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Library preparation for the MultiVT libraries

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Hi,

I wanted to work on the "MultiVT" libraries in my design, can any one suggest me how to go about this ?

1. In normal flow we will just import lib files, is it same in case multvt libs? if yes then how to differentiate?

2. how to diffrentiate HVT & RVT cells in the design (ie how to calculate the % of HVT & RVT cells)

3. what will be PD Flow(physical design steps)

Please suggest.

Thanks & Regards,
kulprashant


Originally posted in cdnusers.org by kulprashant05

  • Hi Kulprashant,

    You really don't have to do anything different. Just load in the .lib of both libraries. The cells should have different names, like INV and INVTH, or INV_HVT and INV_RVT, or something similar. I don't know of an automatic way to get the % of HVT vs RVT, but it should be easy to write a script to parse the netlist or a summary report file. As for the flow, it will be pretty much the same, but check the docs for setOptMode -leakagePowerEffort and set it to what you think is best for your design goals.

    Hope that helps,

    - Kari


    Originally posted in cdnusers.org by Kari

  • Along the same lines I have another query. I am trying to set up a multi vt flow as well.
    For my design, I have low VT and High Vt libraries.

    For setOpCond  and corner specification how do I specify multiple libraries? Currently multiple libs cannot be specified with setOpCond for max and min.

     
    LVT lib is called scmetro_cmos10lp_lvt_ss_1p08_125C.lib

    HVT lib is called scmetro_cmos10lp_hvt_ss_1p08_125C.lib

    Operating condition in both is called ss_1p08_125C

     
    Thanks and Regards,

    Sanjay Sunder


     



    Originally posted in cdnusers.org by ssunder@sioptical.com

  • Hi Sanjay,

    Just enter the setOptCond info for one library. The operating condition is the same, so it doesn't matter.

    - Kari


    Originally posted in cdnusers.org by Kari

  • Kari -

    Thanks!

    Sanjay


    Originally posted in cdnusers.org by ssunder@sioptical.com

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