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Simulating standard cells to calculate energy on a cell level

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Hello.

I have a bunch of standard cell libraries (design packages) from some IP vendors, and I want to compare my own standard cells with them in terms of energy efficiency.
The problem I face is that with the standard cell libraries, I am limited to the synthesis power and timing reports, which vastly differ from the energy and delay calculations I am making.

How do I go about comparing standard cells from IP vendors to the ones I have made, on a cell level?
Can I import some of the files from the design package to Virtuoso? I have access to the LEF and milkyway formats in the backend, and Celtic, composer, edif, fastscan, .lib, tetramax, and HDL models in the front end.

Thanks in advance

Karthik.


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