RGMII Ethernet Interface

I have found one pdf on Jetson Nano where its show Jetson nano has RGMII ethernet interface.
I want to implement RGMII interface in one of my project.
Please guide me on RGMII interface in Jetson Nano.final-product-brief-for-jetson-nano-bringing-original.pdf (1.6 MB)

Please refer to OEM Design Guide in DLC for interface design.