Ampro LittleBoard 800, Справочное руководство

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Chapter 3 Hardware
50 Reference Manual LittleBoard 800
Ethernet Interfaces (J10, J23)
The Ethernet solution is provided by two Intel Ethernet controllers, 82541ER, and (Gigabit) 82541GI/PI
for Port 1 and Port 2 respectively. Both controllers consist of a Media Access Controller (MAC) and a
physical layer (PHY) combined into a single component solution.
10/100BaseT Ethernet Controller (U9)
Ethernet Port 1 uses an Intel 82551ER, 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.
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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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Ethernet port has a RJ-45 connector and the related magnetics integrated on the board.
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Ethernet port controller is connected to PCI bus
Tables 3-20 describes the pin-outs and signals of standard Ethernet port, Ethernet Port 1.
CAUTION The two Ethernet ports share a common ground, that is floating until you
determine how the grounds are connected, to signal ground or chassis ground.
Tables 3-20 and 3-21 describe the pin-outs and signals of two Ethernet ports 1 and 2, respectively.