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DP83TG720EVM-MC: DP83TG720 setup on via just strapping resistors

kenneth nguyen
Prodigy 60 points
Part Number: DP83TG720EVM-MC

Hi I currently have a custom design on an FPGA board that uses the DP83TG720RWRHATQ1. The strapping resistors on the custom PCB have the DP83TG720RWRHATQ1 set to RGMII, autonomous and slave mode  with RX and TX shift mode.

 I am currently trying to connect the custom board to the DP83TG720EVM-MC that then connects to the computer to ping the FPGA and test our automotive ethernet design. After I connect the hardware and attempt to ping the static IP address on my FPGA through my PC - I am unable to reach it. I also notice that the link LED and activity LED do not blink and are off on the eval board.

Is there any further setup needed through MDIO to setup the DP83TG720RWRHATQ1 or are the strapping resistors enough? Thank you for any feedback and guidance in advance.

  • 0
    TI__Mastermind 25715 points

    Hi Kenneth,

    An register read would be useful to debug the DP83TG720 PHY.

    I am not sure if I understand your question completely, Are you not able to perform a link or ping DP83TG720EVM with the PC? If so, are you able to read register on the PC?

    Some test we can do without the registers for debug:

    • Check VDDA and VDDIO voltage
    • Check Rbias resistance value and voltage
    • Check reset pin rather to make sure it is not active low

    --

    Regards,

    Hillman Lin 

  • 0 in reply to Hillman Lin
    Prodigy 60 points

    Hi, Hillman

    I am having issues bringing up the custom DP83TG720 PHY design. I was reading through this thread https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1213654/dp83tg720s-q1-u-boot-cannot-initiate
    One thing i would like to understand is that can the DP83TG720 be initiated without the software? if you do not understand this question can you refer me to a firmware engineer who does?

  • 0 in reply to kenneth nguyen
    TI__Mastermind 25715 points

    HI Kenneth,

    DP83TG720 could be configure using only strap option without software configuration. 

    However, there is limited option we can debug with only strap option without accessing register.

    Some test we can do without the register for debug:

    • Check VDDA and VDDIO voltage
    • Check Rbias resistance value and voltage
    • Check reset pin rather to make sure it is not active lo

    --

    Regards,

    Hillman Lin