TMS320F28388D: How to write to the register of the EtherCAT PHY chip

Hi,

My customer is developing a servo motor driver using F28388D and DP83822.

He wants to change the register value of the DP83822.

I saw below figure and information about PHY Management Interface.

But I don't know how to implement this.

In the case of ethernet, there is a function such as Ethernet_writePHYRegister,

but the function for Ethercat was not found in C2000Ware.

I would like to get some reference or code on how to change the PHY register when using EtherCAT.