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डेटा पत्रक - Tri-Mode Embedded Ethernet MAC Wrapper v4.4 - Xilinx

भाग संख्या VIRTEX-4
समारोह Tri-Mode Embedded Ethernet MAC Wrapper v4.4
मैन्युफैक्चरर्स Xilinx 
लोगो Xilinx लोगो 
पूर्व दर्शन
1 Page
		
<?=VIRTEX-4?> डेटा पत्रक पीडीएफ

VIRTEX-4 pdf
Virtex-4 Tri-Mode Embedded Ethernet MAC Wrapper v4.4
Ethernet Architecture Overview
Figure Top x-ref 1
Physical Sublayers
TCP
IP
FIFO
I/F
Ethernet
MAC
PCS
PMA
PMD
GMII/MII
1000BASE-X
RGMII
(RocketIO)
SGMII (RocketIO)
Figure 1: Typical Ethernet Architecture
Figure 1 displays the Ethernet MAC architecture from the MAC to the right, as defined in the IEEE
802.3 specification, and also illustrates where the supported physical interfaces fit into the architecture.
MAC
The Ethernet MAC is defined in the IEEE 802.3 specification clauses 2, 3, and 4. A MAC is responsible
for the Ethernet framing protocols and error detection of these frames. The MAC is independent of, and
can connect to, any type of physical sublayer.
GMII/MII
The Media Independent Interface (MII), defined in IEEE 802.3 clause 22, is a parallel interface that con-
nects a 10-Mbps and/or 100-Mbps capable MAC to the physical sublayers. The Gigabit Media Indepen-
dent Interface (GMII), defined in IEEE 802.3 clause 35, is an extension of the MII used to connect a
1-Gbps capable MAC to the physical sublayers. MII can be considered a subset of GMII, and as a result,
GMII/MII can carry Ethernet traffic at 10 Mbps, 100 Mbps, and 1 Gbps.
RGMII
The Reduced-GMII (RGMII) is an alternative to the GMII/MII. RGMII achieves a 45 percent reduction in
the pin count, achieved by the use of double-data-rate (DDR) flip-flops. For this reason, RGMII is pre-
ferred over GMII by PCB designers. RGMII can carry Ethernet traffic at 10 Mbps, 100 Mbps, and 1 Gbps.
SGMII
The Serial-GMII (SGMII) interface is an alternative to the GMII/MII. SGMII converts the parallel inter-
face of the GMII/MII into a serial format using a RocketIO, radically reducing the I/O count. For this
reason, it is often the preferred interface of PCB designers. SGMII can carry Ethernet traffic at 10 Mbps,
100 Mbps, and 1 Gbps.
2
www.xilinx.com
DS307 February 15, 2007
Product Specification

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