Intel
82801BA ICH2 Datasheet
1-1
Introduction
Introduction
1
The Intel
82801BA ICH2 is a highly integrated multifunctional I/O Controller Hub that provides
the interface to the PCI Bus and integrates many of the functions needed in today’s PC platforms.
The ICH2 communicates with the host controller over a dedicated hub interface. This datasheet
provides a detailed description of the ICH2’s functions and capabilities including, signals,
registers, on-chip functional units, interfaces, pinout, packaging, electrical characteristics, and
testability.
1.1
About this Document
This datasheet is intended for Original Equipment Manufacturers and BIOS vendors creating
ICH2-based products. This document assumes a working knowledge of the vocabulary and
principles of USB, IDE, AC’97, SMBus, PCI, ACPI, LAN, and LPC. Although some details of
these features are described within this document, refer to the individual industry specifications
listed in
Table 1-1
for the complete details.
Chapter 1. Introduction
Chapter 1 introduces the ICH2 and provides information on document organization. This chapter
also describes the key features of the ICH2 and provides a brief description of the major functions.
Chapter 2. Signal Description
Chapter 2 provides a detailed description of each ICH2 signal. Signals are arranged according to
interface and details are provided as to the drive characteristics (Input/Output, Open Drain, etc.) of
all signals.
Chapter 3. ICH2 Power Planes and Pin States
Chapter 3 provides a complete list of signals, their associated power well, their logic level in each
suspend state, and their logic level before and after reset.
Chapter 4. ICH2 and System Clock Domains
Chapter 4 provides a list of each clock domain associated with the ICH2 in an ICH2-based system.
Chapter 5. Functional Description
Chapter 5 provides a detailed description of the functions in the ICH2. All PCI buses, devices and
functions in this manual are abbreviated using the following nomenclature; Bus:Device:Function.
This datasheet abbreviates buses as B0 and B1, devices as D8, D30 and D31 and functions as F0,
F1, F2, F3, F4, F5 and F6. For example Device 31 Function 5 is abbreviated as D31:F5, Bus 1
Device 8 Function 0 is abbreviated as B1:D8:F0. Generally, the bus number will not be used, and
can be considered to be Bus 0. Note that the ICH2’s external PCI bus is typically Bus 1; however, it
may be assigned a different number depending on system configuration.
Table 1-1. Industry Specifications
Specification
Location
LPC
http://developer.intel.com/design/pcisets/lpc/
AC’97
http://developer.intel.com/pc-supp/platform/ac97/
WfM
http://developer.intel.com/ial/WfM/usesite.htm
SMBus
http://www.sbs-forum.org/specs.htm
PCI
http://pcisig.com/specs.htm
USB
http://www.usb.org
ACPI
http://www.teleport.com/~acpi/
Powered by ICminer.com Electronic-Library Service CopyRight 2003