk

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  • lrl12skdev

     Hi Renee,

     I totally agree to Austin and about your question on what's the importance of getting the IO origin and transform, here is my idea behind that, First I would measure the displacement from the IO->xy to the Pad origin (where you want it to be placed) the IO-orient will give you the idea whether it is rotated, mirroredX or mirroredY etc. So for each instance of IO you will know how to add this relative displacement when placing the Pad head. Of course if you have several flavors of IO instances then you just need to build each case in your code.

    For mosaic, it is the same story, you can olso get the mosaic number of rows or columns and the origin where the master is located.

    BR  lrlsk

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