Ampro Corporation Single Board Computer 700 - Manual (Page 50)

Chapter 3 Hardware
44 Reference Manual ReadyBoard 700
Ethernet Interfaces (J10, J11)
The Ethernet solution is provided by two Intel 82551ER PCI controller chips, which consists of both the
Media Access Controller (MAC) and the physical layer (PHY) combined into a single component
solution. The 82551ER is a 32-bit PCI controller that features enhanced scatter-gather bus mastering
capabilities, which enables the 82551ER to perform high-speed data transfers over the PCI bus. The
82551ER bus master capabilities enable the component to process high-level commands and perform
multiple operations, thereby off-loading communication tasks from the system CPU.
•
Backward software compatible to the 82559, 82558, and 82557
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Chained memory structure
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Full duplex or half-duplex support
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Full duplex support at 10Mbps and 100Mbps
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In half-duplex mode, performance is enhanced by a proprietary collision reduction mechanism.
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IEEE 802.3 10BaseT/100BaseT compatible physical layer to wire transformer
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2 LED support for each port (speed, and link and activity are shared)
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Data transmission with minimum interframe spacing (IFS).
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IEEE 802.3u Auto-Negotiation support
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3kB transmit and 3kB receive FIFOs (helps prevent data underflow and overflow)
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IEEE 802.3x 100BASE-TX flow control support
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Improved dynamic transmit chaining with multiple priorities transmit queues
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Each Ethernet port has a RJ-45 connector and the related magnetics integrated on the board.
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Each Ethernet port controller connected to Primary PCI bus
Tables 3-17 and 3-18 describe the pin-outs and signals of two Ethernet ports 1 and 2, respectively.
Table 3-17. Ethernet Port 1 Pin/Signal Descriptions (J10)
Pin # GND Digital Ground
1 TX1+
3 TX1-
Analog Twisted Pair Ethernet Transmit Differential Pair. These pins transmit
the serial bit stream for transmission on the Unshielded Twisted Pair Cable
(UTP). These signals interface directly with an isolation transformer.
4 RX1+
6 RX1-
Analog Twisted Pair Ethernet Receive Differential Pair. These pins receive the
serial bit stream from the isolation transformer.
9 ACT Link/Activity signal indicates a Link is established or Activity is occurring
11 SPEED Speed signal for 10BaseT or 100BaseT transfer rate
2, 7, 8 NC Not connected
5, 13, 14 GND Grounded (goes to ground through 0.1
µ
capacitor)
10, 12 +3VSB +3V for plus side of LEDs. See Table 2-6.
Notes: The shaded area denotes power or ground.