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DP83822H: DP83822 Initialization and Standard Status Reports Implementation Help

Drew Doran
Prodigy 240 points
Part Number: DP83822H

Hi,

One of my customers has a question regarding the DP83822 and I was wondering if you could help answer it? 

Here is their question: 

"The DP83822 initialization and standard status reports need to be implemented in the MAC driver, but we could not find any existing code to help us in this task.

Any clue where we can find existing code? We run on WinCE, but any code example will be useful."

Thanks!

Regards,

Drew

  • 0
    TI__Mastermind 23675 points
    Hi Drew,

    The DP83822 does not need any initialization code. It will work right at power-up.
    We have HW bootstraps so that the PHY can be configured without need for MDIO/MDC access.
    However, if you do want to do MDIO/MDC access there is a Linux driver here:
    www.ti.com/.../ethernet-sw

    Kind regards,
    Ross
  • 0 in reply to Ross Pimentel
    Prodigy 100 points

    Hi Ross, we have continued working on the DP82833 in 100BASE-FX mode.
    I have 2 questions regarding Signal Detect.
    We are using the exact same schematics as the EVM, where SD from the transceiver (We also use the Avago AFBR-5803AQZ) is connected to Pin 24 of the DP82833. The SD signal from the transceiver is a single ended PECL signal, not compatible with the 3.3V CMOS input on pin 24 (LED1/GPIO1), even with pull-ups or pull-downs. So, I presume that the SD signal is not used on the EVM.

    1 - Without a SD signal from the transceiver, how will the DP83822 perceive the connection of an external device?
    2 - If Pin 24 is not used as Signal Detect, should we disable it by strapping RX_ER so that SD_DIS is set ?

    Also, we do not have a reliable communication from the PHY. We have copied the resistor values on the RX+, RX- TD+ and TD- lines from the EVM and it does not work well.

    3 - We need to know what are the expected levels on the DP83822 pins. The spec mentions peak values on the TD lines (programmable), but nothing about the RX lines an nothing concerning Common Mode voltages.


    Thanks for your support!