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DP83TC814R-Q1: RMII Slave Mode XI

Part Number: DP83TC814R-Q1

Tool/software:

 

Hi-

I'm a bit confused by XI in this connection diagram. I believe XI should take a 50 MHz clock based on the wording in the pin descriptions. However, both a 50 MHz clock and 25 MHz clock are shown on XI in this image. 

1. Should I attach a 25MHz or 50MHz clock to XI? 

2. Can you confirm that XI is the correct pin to attach to the RMII interface? 

Thanks so much.