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DS90UH929-Q1: How to measure the waveform of FPD-Link III output

Genius 4310 points

Replies: 38

Views: 3820

Part Number: DS90UH929-Q1

E2E members,

I would like to measure the waveform of FPD-Link III output that like datasheet "9.2.3.1 Application Performance Plots".

1. Can I get it on DS90UH929-Q1EVM?
2. Could you tell me how to measure waveform of FPD-Link III output on EMV?
     - measurement points
     - how to set register for measurement

Regards,
Nao

  • Genius 4310 points

    In reply to Darryl Jeong:

    Hi, Darryl

    Thank you for pointing it out. I sent our customer these settings.
    Please wait the response from our customer.
    I was able to get to know about scope settings through talking to with you.
    Thank you very much for your support.

    BTW, I have additional questions about EVM setting.
    How do you set the EVM for measurement of eye diagram?
    #1 Do you use an internal pattern generator?
    If yes.
    #2 Could you please tell me the register settings?
    If no.
    #3 Could you please tell me how to another way?

    Regards,
    Nao
  • In reply to Nao:

    Hi Nao,
    You should not be using the pattern generator.
    You should provide the external HDMI clock frequency of the application.
    Can you supply the HDMI clock in?
    This is important to find the true eye of the application with the real source of the application.
  • Genius 4310 points

    In reply to Darryl Jeong:

    Hi, Darryl

    Thank you for your update.
    Yes. Our customer has HDMI source.

    But basically, just connecting the HDMI source to the DS90UH929 EVM
    does not recognize the HDMI signal.We need that HPD signal goes high.
    However The DS90UH929 can not go the HPD signal high
    without linking with the deserializer (We use DS90UH940 now).

    How can I output the HDMI source to FPD-Link with only DS90UH929?
    Now I am using "Assert HPD" of ALP. Is this the correct way?

    Regards,
    Nao

  • Genius 4310 points

    In reply to Nao:

    Hello Darryl

    Do you have any update?
    Is my understanding correct?

    Regards,
    Nao
  • In reply to Nao:

    Hi Nao,
    Since you don't have a deserializer you will need to write to these registers:
    0x5C[6] - force link ready
    0x27[80] - bypass the state machine
  • Genius 4310 points

    In reply to Darryl Jeong:

    Hi, Darryl

    Thank you for your reply.
    I will tell our customer your answer.

    Regards,
    Nao
  • Genius 4310 points

    In reply to Nao:

    Hi, Darryl

    Our customer was able to measure the waveform of FPD-Link III output.
    So, we close this E2E. Thank you very much.

    Regards,
    Nao
  • In reply to Nao:

    Hi Nao,
    You are very welcome.
    Thank you very much for you patience too.

    Regards,
    Darryl

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