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DRA74x_hardware: HDMI IBIS model simulation

Dong Yang
Expert 5210 points

Dear expert 

Our customer use vayu_abc_IBISv1.3.4.zip to  run IBIS model simulation for HDMI.  They noticed no output from clock and data of HDMI interface as they select hdmi.  Is HDMI module available in IBIS v.1.3.4?  If yes,  what we need take carefully?  Customer was able to run other module in IBIS, such as DDR. 

Regards

Dong

  • 0
    TI__Expert 4885 points
    Hi, Dong,

    Your question has been forwarded to an HDMI expert.

    Regards,
    Mariya
  • 0 in reply to Mariya Petkova
    TI__Expert 5210 points
    Mariya
    Can you help to check with expert? I did not get answer for three days.

    Regards
    Dong
  • 0 in reply to Dong Yang
    TI__Guru 50932 points

    Dong,


    We do not recommend that the customer performs IBIS simulation for HDMI.  Instead, the customer should follow the Layout guidelines in the device Data Manual.  The layout guidelines have been derived based on extensive simulation by TI, along with extensive validation and will lead to the best implementation for the customer.

    Thanks,
    Kyle 

  • 0 in reply to kcastille
    TI__Expert 5210 points
    Kyle,
    Thanks for your response. customer was not sure they follow up the guidelines correctly. That's the reason they ask for IBIS simulation. What's the initial purpose for TI to put HDMI part in IBIS model? If we do NOT support HDMI , can we remove it? If it's HDMI model issue, Can we fix it?

    Regards
    Dong
  • 0 in reply to Dong Yang
    TI__Intellectual 1285 points
    Hi Dong,

    Still the advice from Hardware Applications Manager is:

    "HDMI layout requirements documented in the data manual need to be applied, and IBIS simulation of the DRA74x HDMI signals is neither recommended nor necessary when following the layout requirements."

    Best regards
    Lucy
  • 0 in reply to Lyudmila Kamenova
    Prodigy 25 points

    Hi Lucy,


    When I used AM572.ibs to simulate HDMI interface

    The simulation topology is shown in Fig.a, and simultion result at output is shown in Fig.b


    This output waveform is bad, is it the right waveform?

  • 0 in reply to Patty Lin
    TI__Guru 50932 points

    Patty,  It looks like the simulation is meeting the eye diagram requirements (not touching the pink polygon) so I interpret this as PASS.

    Nonetheless, we would not recommend performing IBIS simulation as stated above.  We plan to update the IBIS model to remove the HDMI models.

    We do not recommend that the customer performs IBIS simulation for HDMI.  Instead, the customer should follow the Layout guidelines in the device Data Manual.  The layout guidelines have been derived based on extensive simulation by TI, along with extensive validation and will lead to the best implementation for the customer.

    Regards
    Kyle

  • 0 in reply to kcastille
    Prodigy 25 points

    Hi Kyle,

    But this output waveform didn't inculde any channel characteristic, it's only IC characteristic.

    I want to confirm the output waveform is right. 

    If you plan to update the IBIS model to remove the HDMI models.

    Can you provide other formate model to us? ex. spice model for HDMI interface

     

    Thanks

    Patty

  • 0 in reply to Patty Lin
    TI__Guru 50932 points

    Patty, Sorry but we don't have any other model to provide for HDMI.  We recommend following the data manual routing guidelines, and if that is done then the HDMI eye diagram will meet the HDMI spec as stated in the DM.

    Regards
    Kyle