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DP83826EVM: About the setting method for DP83826EVM operation RMII test.

Si Yoon Kim
Intellectual 700 points
Part Number: DP83826EVM
Other Parts Discussed in Thread: USB-2-MDIO

Dear Team,

Hello, I have some questions for you from DP83826EVM.

I want to check various signals while changing the register. I have checked up to register read and write through USB-2-MDIO.

1. In EVM, MAC Interface was set to MII, but if you want to check the waveform in RMII Slave mode, can you just change the register value?
Or is it necessary to connect a MAC capable of CLK output to the PHY? I'm not sure how exactly.

2. I want to proceed with the MII loopback test using the EVM kit. Can I just change the register of the relevant area and connect the LAN cable to RJ45 to proceed with the loopback test?

please answer about my question. Thank you.

  • 0
    TI__Expert 5425 points

    Hi Si Yoon,

    1. You can change the device to RMII Slave mode through the register settings. In addition, the MAC will need to provide a 50 MHz CLK output to the PHY. You will have to remove R40 and put a 0 ohm resistor for R107 (connected to XI pin), and use the headers to provide the clock signal.
    2. Yes. You can set MII loopback mode through register writes. Afterwards, connect the cable to the RJ45 and start sending packets. If everything works properly, you should see the packets return.

    Regards,

    Adrian Kam

  • 0 in reply to Adrian Kam
    Intellectual 700 points

    Thanks for your reply.

    If so, is it true that in order to operate the EVM in RMII Slave mode, the MAC needs to be connected to the PHY chip with a jumper wire?

    I want to check all tests such as Loopback, RX, TX timing based on RMII Slave mode.

    please answer about my question. Thank you.

  • +1 in reply to Si Yoon Kim
    TI__Expert 5425 points

    Hi Si Yoon,

    In RMII Slave mode, the PHY needs to be supplied with a 50 MHz clock from an oscillator, either from the MAC or some other source. You will have to connect the MAC to the breakout board through jumpers, then connect the male connector on the breakout board to the female connector on the EVM.

    Regards,

    Adrian Kam