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40 gigabit media independent interface (XLGMII)

XLGMII is the media-independent interface of40 Gigabit Ethernet, equivalent to CGMII for 100 Gigabit Ethernet and to XGMII for 10 Gigabit Ethernet. XLGMII is the interface between the MAC layer and the Physical Coding Sublayer (PCS) of 40 Gigabit Ethernet.

XLGMII connects ports to each other and to other electronic boards in full duplex. Receive, transmit and control signals are transmitted over XLGMII. XGMII can only bridge small distances in the centimeter range and is therefore mainly used at board level for intra-chip connections. An extension is provided by the XLAUI.

Layer model for 40- and 100-gigabit Ethernet, according to IEEE 802.3ba

Layer model for 40- and 100-gigabit Ethernet, according to IEEE 802.3ba

The transmission paths of XLGMII for the transmit and receive data each comprise 64 bits, which are grouped into eight lanes with eight bits each. An additional transmitted control bit on each lane indicates whether it is data or control information. The transmit and receive paths have their own clock signals. The clock frequency of 625 MHz is derived from these clock signals via a frequency divider (1/64).

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Englisch: 40 gigabit media independent interface - XLGMII
Updated at: 30.11.2010
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Translations: DE