User’s Manual
EMB-9670/9673 Series User’s Manual
21
1.6.10 Ethernet
1.6.10.1 ICH4 LAN Controller
ICH4’s integrated LAN Controller includes a 32-bit PCI controller that provides enhanced
scatter-gather bus mastering capabilities and enables the LAN Controller to perform
high-speed data transfers over the PCI bus. Its bus master capabilities enable the
component to process high level commands and perform multiple operations, this lowers
processor utilization by off-loading communication tasks from the processor. Two large
transmit and receive FIFOs of 3 KB each help prevent data under runs and overruns while
waiting for bus accesses. This enables the integrated LAN Controller to transmit data with
minimum inter frame spacing (IFS).
The LAN Controller can operate in either full duplex or half duplex mode. In full duplex
mode the LAN Controller adheres with the IEEE 802.3x Flow Control specification. Half
duplex performance is enhanced by a proprietary collision reduction mechanism.
The integrated LAN controller also includes an interface to a serial (4-pin) EEPROM. The
EEPROM provides power-on initialization for hardware and software and software
configuration parameters.
From a software perspective, the integrated LAN controller appears to reside on the
secondary side of the ICH4’s virtual PCI to PCI Bridge. This is typically Bus 1, but may be
assigned a different number, depending on system configuration.
The following summarizes the ICH4 LAN controller features:
• Compliance with Advanced Configuration and Power Interface and PCI Power
Management Standard.
• Support for wake-up on interesting packets and link status change
• Support for remote power-up using Wake on LAN (WOL) technology
• Deep power-down no de support
• Support of Wired for management (WfM) Rev 2.0
• Backward compatible software with 82447, 82558 and 82559
• TCP/UDP checksum off load capabilities
• Support for intel’s Adaptive Technology
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