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I feel both XGMII and SPI-4 will co-exist. XGMII is meant for only ethernet frames. SPI-4 is designed for a mix of Ethernet frames, IP packets and ATM cells. One of the functions of the MAC is assembling ethernet frames. So, there has to be a MAC in the Link device to send assembled ethernet frames to the PHY device through SPI-4 interface. It is redundant to have a MAC again in the PHY device. So, whether one uses XGMII or SPI-4 as the interface, it makes sense to have the MAC on the link layer side of the interfaces.