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Importing standard cell area into .lib file automatically.

Barani7302

Hi,

I am working on a standard cell design. Once I do the characterization, I am noticing that the cell area = '0'. To avoid this, I am manually calculating the area of my cell and entering into the userdata.lib and read the same at the time of characterizing my cell.

When I go for a larger number of cells, how do I automate this?

OR

How do I read the area information from a lef file and write it to the userdata.lib automatically?

-Baranidharan

  • Hi Barabidharan,

    "area" attribute does not come from a simulation. You are right that a user data file can be used for such attributes.

    you can use write_user_data_library command to generate a user_data.lib file. This needs an existing Liberty file as a reference. Liberate does not read LEF files. You will have to create a Liberty file from a LEF yourself. Then in your write_library command, use -user_data option to specify the user_data.lib file. Liberate will add the attributes to your final library.

    Regards,

    guangjun 

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