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DP83869HM: DP83869HM : 1000/100 Base t - Fiber Media converter strap and MDIO Register

Part Number: DP83869HM

Hi 

When an experiment was conducted after manufacturing a board using DP83859HM, the 1000M media converter function was performed without writing the register of the data sheet.

As far as I understand, I understood that the register should be changed after setting the strap pin to operate as a media converter, but is it right that the function works with just the strap?

Then, even if I change the circuit with the 100M media converter function, is there no need to write a register?

Or, is it right to write the register, but is it doing something abnormal?

The speed check and ping tests, and the traffic test with the Ethernet instrument were all normal at 1000M.

Thank you for reading

sincerly

Daechan LIM