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DP83822I: The output of MDC and MDIO is undefined(neither High nor Low)

Atsushi Takahashi
Intellectual 835 points
Part Number: DP83822I

Tool/software:

Hi Team,

The output of the MDC-pin and MDIO-pin is undefined(neither High nor Low) in a customer's system using the DP83822IRHBT.

An external 2.2kΩ pull-up resistor is used on the MDIO line.

Can you think of anything that might have caused it?

Please let me know if there is any information necessary to investigate this issue and if there is any way to use the MDC-pin and MDIO-pin appropriately.

Best Regards,