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Chapter 3 Hardware
48 Reference Manual XTX 820
Ethernet Port Interface
The Ethernet solution is provided by integrating the functions of I/O Hub (82801FBM) and the Intel
82562GZ Fast Ethernet PCI controller chip together. The Intel 82562GZ chip provides the physical
layer (PHY) and the I/O Hub provides the Media Access Controller (MAC).
• Routed to J4 connector
• Supports full duplex or half-duplex operation
• Supports full duplex operation at 10 Mbps and 100 Mbps
• Provides IEEE 802.3 10BaseT/100BaseT compatible physical layer and LAN connect interface
• Supports IEEE 802.3u Auto-Negotiation
• Supports IEEE 802.3x 100BASE-TX flow control
• Provides 10Base-T auto-polarity correction
• Provides PHY detection of polarity, MDI-X, and cable lengths
• Supports Auto MDI, MDIX crossover at all speeds
• Provides Digital Adaptive Equalization control
• Provides Link Status interrupt capability and XOR tree mode support
• Supports 3-port LEDs (speed, link, and activity)
• Supports diagnostic loopback mode
• Provides low power at 3.3 V (less than 300 mW in active transmit mode)
• Reduced power in "unplugged mode" (less than 50 mW)
• Provides automatic detection of "unplugged mode"
• Baseboard must provide the Ethernet RJ-45 connector and the magnetics
Table 3-25. Simplified Ethernet Port Pin/Signal Descriptions (J4)
J4
Pin #
Signal Description
97 TX+
95 TX-
Analog Twisted Pair Ethernet Transmit Differential Pair – These pins
transmit the serial bit stream to the baseboard as differential signals.
93 RX
91 RX-
Analog Twisted Pair Ethernet Receive Differential Pair – These pins
receive the serial bit stream from the baseboard as differential signals.
GND Ground
10 LILED
Link Integrity LED – The LINK LED pin indicates link integrity. If the
link is valid in either 10 or 100 Mbps, the LED is on; if the link is
invalid, the LED is off.
12 ACTLED
Activity LED – The Activity LED pin indicates either transmit or receive
activity. When activity is present, the activity LED is on; when no
activity is present, the activity LED is off.
14 SPDLED Speed LED – The speed LED pin indicates the speed. The speed LED
will be on at 100 Mbps and off at 10 Mbps.
Note: The shaded area denotes power or ground.