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DP83869HM: Ethernet ping not working for 100mbps.

bhardwaj kotha
Intellectual 280 points

Part Number: DP83869HM

Hi,

I am working on MIMXRT1176 custom board interfaced to DP83869HM ethernet phy. The hardware connections are given as shown in below image.

image.png

We have configured the phy as mentioned in datasheet for RGMII-Copper mode:

image.png

Then the ping is working for 10mbps but when changed to 100mbps then it is not working. 

Is there any timing registers need to modify?

 

  • 0
    TI__Mastermind 26791 points

    Hi, 

    Is the 100M link up? Also, could you check if the link partner advertises 100M?

    Best,

    J

  • 0 in reply to J
    Intellectual 280 points

    hi,

    No the link is not up for 100mbps. Yes the partner supports for 100mbps.

    Does the configuration is correct ? or any changes/extra registers required for below image configuration?

    image.png

    Thanks & regards,

    Bhardwaj.

  • 0 in reply to bhardwaj kotha
    TI__Mastermind 26791 points

    Hi Bhardwaj, 

    No other configuration is needed. I do not believe it is configuration issue since the PHY is linking up in 10M? What is the cable length? If the cable is not a good cable, the PHY and the LP may link up in 10M even though they both support 100M because of poor signal quality. Have you tried it on different LPs? Have you also tried disabling auto-negotiation and forcing 100M connection? You can write 0x2100 in register 00h to do so. 

    Best,
    J