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DP83848I: Ethernet DP83848 + Stm32F407 not working

Narongsak Lounsrimongkon
Prodigy 10 points
Part Number: DP83848I

Hi,

LED LINK is  glowing  , LED ACT is not glowing

Voltages are monitored at RBIAS - 1.2v, PFB pins - 1.8V

can you help me  please.

  • 0
    TI__Genius 11725 points

    Hello,

    To double check link LED, does register 0 also confirm link is established while LED LINK is glowing?

    What is LEDCR Register 0x18 reading? Does this confirm LED LINK and LED ACT mode is set as expected? 

    Thank you,

    Nikhil

  • 0
    Intellectual 320 points

    Hello,

    There are 2 problems.

    First: The RBIAS must to be 4,87k1% instead of 4,7k.

    Second (probably the main): The MDI_TN signal is connected to the TCT pin of RJ45 and the MDI_RP signal to the RD- pin of RJ45.

    Try jump those signals with short wireups.

    Jagher