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DP83848C: RMII design

Part Number: DP83848C

I have a conflict it seems with regard to DP83848C RMII bus impedance.  The datasheet references the IEEE spec of 68 ohms for the bus impedance, but the TI design review package I received states 50 ohms for RMII interface.   Can I get a clarification on impedance specs for RMII interface (data and control) on the DP83848C I plan to use?  Apologies if this topic has come up before, I could not find it.