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Xilinx' encrypted HPICE models in PSPICE

Discussion in 'Electronic Design' started by Melanie Nasic, Dec 15, 2005.

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  1. Hi community,

    I got a problem you might be able to assist me in solving. I downloaded
    several HSPICE models for the Xilinx Virtex-II Pro FPGAs from the Xilinx
    homepage. They are stored in a format I don't know: *.inc. The included
    readme-file says that all models are encrypted and must be used in Synopsys
    HSPICE. All I got is a free PSPICE version running that supports file
    formats like *.opj, *.dsn, *.sch, *.olb, *.lib, *.vhd, *.txt. I already
    generated several schematics with PSPICE which I want to test in combination
    with the Xilinx models. Unfortunately it looks like that is not possible at
    all. Has anyone of you made similar experiences or has a hint how to solve
    that incompatibility problem? Any help is highly appreciated.

    Regards, Melanie Nasic
  2. Jim Thompson

    Jim Thompson Guest

    Welcome to the wonderful world of HSpice dominating the simulator
    world... because management equates high price with high performance

    While PSpice CAN read some encrypted models, I _believe_ it can't read
    HSpice versions.

    Charlie Edmondson ??

    Melanie, I suspect that you're a student, so you have no leverage. If
    you're at a company simply have your purchasing department declare
    Xilinx as "Do not purchase".

    I did that once to Motorola... gets their attention real quick ;-)

    ...Jim Thompson
  3. Austin Lesea

    Austin Lesea Guest


    In order to protect the sub-circuit models for our foundries
    (proprietary to the fabricators of our devices), we are not allowed to
    distribute the spice files in unencrypted form. We also do not want to
    tell the world how we designed all of our circuits (protect our own
    intellectual property).

    This practice is typical of the entire semiconductor industry.

    Instead, I suggest you use the IBIS models which are also available for use.

  4. Hi Melanie,
    Sorry, but you are out of luck. Due to some interesting 'legal'
    constraints, PSpice can't read the HSpice encrypted models, and very few
    manufacturers have yet gone to using the PSpice encrypted models, either.

    Also, you will probably be unable to use the IBIS models either, as the
    translators makes too large of files for the student version.

    What you end up doing is making some reasonable guesses from the
    datasheets as to the drive and loads, and creating your own models,
    either as an LRC with a current/voltage driver, or as a behavioral.
    Best, of course, would be a digital I/O model, but that requires some
    speciallized knowledge and skills that only a very few have taken the
    time to master. I know, because I am NOT one of them!


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