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DP83867E: DP83867E: 1000M RGMII mode can not work。

user6152230
Prodigy 100 points
Part Number: DP83867E

hello，

My board uses DP83867E + FPGA, and my board uses 100M mode to successfully communicate with the computer.
I want to make the board work in RGMII, 1000Mhz, full-duplex mode.
My current situation is that no matter how to configure DP83867E, it will not succeed. When the board is connected to the computer via a network cable, the computer cannot recognize the network connection.
How should I configure to DP83867E, please give me a complete register configuration flow chart. Make sure it can work in RGMII, 1000Mhz, full-duplex mode.

This problem has troubled me for a long time, please help me。

（I can make sure that the RGMII timing is correct, because using my FPGA code can successfully connect to the Ethernet on other chips.）

Regards

  • 0
    TI__Genius 9920 points

    Hello,

    Thank you sharing your question. Can you please provide the register dump for when you are set in RGMII 100M mode and when you are in RGMII 1000M? Do you plan on only using register configuration or straps to switch between modes?

    Thanks,

    Cecilia

  • 0 in reply to Cecilia Reyes
    Prodigy 100 points

    Hello,Cecilia

    The following two pictures are 1000M mode and 100M mode, the registers that DP83867E reads while running. Register address 0~31.

    I have tried to use the register to switch the mode, still 100M can be connected, 1000M can not be connected.

    When I set to 100M mode, it can run normally.
    When I set to 1000M RGMII mode abnormal, DP83867 MDI has no signal output.

    Regards

  • 0 in reply to user6152230
    TI__Genius 9920 points

    Hello,

    Thanks for sharing the register dump. I was actually look at specifically register 0x0032 to confirm RGMII mode. 

    I also see that there is no link on the 1G register. Are you forcing 1G on your link partner or is it auto-negotiation? You have also said that your timing is correct however you may need to try enabling the RGMII clock skew in case the DP83867 is aligned. 

    Thanks,

    Cecilia