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TFP40x/50x HDMI Audio Problems?

Robert Petrilak
Prodigy 30 points
Other Parts Discussed in Thread: TFP401A, TFP401, TFP501, TFP403

I have read several posts here on the forum that indicate that if HDMI audio is present in the TMDS datastream, it will cause the TFP401A to output incorrect sync information.  We seem to be experiencing exactly this issue when connected to video cards (plus their driver) that have HDMI audio.

Do any of the DVI receivers in the TI portfolio (TFP401, TFP401A, TFP403, TFP501) handle the presence of HDMI audio properly (ignore it completely) and output correct & stable H, V, and DE signals?  If not, is there any workaround available from TI or that anyone might know about?  Our application is video-only so we do not need to preserve any embedded audio.

Best regards,

Rob P

  • 0
    TI__Guru* 76130 points
    Hello,
    There is no workaround.
    Unfortunately we don't have more DVI receivers in this group.
    The best workaround would be that your graphics controller don't send the audio over HDMI as you don't need it anyway.
    You can also post a question at the below link where they may have more HDMI receivers.
    Regards
    e2e.ti.com/.../high_speed_interface
  • 0
    TI__Guru* 76130 points
    Hello,
    We may have a solution, can you use the TFP401, it has the same pinout than the "A" version.

    The TFP401A incorporates additional circuitry to create a stable HSYNC from DVI transmitters that introduce undesirable jitter on the transmitted HSYNC signal.
    Regards
  • 0 in reply to Elias Villegas M.
    Prodigy 30 points

    Thanks for your replies Elias.  We don't have any control over the graphics controllers feeding our units, they are graphics cards installed in end-user PC's.

    With the TFP401, are you saying that it doesn't exhibit the same problems with HDMI audio?  We had been using the 401 in this product but changed to the 401A a few years ago.  We still have some of the older units with the 401's that we've been testing, but they seem to have the same problems.

  • 0 in reply to Robert Petrilak
    TI__Guru* 76130 points
    It is not that the TFP401A have some issues, but it has some additional circuitry for jitter tolerance, (it was a dded to support some old Sil devices that had jitter problems)

    If you are getting the same failure with the TFP401 then we should look for a noise problem, have you changed your design recently?
    Can you tell the lot codes of the failing devices? Is this a 100% failure rate? If not, can you swap a passing unit with a failing unit to see if the failure follows the part?
    Does it happens the same with different pixel clock or resolutions?

    Regards
  • 0
    Prodigy 20 points

    Hi,

    I've the same problem with the presence of audio signal in the HDMI data stream.

    The Input is fix and there is no way to switch of the audio part.

    The video resolution is 1080p with audio.

    Do you found a solution / workaround?

    Thank you very much,

    Best regards,

    Ric