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DP83865DVH Termination

Hi,

I am designing an FPGA board wit the DP83865DVH. On the RGMII side, there are single-ended signals.

The datasheet states that the Termination resistor should be Rs=Zo-Zout.

Zo = 50ohm controled impedance on the board.

Zout=35ohm according to page 73 of the datasheet. Which means the termination resistor should be 15ohm.

However, when I look at the AppNote AN-1408, the thermination resistor is 33ohm. What should I be using? 15ohm or 33ohm?

Thanks