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Ethernet Transceiver LAN8740A failure

Question asked by Smart65 on Nov 14, 2014
Latest reply on Nov 17, 2014 by Smart65
Hi to all.

I'va a problem with Ethernet interface of the STM32F417xx uC.
I use the LAN8740A transceiver and the board work fine in 10Base-T mode but not when configured in 100BASE-TX mode (even though the signals micro-transceiver seems to be correct).
The transceiver is connected in MII mode and all register values look right (in either manual or autodetect initialization), the clock is correct (25MHz) ...

Any idea for the reason of failure ?

Thenks in advance.