Ethernet Transceiver LAN8740A failure

[paolo239955_stm1_stmicro_com]

Posted on November 14, 2014 at 18:24

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.

Paolo

#ethernet #stm32f4

[jkrueger]

Posted on November 15, 2014 at 03:36

Paolo,

I don't have an answer to your question, but am curious, did you use STMCubeMx & STMCubeF4 to begin your project containing the LAN8740A ?

Jeff

[paolo239955_stm1_stmicro_com]

Posted on November 17, 2014 at 09:06

Hi Jeff.

Yes, I started from the LxIP IAP application example of STM32Cube_FW_F4_V1.3.0.

I adapted the MII interface to the new package of uC (TQFP100 instead of BGA of EvalBoard) and to the specific registers of the new transceiver.

Thanks

Paolo