Functional Description
5-6
Intel
82801BA ICH2 Datasheet
From a software perspective, the integrated LAN Controller appears to reside on the secondary side
of the ICH2’s virtual PCI-to-PCI Bridge (see
Section 5.1.2
). This is typically Bus 1; it may be
assigned a different number depending on system configuration.
Feature Summary
Compliance with Advanced Configuration and Power Interface and PCI Power Management
standards
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 mode support
Support of Wired for Management (WfM) Rev 2.0
Backward compatible software with 82557, 82558 and 82559
TCP/UDP checksum offload capabilities
Support for Intel’s Adaptive Technology
5.2.1
LAN Controller Architectural Overview
Figure 5-4
is a high level block diagram of the ICH2 integrated LAN Controller. It is divided into
four main subsystems: a Parallel subsystem, a FIFO subsystem and the Carrier-Sense Multiple
Access with Collision Detect (CSMA/CD) unit.
Parallel Subsystem Overview
The parallel subsystem is divided into several functional blocks: a PCI bus master interface, a
micromachine processing unit and its corresponding microcode ROM, and a PCI Target Control/
EEPROM/ interface. The parallel subsystem also interfaces to the FIFO subsystem, passing data
(e.g., transmit, receive, and configuration data) and command and status parameters between these
two blocks.
The PCI bus master interface provides a complete interface to the PCI bus and is compliant with
the PCI Bus Specification, Revision 2.2. The LAN Controller provides 32 bits of addressing and
data, as well as the complete control interface to operate on the PCI bus. As a PCI target, it follows
Figure 5-4. Integrated LAN Controller Block Diagram
CSMA/CD
Unit
Data Interface Unit
(DIU)
Four Channel
Addressing Unit -
DMA
PCI Bus
Interface Unit
(BIU)
PCI Target and
EEPROM Interface
Micro-
machine
Dual
Ported
FIFO
3 Kbyte
Rx FIFO
FIFO Control
3 Kbyte
Tx FIFO
EEPROM
Interface
PCI
Interface
LAN
Connect
Interface
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