Ethernet Interfaces (J10, J23); 10/100Baset Ethernet Controller (U9) - Ampro LittleBoard800 Reference Manual

Chapter 3

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.
• Backward software compatible to the 82559, 82558, and 82557
• Chained memory structure
• Full duplex or half-duplex support
• Full duplex support at 10Mbps and 100Mbps
• In half-duplex mode, performance is enhanced by a proprietary collision reduction mechanism.
• IEEE 802.3 10BaseT/100BaseT compatible physical layer to wire transformer
• 2 LED support for each port (speed, and link and activity are shared)
• Data transmission with minimum interframe spacing (IFS).
• IEEE 802.3u Auto-Negotiation support
• 3kB transmit and 3kB receive FIFOs (helps prevent data underflow and overflow)
• IEEE 802.3x 100BASE-TX flow control support
• Improved dynamic transmit chaining with multiple priorities transmit queues
• Ethernet port has a RJ-45 connector and the related magnetics integrated on the board.
• 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.
50 Reference Manual
Hardware
LittleBoard 800