DM8168 GMII Interface Layout Guidelines

Hi,

I am interfacing EMAC0 controller of DM8168 with Gigabit Ethernet PHY in GMII mode. I am also interfacing EMAC1 controller of DM8168 in GMII mode with EMAC1 controller of AM3894 in reverse mode. Can someone provide what guidelines should be followed in PCB routing in both the cases?

I did not find any information in data sheet.

Thanks in advance.