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Original question:

Compiler/DP83TC811R-Q1: To initialize the PHY through software register configuration

Compiler/DP83TC811R-Q1: Will register writes override the pin strapping configuration?

Sal LaRussa
Genius 10050 points
Part Number: DP83TC811R-Q1


Tool/software: TI C/C++ Compiler

Hi,

If I understand correctly, the pin-strapped settings are read at power up or reset and a register write will override?   So for example, if I'm pin strapped to configure for MII interface, the MAC interface could potentially be changed to RMII after power up using a register write to xMII Control Register (xMII_CTRL).

Is that correct?

Thanks,

Sal

  • 0
    TI__Genius 11725 points

    Hi Sal,

    Yes this is correct. The strap settings determine PHY behavior on power up, but this can be overwritten by registers. However, a hard reset (writing 0x8000 to register 0x1DF or forcing reset pin low) will reset all registers and PHY will be reset to original strap settings. I hope this answers your question!

    Thank you,

    Nikhil