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DP83822I: Fast Link Pulse problems

Hao Wang14
Expert 4415 points
Part Number: DP83822I

Hi team,

One customer has problem listed below, could you please help to solve? Thank you! 

When DP838221 is tested, the waveform of pin TD_P and pin TD_M are shown in the picture below, can it meet the needs for actual use?

Another question: Pin RX_DV is connected to +3.3V through a 2.49k pull-up resistor, but when the board is powered up, the voltage on pin RX_DV is 0V, what may cause it?

  • 0
    TI__Mastermind 18425 points
    Hello Hao,

    Are the yellow and green traces from the PMD signals? Is the customer using a Differential probe?

    RX_DV is a multi functional pin. At power up, the pin behaves like a strap pin and the voltage is sampled at the pin for PHY configuration. After PHY configuration is completed, the pin transitions to I/O pins. As a I/IO pin, it is supposed to toggle high only when there is valid data received.

    -Regards,
    Aniruddha