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DP83848I-MAU-EK: 10Mbps DP83848 MAU

Prodigy 190 points

Replies: 10

Views: 752

Part Number: DP83848I-MAU-EK

Can you explain what the flat lines are in the eye diagram attached? (related to a question from Hung)

  • Hi User5364787,

    What is the relation between the scope picture and the previous E2E question? Is it measured on the same setup?

    If the PHY working in 10Mbps mode and connected to a link partner?

    -Regards,
    Aniruddha
  • In reply to Aniruddha Khadye:

    It was a follow up question posed to me after he solved his previous issue, so I believe it is the same set up.

  • In reply to Arash Sabet-Payman:

    Hi,

    Can you share the schematics and where on the system were the two waveforms measured?

    -Regards,
    Aniruddha
  • In reply to Aniruddha Khadye:

    Hi,

    I do not have that information. I believe this to be a measurement error, but don't want to make that assumption.

    Thanks
  • In reply to Arash Sabet-Payman:

    Hi,

    10Mbps idle pattern has a flat component in its waveform but its not a square wave. Which is why we would need to know where they are measuring both waveforms? Also is customer facing any issues due to this?

    -Regards,
    Aniruddha
  • In reply to Aniruddha Khadye:

    I am fairly confident that the user is doing his measurements incorrectly . I will follow up if I learn something new
  • In reply to Arash Sabet-Payman:

    Hi everyone,

    I received a little bit more information from the customer this morning and I would like to find out from you what additional information do we need to help solve this issue. 

    • Signals taken at TX+ vs TX- (short wires) shown in the picture below
    • My signal is 10Mbps Manchester coding when the chipset goes into 10Mbps.
    • Pink trace from the previous posting waveform is the Txclk, yes.

    Please let us know if this helps and if there is anything else you need. Thanks,

    John

  • In reply to John Griffith:

    Hi everyone,

    Any update on this? 

    Thanks, 

    John

  • In reply to John Griffith:

    Hi John,

    Is this still open? The conclusion was that there may be some setup issue on customer side.

    Also, what is the issue faced by customer? Is it no link, packet errors, cable reach etc?

    -Regards,
    Aniruddha
  • In reply to Aniruddha Khadye:

    Hi Aniruddha,

    On a previous message I have attached a diagram of where the customer was measuring the eye diagram like you asked and I added some additional information that they shared. I am asking you if you have any information you can share on how they should perform this test or if they are testing it at the correct location what debugging steps should they try so that they can get a proper measurement.

    Thanks,

    John

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