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DP83849IF Strap Options

Sebastian Miesner
Prodigy 50 points
Other Parts Discussed in Thread: DP83849IF

I am using the DP83849IF Dual-Phy and want to use the Strap Options for automatic configuration during start-up. I am using actually an microblaze prozessor to set the register using the MDIO interface.

First I readout the actual register status and then I set the register and read out  the register status again. 

I can see that using the strap options nearly everything is alreight but in register 4 bit 7 (100BASE TX-Support) is 0 instead of 1. I have tested several strap options to set these bit to 1 but I have no idea which strap option I have to use.


I can´t find in datasheet an table with the corresponding strap options to a register.


If anyone now how to do this, please help.

  • 0
    TI__Mastermind 31600 points
    100Base-TX half-duplex is not supported in extender mode. Please check bits 10:9 of the RMII and Bypass Register (RBR), addresses 17h, to confirm the strap configuration for extender mode.

    Patrick
  • 0 in reply to Patrick OFarrell
    Prodigy 50 points
    Hello Patrick,
    I am using the Phy in RMII Mode without FX-Mode. I have disabled the extender mode (register 17h, bit 10:9 to '0') and I want to use 100Base-TX Full duplex mode not half-duplex.
    I have set in (ANAR)-Register Adress 04h, bit 8,bit 7 to '1' and bit 6 and bit 5 to '0'.
    I can set register 4h, bit 7 to '1' by using MDIO interface, but I want to use the strap options for that.
    I´m not quite sure if I need that bit 7, my configuration is to use fixed 100 Base tx/ rx full duplex mode.


    thanks for your valuable replay,

    Sebastian Miesner
  • 0 in reply to Sebastian Miesner
    TI__Mastermind 31600 points
    Sebastian,

    Extender mode can be disabled by strap. You just need to make sure that the RXD2_B pin is pulled low during power up and/or reset.

    Patrick