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CDC586 IBIS Model Issues

Leslie L. Cramer
Prodigy 55 points

When I use the IBIS model for the CDC586 in my simulation, I am not getting a clock waveform at all. Can someone check the IBIS Model?

  • 0
    TI__Intellectual 2140 points

    Hi Leslie,

    I was able to duplicate the issue. The problem is the model was generated ~15 years ago and we don’t have a history of how the model was generated. The model might not  be of the highest quality.

    Anyway, I modified the file/VT table that has an excessive amount of delay that isn’t necessary and seems to be causing this issue.

    Please give the attached IBIS file a try and let us know how it goes.

    Regards,

    -Eric Kim (WEBENCH Design Center)cdc586.ibs

  • 0 in reply to Eric Kim- DSS
    TI__Prodigy 55 points

    Thank you for the update. However it is not working for me. The engineer has now changed his termination scheme to have an R/C at the target device with the source termination changed to 0 ohm. The simulation result that I’m getting does not look like a clock. I tried different resistor/capacitor values but the plot always look like the one below with slight change. Please have someone look into the model again?

  • 0 in reply to Leslie L. Cramer
    TI__Prodigy 55 points
    Please disregard. The engineer was able to resolve his issue.