DP83822IF: EtherCAT statemachine error : "OP LNK_MIS A"

Hello,

I generated a custom PHY driver source for the DP83822IF.

MCU is AM2634

First of all, I changed the ETHPHY from Sysconfig to Custom and completed Device Name settings and PHY Address settings.

And I completed the driver source for Custom PHY and completed the Compile.

Next, I connected the Custom Board and Ethercat using TWINCAT3.

But in Ethercat Statemachine, "op" and "op lnk_mis a" appear alternately.

And the Lost Frame value is also increasing.

The below picture is such a phenomenon.

Could you know what the problem is?

Thank you