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Problem with C6678 IBIS File

Richard Marsh
Intellectual 760 points
Other Parts Discussed in Thread: TMS320C6678

Hi,

I cannot use the C6678 IBIS file (tms320C6678_4_2_1_r1p5b.ibs) with HyperLynx 8.1.1.

When I try to select the model I get the following error message:

"Differential pin N1 is paired with a NC pin in component tms320c6678_4_2_1 of file tms320C6678_4_2_1_r1p5b.ibs"

It then says the "selected device is unusable".

 

Looking at the IBIS file, all serdes pins are set to NC including the MCM one on pin N1.  I assume this is because the IBIS file doesn't model these high-speed pins.  Yet I notice that pin N1 is also referenced lower down in the file saying it is a differential pin that is paired with M1, another NC.  Should this differential pairing be here.  If they're NC then they should be NC shouldn't they?

 

I don't actually want to model the serdes pins, but this error stops me from accessing any pins.  Anyone else got this to work with HyperLynx?

 

Richard

  • 0
    TI__Mastermind 42545 points

    Hi Richard,

    The SERDES pins are listed as NC in the IBIS model because they are simulated with AMI models.  The AMI simulation models require an NDA and are not available on TI.COM presently.  Contact your TI FAE to get those models for your SERDES simulations.  Is the error your seeing caused by the [Diff_pin] statement for the SERDES pins?  This was not flagged by the IBIS checker that we're using but since these pins are listed as NC in the model you could comment out the [Diff_pin] statements for the SERDES pins and try again.  Let me know if that removes the error. 

  • 0 in reply to Bill Taboada
    Intellectual 760 points

    0143.tms320C6678_4_2_1_r1p5b_edit.txt

    Hi Bill,

     

    Yes, if I delete the [Diff_pin] entries for the serdes pins then everything is okay.

    Please see the attached file for my edits.  Note I have changed the extension to enable uploading. IBS files are blocked on the upload.

     

    Cheers,

     

    Richard

  • 0 in reply to Richard Marsh
    TI__Mastermind 42545 points

    Hi Richard,

    I'll run the IBIS checker again to see if it flags those pins.  They don't need to be defined as differential so I'll comment out the [Diff_pin] entries for the SERDES pins in the next release of the IBIS file.  Thanks for the update.

    Bill