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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  

Parents
  • Renee
    Thanks!I took your advice and realize those functions, but I still want to optimize my program and here are my thoughts:As shown in the below schematic, IOs are placed on four sides of the chip. I wrote a case function to detect the orientation of each IO (R0, R90, R180, and R270), then calculate the displacement of each pad head (the red rectangle).

    I don’t know if there are better solutions than case function, since I have to use it twice to get the finally coordinates of pad head. The first time, I need to find the center point of IO and the second time I need to transform the center point of pad head according to the center point of IO.
Reply
  • Renee
    Thanks!I took your advice and realize those functions, but I still want to optimize my program and here are my thoughts:As shown in the below schematic, IOs are placed on four sides of the chip. I wrote a case function to detect the orientation of each IO (R0, R90, R180, and R270), then calculate the displacement of each pad head (the red rectangle).

    I don’t know if there are better solutions than case function, since I have to use it twice to get the finally coordinates of pad head. The first time, I need to find the center point of IO and the second time I need to transform the center point of pad head according to the center point of IO.
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