DP83867ERGZ-R-EVM: MDC / MDIO

Juan Rodriguez2

If using the Ethernet PHY for 100Base T, is it necessary to control MDC and MDIO with a processor / CPLD/ FPGA? Can the pins float or should they be pulled-down / pulled-up?

over 6 years ago

0 Aniruddha Khadye over 6 years ago

TI__Mastermind 18425 points

Hi Juan,

DP83867 provides few options to control the features using bootstrap resistors. If all the features that you need are available on the bootstrap resistor pins then you can skip MDIO-MDC connections. For using other features MDIO-MDC should be used. I would recommend connecting a pull up resistor on MDIO pin as mentioned in the datasheet and at-least connect test points to MDIO-MDC. Register access is a important tool for prototype validation and debug.

-Regards

Aniruddha

0 Juan Rodriguez2 over 6 years ago in reply to Aniruddha Khadye

Prodigy 30 points

Thanks Aniruddha, I appreciate the help.

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DP83867ERGZ-R-EVM: MDC / MDIO