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DP83TC813R-Q1: RGMII operation without XI possible ?

Part Number: DP83TC813R-Q1

Tool/software:

Hi experts,

Looking at our DP83TC813 recommended settings it seems like if you are using any MAC interface it is necessary to connect a reference clock.

However considering the RGMII application: 

It seems like there is no clock added.

Is this some an issue in our datasheet or is there really no need for adding an external clock when running on RGMII ? 

If so, how is the Clock generated ?

Regards,

Alex