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RMII with external oscillator

Question asked by bernard.thomas on Feb 29, 2012
Latest reply on Feb 29, 2012 by AMSN
I have a problem to communicate with a PHY when I use an external oscillator for the Ethernet part.
If I use the clock generated by the microcontroller (MCO pin) there is no problem, the communication work fine.
But if I connect the external oscillator instead of the MCO pin, the communication (through the pin MDIO and MDC) does not work.
In my source code I have just removed the configuration of the MCO pin. I think in this case the microcontroller can not recognize the external oscillator and a problem of clock occurs.
If somebody has already used an external clock for the Ethernet part, I am interesting to know how to configure the registers in this case.
Thank you in advance !