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What is the best way to stream out a cellview that contains pcell instance

richardyuan

When I stream out the cellview that contains pcell install, i usually set the options with "Convert Pcells to Geometry" and "Convert Paths to Polygons" checked.

But after streaming out and streaming in,  the shapes didn't keep the related positions to the others as in the orginial cellview. 

I tried another way:

1. Flatten the pcell instance in the cellview first.

2. Merge the shape in same layer (will break the shape into pieces).

3. Stream out and stream in.

Now the shapes stand their positions well, though broken into pieces.

I don't like to flat the pcell instance, as it is convenient to save parameters in the cellview. 

Is there a better way to stream out? 

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  • richardyuan

    Hi tweeks,

    I think i got some clues.

    The outer ring becomes polygon with fewer edges after stream-out/stream-in, changing its distance to the marked shape at the connection.. 

    The outer ring is created by dbCreateDonut. I change the conic sides from 20 to 300 at "Layout Editor", then convert the ring to polygon. When stream-out/stream-in, the marked place looks normal now.

     Now I have another question, does the "conic sides" has any relationship with the layout grid? What is the recommended "conic sides" if the grid resolution is set to 0.01?

Reply
  • richardyuan

    Hi tweeks,

    I think i got some clues.

    The outer ring becomes polygon with fewer edges after stream-out/stream-in, changing its distance to the marked shape at the connection.. 

    The outer ring is created by dbCreateDonut. I change the conic sides from 20 to 300 at "Layout Editor", then convert the ring to polygon. When stream-out/stream-in, the marked place looks normal now.

     Now I have another question, does the "conic sides" has any relationship with the layout grid? What is the recommended "conic sides" if the grid resolution is set to 0.01?

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