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TLK105 LED interface, MDIO

yassin ben naceur
Prodigy 160 points

Does any one has an idea if leaving this pin not connected to any thing might result to an expected behaviour of the chip.

In my case, I have been debugging why the software reset, neither the hardware reset work and ready the Basic status register returns all F ...

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    TI__Mastermind 23675 points
    Hi Yassin,

    I split this to a new chain if that is OK?

    From what you describe (all FFFFs and no software/hardware reset) the MDIO interface is not communicating with the PHY. There is a pull-up on the MDIO line, which would explain why you see all Fs. The PHY is not responding to the commands from the controller. When the controller toggles the CLK line, the PHY does not drive the MDIO line, which results in the line staying high due to the pull-up resistor. What is the value of the Pull-up resistor on the MDIO line? I would suggest that you also check to make sure you are trying to communicate with the correct PHY ID since you might be trying to communicate with an invalid address.

    Regards,
    Ross