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Re-characterizing a tap-less cell library (Cadence Liberate)

anurans

Hi All,

I want to re-characterize the existing library to a lower supply voltage. I have been provided the extracted (with parasitics) netlist (.cir) of this tap-less cell library by the vendor. 

> I generated the cell template file from existing .lib in .tcl format which contains cell definitions, delay/power templates with slew/load indices.

> The provided netlist however contains the VBN/VBP contact ports (along with its parasitics) which are not available in generated template (I assume the earlier characterization was done by connecting well contacts to the supply rails accordingly / or atleast that's what I'd do if I create a lib for my custom made cells).

> In this condition, re-characterization is not possible as Liberate does not see VBN/VBP in cell definitions of the template. Is it possible to indicate "Liberate" that those well contacts should be connected globally to respective supply rails during the characterization ?

> When doing the characterization, are those slew values for the given loads automatically re-calculated for the new supply voltage ?

Thanks

Anuradha

Parents
  • anurans

    Can anybody shed some light please ? Am I in the right forum ?

    Anuradha

  • Andrew Beckett
    in reply to anurans

    This is the wrong forum. It should be in the Custom IC Design forum (perhaps not obvious, but that's where Liberate questions are practically answered). Unfortunately whilst I'm a moderate, I don't have the ability to moderate in this forum for some reason so I can't move your post.

    Regards,

    Andrew

  • anurans
    in reply to Andrew Beckett

    Hi, I originally made the post in digital design, somehow it was moved to this forum (by a moderator?). Will make a new post in Custom IC Design.......

    Anuradha

Reply
  • anurans
    in reply to Andrew Beckett

    Hi, I originally made the post in digital design, somehow it was moved to this forum (by a moderator?). Will make a new post in Custom IC Design.......

    Anuradha

Children
  • Andrew Beckett
    in reply to anurans

    Now it's in the Custom IC Design forum. I guess somebody moved it!

    Andrew

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