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Is irregular shape LEF possible?

atwork

I have questions about typical LEF generation. 

1. If using virtuso (leftOut) to generate a LEF for top verilog netlist, does it need some modifications for class, site etc?

2. Can the LEF size be irregular? eg, like a L  or U shape.

3. If this particular macro has corner cells, and IO cells included, how to definte them in LEF? Or is it necessary?  Can IO assignemnt file handle a block like this? Any special work? I cannot find useful information from user guide.

Any suggestions welcome ! Thank you.

 

Parents

  •  Hi,

    1. I would suggest you to use Abstract Generator in order to set and generate correctly your abstract. If you would liek to do it by hand yes you need to set the class and the type but teh way top do it depends on the Virtuoso version (CDBA/OA)

    2.  You can have a reactilinear prBoundary for your block, a layer OVERLAP describes the piece of teh block which could be covered by other blocks.

    3. Not sure about this part. I woudl suggest to create a BLOCK type of abstract and to place it by hand.

     Thanks,

    Alex

     

     

Reply

  •  Hi,

    1. I would suggest you to use Abstract Generator in order to set and generate correctly your abstract. If you would liek to do it by hand yes you need to set the class and the type but teh way top do it depends on the Virtuoso version (CDBA/OA)

    2.  You can have a reactilinear prBoundary for your block, a layer OVERLAP describes the piece of teh block which could be covered by other blocks.

    3. Not sure about this part. I woudl suggest to create a BLOCK type of abstract and to place it by hand.

     Thanks,

    Alex

     

     

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