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DP83848Q-Q1: Can't get link status to 1

Jeff Chen71
Expert 1345 points
Part Number: DP83848Q-Q1
Other Parts Discussed in Thread: TMS570LS3137,

Hi,

     I'm debug DP83848Q-Q1 with TMS570LS3137 . Now , I could read and write data to DP83848 register .

The link status always get logic-0 , If loopback field of BMCR is set then the Link Status become to logic-1

I had check below Items

1. Power Supply 3.3v/1.8v/1.2v is good

2.RJ45 is connect to a wifi router.

3.25Mhz Oscillater is good.

Please give me a way and advice to check something to get link status to logic1.

B.R.

Jeff Chen 

  • 0
    TI__Mastermind 18425 points
    Hi Jeff,

    The link status bit in Register 0x01 is Latch Low and needs to be read two times in order to get a correct link up indication. Did you try reading register 0x01 twice?
    Are there Link LEDs on the DP83848 board or the Wifi router? What is the status of the Link LEDs?

    -Regards,
    Aniruddha
  • 0 in reply to Aniruddha Khadye
    Expert 1345 points

    Hi Aniruddha,
    Thanks for your quickly reply. Both router LED and Link LED keep in off state.

    I also tried to loopback form RJ45 and LINKLED become light and link status was set.

    I have no ideal DP83848 how to determin the link status.

    Problem was solved , Because my design is MII mode the oscillator is 25MHz but the pin RX_DV had a pull up resistor.

    After remove the pull up ressitor , the link led is light when I conect RJ45 cable to router.

    Thank you very much.