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DS90UB929-Q1EVM: HDMI source format

Piero Yu
Intellectual 950 points
Part Number: DS90UB929-Q1EVM
Other Parts Discussed in Thread: ALP

My ctm design DS90UB926 to get the FPD-LINK signal. They want to get the RGB888 and pass it to the DSP. To debug DS90UB926, they bought a DS90UB929 EVB to get the LVDS source to pass to DS90UB926.

So the signal chain is  HDMI->LVDS->LVDS->RGB888.

Ctm can use ALP(software) to config DS90UB929 EVB.

If ctm use the 929EVB to generate a test patten, their 926 can get the right signal. Everything is OK.

But if through HDMI, turn off the test patten, 926 can only get the hsync, Vsync, Pclk. But all data is 0.

What's the problem? Is it caused by the HDMI source? if the HDMI source can't auto fit from EDID, which  720P format should be selected?

Pls kindly help, thanks.

  • 0
    TI__Mastermind 30515 points

    Hi Piero,

    for the hs/vs timing, is it correct?

    can you check the UB929's 0x5a? the hdmi input is correct? thanks.

    best regards,

    Steven

  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 30 points

    0x5a:value is 0xdd(1101 1101)

    pls check the LEDs light and config

    HDMI and FPD status as below

  • 0 in reply to Steven(Shenzhen) Shi
    Intellectual 950 points

    Dear Steven,

    The hs/vs timing seems correct, and changed if different resolution.

    0X5A is 11011101, means input HDMI is detected.

    B.R.

    Piero

  • 0 in reply to Piero Yu
    TI__Mastermind 30515 points
    It seems correct for HDMI signal detection.
    can you change one PC to try it? from our lab test, it should be ok. thanks.

    best regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 30 points

    We have changed the HDMI source,but issue is still on!

    If we use pattern generator like below pic,the RGB datas is valid.

    So the issue maybe is caused by someone of registers is wrong? OR the config of EVM is wrong?

  • 0 in reply to user1419113
    TI__Mastermind 30515 points
    In your data pattern test, you already used the external timing, and the HS/VS also has output in the UB926. so it seems the video data is not correct in your case? can you capture the UB926's CMLOUTPUT signal? Thanks.

    best regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 30 points

    The video data is correct and everything is OK when I use pattern test,But when I use ecternal video source (eg.PC),HS/VS/CLK is correct but the video data is always 0.I will check the UB926's CMLOUTPUT signal later.

  • 0 in reply to user1419113
    Intellectual 950 points

    Currently， 926 can get the data, but the image moves as the attached video.

    Seems the problem caused by the clk not locked?

    Any suggestion? Thanks.

  • 0 in reply to Piero Yu
    TI__Mastermind 30515 points
    Not, it is related with lock. you can double verify it.
    from the video display, the issue is the sync. issue in your processor side or the video control IC in the display panel side. thanks.

    best regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Intellectual 950 points

    Dear Steven,

    Another question，if ctm dont need the audio data, can 926 only output video without video blanking?

    Any intenal reigster can be set to do this? Thanks.

  • 0 in reply to Piero Yu
    TI__Genius 10475 points
    Hello,
    For a new topic or question, please create a separate/new E2E post as that will help you in getting a faster response.

    Thank you for your understanding.
  • 0
    TI__Mastermind 30515 points
    Piero,
    can you check the HDMI source?
    For UB929, it can support the internal EDID from sram with default 720P. thanks.

    best regards,
    Steven