Realtek PDF datasheets for RTL8218

The RTL8218D-CG integrates octal independent 10/100/1000M Ethernet transceivers into a single IC, and performs all the physical layer (PHY) functions for 1000Base-T, 100Base-TX, and 10Base-T Ethernet on category 5 UTP cable except 1000Base-T half-duplex. 10Base-T functionality can also be achieved on standard category 3 or 4 cable.

This device includes PCS, PMA, and PMD sub-layers. They perform encoding/decoding, clock/data recovery, digital adaptive equalization, echo cancellers, crosstalk elimination, and line driver, as well as other required supporting circuit functions. The RTL8218D also integrates an internal hybrid that allows the use of inexpensive 1:1 transformer modules.

Each of the four independent transceivers features an innovative XSGMII / QSGMII for reduced PCB traces. All transceivers can communicate with the MAC simultaneously through the same XSGMII.