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IMX7 with two KSZ9031RNX ethernet phy

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  • robertferanec
    replied
    Ah, they are strapping configuration pins? then yes, that could be the problem.

    Leave a comment:


  • Aziz
    replied
    Hi robert,

    I have measure 1.4V for pins : PHYAD0 and PHYAD1, that was not compliant with the specs of the micrel KSZ9031 PHY:
    specs:
    - vin<1.3V -> 0
    - vin >2V -> 1

    By changing the resistor value to 1k, i measure 1.1V for pins : PHYAD0 and PHYAD1 it's possible to set PHY Address to ‘00’.

    I try to do complementary tests
    Attached Files

    Leave a comment:


  • robertferanec
    replied
    You can find attached the measurement at power up :
    3.3v -> blue
    1.2v -> red
    Reset -> green
    I have measured 0.18v on reset pin during manual reset.
    Please attach manual RESET waveform when chip is powered up. I do not think, that the LED resistors are the problem (even if it may look that it fixed the problem).

    Leave a comment:


  • Aziz
    replied
    Hi,
    I have finally found a solution by changing the resistor value of pin LED1 and LED2.
    I have change 4.7k by 1k and it's work well
    Thank you a lot
    Attached Files

    Leave a comment:


  • Aziz
    replied
    Hi, thank you for your help,
    You can find attached the measurement at power up :
    3.3v -> blue
    1.2v -> red
    Reset -> green
    I have measured 0.18v on reset pin during manual reset.

    Thank you
    Attached Files

    Leave a comment:


  • robertferanec
    replied
    I have tried to reset ethernet phy manually but it doesn't work.
    When you do the manual reset, I would measure voltage directly on the ethernet reset pin - maybe the diode is causing problem and Ethernet reset pin doesn't have good enough LOW? I would double check if reset is long enough and I would double check if it is low enough (very close to 0V).

    Leave a comment:


  • Aziz
    replied
    I have tried to reset ethernet phy manually but it doesn't work.
    What do you think about my power sequencing attached?
    Attached Files

    Leave a comment:


  • robertferanec
    replied
    That looks to me like RESET or POWER sequencing problem. Try manually reset the chip in uBoot, that could help.

    Leave a comment:


  • Aziz
    replied
    When It's works, It always work after reset but randomly after power up.

    Leave a comment:


  • robertferanec
    replied
    What does it mean works randomly - when it works it always works and when it doesnt work, it doesnt work and usually it is after reset or power up? Or it is transferring, then it stops and then it starts working again?

    Leave a comment:


  • Aziz
    started a topic IMX7 with two KSZ9031RNX ethernet phy

    IMX7 with two KSZ9031RNX ethernet phy

    Hello Robert,

    I have designed a board based on openRex design with an IMX7 and two KSZ9031RNX ethernet phy.
    My problem is when i powered the board, the ethernets phy works randomly.
    Have you an idea?

    Thank you.
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