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[Voltus] set_pg_library_mode command option -power_pins?

JonathanGu

Hi,

im using voltus for power grid view generation, what does the "-power_pins" option inside the set_pg_library_mode command do exactly? 

for example,

set_pg_library_mode \

    -celltype macros  \

    -extraction_tech_file <dir> \

     -power_pins { vdd 1.98 }\ ... 

is the voltage value 1.98 here for vdd important? by default, it will be set to 1.2, so i guess it is not important to set it to correct value or when i don't know what value to set it to?

thanks in advance

  • it is important to set it to the right value. You should know what your voltage is for the design, or the voltage that will be on those pins.

  • if my design has 3 different corners, vdd corresponds to 1.6/1.8/1.98 volt, does that mean i need to also run 3 times power grid view generation every time with power_pins vdd set to those 3 different corner voltage values?

  • You need to generate power-grid views for the PVT/corner that you plan to run power analysis in. So for example, if you plan to run your IR-drop analysis in ss_0p81v_125c (just an example, your PVTs seem different), then you would create the power grid views with voltage of 0.81v. If you plan to run EM analysis in ff_0p99v_125c, then you would need a set of power-grid views created with voltage set to 0.99v.

  • Hai,

    Am using Innovous 15.2 version.

    How can i generate Power grid library files. ?

    Can you suggest the input files required for generation ?

    Is it necessary to import design as LEF files .

    How can I get LEF for my macros, VDD, rings as in RAK. ?

    Please help me .

    Thanks
    Srinath B
  • in reply to Srinath VLSI

    See the Power Grid Library Generation chapter in the Voltus User Guide. Commands should work in Innovus.

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