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DP83822H: DP83822

shantanu hingmire
Prodigy 10 points

Part Number: DP83822H

Tool/software:

I am integrating the DP83822 Ethernet PHY with a Renesas RX72N microcontroller on a custom board using the RMII interface. The PHY reset sequence is executed properly, and the RESET_N pin goes high as expected. However, I am unable to read any register values from the DP83822 using the MDIO/MDC interface. 

Hardware Details:

  • MCU: Renesas RX72N

  • PHY: Texas Instruments DP83822

  • Interface: RMII (Reference Clock: 25MHz Crystal)

  • Power Supply: 3.3V (Checked and stable)

  • Connections:

    • MDC (PHY) <-> MDC (RX72N)

    • MDIO (PHY) <-> MDIO (RX72N) 

    • RESET_N (PHY) <-> MCU GPIO (Driven High after 10ms delay post-power-up)

  • 0
    TI__Mastermind 33165 points

    Hi,

    Are you able to show the DP83822 schematic? I can check this to ensure there are no issues with your MDC/MDIO implementation.

    If you'd like to share this privately, please accept my friendship request and use the 'direct message' feature on E2E. This will open a separate space that is only viewable by you and I.

    Best,

    Shane

  • 0
    TI__Mastermind 33165 points

    Hi Shantanu,

    Seeing as we have taken this conversation to private message, I'll resolve our E2E thread here.

    You can continue to reply here or in our private message and I will respond.

    Best,

    Shane