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DP83848Q-Q1: DP83848Q-Q1 : Interfacing details

Tirthal Patel
Intellectual 340 points
Part Number: DP83848Q-Q1

Tool/software:

Hello Team,

We are using DP83848Q-Q1 IC ,operated for RMII interface.

We have some query regarding the pins,

1.For Pin 28 , X1 : RMII Reference Clock 50MHz ,this clock will be provided my our MPU .What should be the status of the Pin X2 ?

2.Wnat should be the configuration of the Pin 21 , CLK_OUT ?Should we assign test point and keep floating or Pullup pull down is required ?

3.What is the life cycle (EOL : End of Life) for this IC ,DP83848Q-Q1 ?

Regards,

Tirthal

  • 0
    TI__Expert 6525 points

    Hi Tirthal,

    1. In case there is an oscillator being used instead of a crystal, the pin X2 must be left unconnected. 
    2. If operated in RMII mode, the CLK_OUT pin simply outputs a 50Mhz clock. No PU/PD resistor should be required for this. 
    3. There are currently no end of life details for this product. 

    Best,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Intellectual 340 points

    Adding to my previous question,

    1.As I am using the RMII interface ,what should be the configuration of the Pins 35,38,39( COL/PHYAD0 ,PHYAD3 (RXD1_2) ,PHYAD4 (RXD1_3))

       Do they have requirement of Pullup/pulldown and are they required to connect with the MCU ? And what will be the PHY Address ?

    2.We want to operate the PHY in Auto-MDIX mode what should be its configuration ?

    Regards,

    Tirthal

  • 0 in reply to Tirthal Patel
    TI__Expert 6525 points

    Hi Tirthal,

    Tirthal Patel said:
    Pins 35,38,39( COL/PHYAD0 ,PHYAD3 (RXD1_2) ,PHYAD4 (RXD1_3))

    These pins are used for PHY Address strapping. These pins need to be Pulled up or down to configure the PHY address. Depending on what address you are trying to assign, these pins can be either pulled up or down. For more information on this, you can refer to section 3.8 of the datasheet.

    Tirthal Patel said:
    We want to operate the PHY in Auto-MDIX mode what should be its configuration

    Auto-MDIX is enabled by default and can be disabled by pulling down the RX_ER pin. 

    Best,

    Vivaan