Intel
82801BA ICH2 Datasheet
1-3
Introduction
1.2
Overview
The ICH2 (82801BA) provides extensive I/O support. Functions and capabilities include:
PCI Rev 2.2 compliant with support for 33 MHz PCI operations.
PCI slots (supports up to 6 Req/Gnt pairs)
ACPI Power Management Logic Support
Enhanced DMA Controller, Interrupt Controller, and Timer Functions
Integrated IDE controller supports Ultra ATA100/66/33)
USB host interface with support for 4 USB ports; 2 host controllers
Integrated LAN Controller
System Management Bus (SMBus) with additional support for I
2
C devices
AC’97 2.1 Compliant Link for Audio and Telephony codecs (up to 6 channels)
Low Pin Count (LPC) interface
Firmware Hub (FWH) interface support
Alert On LAN* (AOL) and Alert On LAN 2 (AOL2)*
The ICH2 incorporates a variety of PCI functions that are divided into two logical devices
(30 and 31) on PCI Bus 0 and one device on Bus 1. Device 30 is the Hub Interface-To-PCI bridge.
Device 31 contains all the other PCI functions, except the LAN Controller as shown in
Table 1-2
.
The LAN controller is located on Bus 1.
Table 1-2. PCI Devices and Functions
Bus:Device:Function
Function Description
Bus 0:Device 30:Function 0
Hub Interface to PCI Bridge
Bus 0:Device 31:Function 0
PCI to LPC Bridge
(includes: DMA, Timers, compatible interrupt controller, APIC, RTC,
processor interface control, power management control, System
Management control, and GPIO control)
Bus 0:Device 31:Function 1
IDE Controller
Bus 0:Device 31:Function 2
USB Controller #1
Bus 0:Device 31:Function 3
SMBus Controller
Bus 0:Device 31:Function 4
USB Controller #2
Bus 0:Device 31:Function 5
AC’97 Audio Controller
Bus 0:Device 31:Function 6
AC’97 Modem Controller
Bus 1:Device 8:Function 0
LAN Controller
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