Ethernet Controller; Ethernet Interface - Lippert Cool SpaceRunner LX800 Technical Manual

3.5 Ethernet Controller

Intel 82551IT Fast Ethernet Controller
The 82551IT is an evolutionary addition to Intel's family of 8255x controllers. It provides excellent performance by
offloading TCP, UDP and IP checksums and supports TCP segmentation off-load for operations such as Large
Send. The 82551IT provides an extended operating temperature in addition to all of the same capabilities and
features as the 82551ER to address applications requiring a wider operating temperature range.
Its optimized 32-bit interface and efficient scatter-gather bus mastering capabilities enable the 82551IT to perform
high speed data transfers over the PCI bus. This capability accelerates the processing of high level commands
and operations, which lowers CPU utilization. Its architecture enables data to flow efficiently from the bus interface
unit to the 3 KB Transmit and Receive FIFO's, providing the perfect balance between the wire and system bus. In
addition, multiple priority queues are provided to prevent data underruns and overruns.
The 82551IT includes both a MAC and PHY. In also has a simple interface to the analog front end, which allows
cost effective designs requiring minimal board real estate. The 82551IT is pin compatible with the 82559 family of
controllers and is offered with software that provides backwards compatibility with previous 8255xER controllers.

Ethernet Interface

The Ethernet connector is shared with USB 0 and I²C bus.
Connector type:
Matching connector:
TME-104P-CSR-LX800-R1V11.doc
IDC10 pin header 2.54 mm
IDC10 pin female connector 2.54 mm
Pin Signal
1 ETH1-TX+
3 ETH1-RX+
5 SMB_CLK
7 USB0+
9 VCC_USB0
Rev 1.11
Pin Signal
2 ETH1-TX-
4 SMB_DATA
6 ETH1-RX-
8 USB0-
10 USB-GND
X9
18 (50)