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GbE PHY MDII to I2C interfacing.

Mike Lukie
Prodigy 10 points

I need to add a GbE PHY on an upgrade to an existing design but I do not have any pins to bring in the MDIO / MDC signals needed to control the PHY.  I do have an I2C bus coming into the board.  Short of an FPGA, is there a simple device(s) available to allow me to talk to the PHY over the I2C bus?  i.e. MDC @ 12 MHz vs. SCL @ 400 kHz.

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    TI__Mastermind 31600 points

    Mike,

    I was tracking back through some older posts and realized this post had never gotten a response.  Sorry for the oversight. 

    I am not aware of a simple device to convert between MDC/MDIO and SCL/SDA.  However, some Ethernet devices are beginning to incorporate an I2C interface. 

    What will you use for the controller / processor?  Given that you have I2C but not MDC/MDIO, I am curious what you are using for a MAC?  Most Ethernet MACs that I see include MDC/MDIO. 

    Patrick