82801BA Datasheet, PDF (31/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

Introduction
1.2
Overview
The ICH2 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 I²C 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
Bus 0:Device 30:Function 0
Bus 0:Device 31:Function 0
Bus 0:Device 31:Function 1
Bus 0:Device 31:Function 2
Bus 0:Device 31:Function 3
Bus 0:Device 31:Function 4
Bus 0:Device 31:Function 5
Bus 0:Device 31:Function 6
Bus 1:Device 8:Function 0
Function Description
Hub Interface to PCI Bridge
PCI to LPC Bridge
(includes: DMA, Timers, compatible interrupt controller, APIC, RTC,
processor interface control, power management control, System
Management control, and GPIO control)
IDE Controller
USB Controller #1
SMBus Controller
USB Controller #2
AC’97 Audio Controller
AC’97 Modem Controller
LAN Controller
82801BA ICH2 and 82801BAM ICH2-M Datasheet
1-3