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DP83869HM: Problem to communicate with DP83869HM

Part Number: DP83869HM

Hi,

I am using a DP83869HM and i need to use the MDIO/MDC to configure registers.

My problem is that i that the data that i read are not coherant with what i shoud have and that i don't read what i have writen.

For example in the register 0x18, i should read 0x6150 but i read 0xC71F. And after writing 0x6150 I still read 0xC71F.

I join a screenshot of my transmission. Is there something wrong ?

Write register 0x18:

Read register 0x18:

thanks

Pascal