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Kinetis ENET PHY erratic MDIO read

Question asked by Konrad Gooding on Aug 9, 2012
Latest reply on Aug 16, 2012 by Paolo Alcantara Cadillo

We are using a TWR-K53N512 eval board. We are transmitting and receiving ethernet packets as expected, though communications with the PHY is erratic. Looking on a scope the 2MHz MDC clock is clean, as is the data outputted on MDIO from the K53. Though when a PHY read command is issued the data returned from the PHY is not clean. It rises slowly and then falls immediatelly. Lining up the positive clock edge with the data it has risen to just over half. This results in the K53 randomly detecting data bits. It seems as if something is trying to pull the line low. This occurs on all of our 3 towers.

 

Any help or ideas welcome.

 

Regards,

 

Konrad

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