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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 Alex

    I believe the layout person is using IC6.1, and according to him, he only used lefOut wiithout any options.

    First I want to clarify with you. Are you talking about to use OA or to use LEF for SOCE?

    1.

    Personally I am looking at this abstract generator manual from support web. But I do not find it is useful to problem. From your reply, my impression is Virtuso can write out a LEF with proper syntax in it. Is this correct?

     2.

    I also looking at LEF/DEF language reference from support site but I cannot find syntax for prbounday. Is this for Virtuso?

    3.

    I am thinking to define macro as class pad. But I am not sure at this moment. I need to experiment.

    Do you have any documents or user guides for the related issues?

    Thanks 

Reply

  • Hi Alex

    I believe the layout person is using IC6.1, and according to him, he only used lefOut wiithout any options.

    First I want to clarify with you. Are you talking about to use OA or to use LEF for SOCE?

    1.

    Personally I am looking at this abstract generator manual from support web. But I do not find it is useful to problem. From your reply, my impression is Virtuso can write out a LEF with proper syntax in it. Is this correct?

     2.

    I also looking at LEF/DEF language reference from support site but I cannot find syntax for prbounday. Is this for Virtuso?

    3.

    I am thinking to define macro as class pad. But I am not sure at this moment. I need to experiment.

    Do you have any documents or user guides for the related issues?

    Thanks 

Children
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