Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Intel's Terms and Conditions of Sale for such products, Intel assumes no liability
whatsoever, and Intel disclaims any express or implied warranty, relating to sale and/or use of Intel products including liability or warranties relating to
fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. Intel products are not
intended for use in medical, life saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
The Intel
®
82801AA (ICH) and Intel
®
82801AB (ICH0) may contain design defects or errors known as errata which may cause the product to deviate
from published specifications. Current characterized errata are available upon request.
I
2
C is a two-wire communications bus/protocol developed by Philips. SMBus is a subset of the I
2
C bus/protocol and was developed by Intel.
Implementations of the I
2
C bus/protocol or the SMBus bus/protocol may require licenses from various entities, including Philips Electronics N.V. and
North American Philips Corporation.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature may be obtained by:
calling 1-800-548-4725 or
by visiting Intel's website at http://www.intel.com.
Copyright © Intel Corporation, 1999
*Third-party brands and names are the property of their respective owners.
ii
82801AA and 82801AB
Datasheet
Intel
®
82801AA (I CH) and Intel
®
82801AB (ICH0)
Features
s
PCI Bus Interface
— Supports PCI at 33 MHz
— Supports PCI Rev 2.2 Specification
— 133 MByte/sec Maximum Throughput
— Master PCI Device Support: up to 6 for the
ICH and up to 4 for the ICH0
Integrated IDE Controller
— Independent Timing of Up to 4 Drives
— The ICH Supports Ultra ATA/66 Mode (66
Mbytes/sec)
— Supports Ultra ATA/33 Mode
(33 Mbytes/sec)
— PIO Mode 4 Transfers up to 14 Mbytes/s
— Separate IDE Connections for Primary and
Secondary Cables
— Implements Write Ping-Pong Buffer for
faster write performance
USB
— UHCI Implementation With 2 Ports
— Supports Wake-up From Sleeping States
S1-S4
— Supports Legacy Keyboard/Mouse Software
— USB Revision 1.1 Compliant
AC'97 Link for Audio and Telephony CODECs
— AC’97 2.1 Compliant
— 5 Independent Bus Master Logic for PCM In,
PCM Out, Mic Input, Modem In, Modem
Out
— Separate Independent PCI Functions for
Audio and Modem
— Supports wake-up events
Interrupt Controller
— Two Cascaded 82C59
— Integrated I/O APIC Capability
— 15 Interrupts Support in 8259 Mode, 24
Supported in I/O APIC Mode.
— Supports Serial Interrupt Protocol
Timers Based on 82C54
System Timer, Refresh Request, Speaker Tone
Output
3.3 V Operation With 5 V Tolerant Buffers for
IDE and PCI signals.
241 BGA package
s
s
GPIO
— TTL, Open-Drain, Inversion
Power Management Logic
— ACPI 1.0 Compliant
— Support for APM-Based Legacy Power
Management for Non-ACPI Implementations
— ACPI Defined Power States (S1, S3, S4, S5)
— ACPI Power Management Timer
— SMI# Generation
— All Registers Readable/Restorable for Proper
Resume from 0 V Suspend States
— PCI PME#
Low Pin count (LPC) Interface
— Allows Connection of Legacy ISA and
X-Bus Devices such as Super I/O
— Supports Two Master/DMA Devices.
Enhanced DMA Controller
— Two Cascaded 8237 DMA Controllers
— PCI DMA: Supports PC/PCI — Includes
Two PC/PCI REQ#/GNT# Pairs
— Supports LPC DMA
— Supports DMA Collection Buffer to Provide
Type-F DMA Performance for All DMA
Channels
Real - Time Clock
— 256-byte Battery-Backed CMOS RAM
— Hardware implementation to indicate
Century Rollover
System TCO Reduction Circuits
— Timers to Generate SMI# and Reset Upon
Detection of locked system
— Timers to Detect Improper Processor Reset
— Integrated Processor Frequency Strap Logic
SM Bus
— Host Interface Allows Processor to
Communicate via SM Bus
— Compatible With Most 2-Wire Components
that are Also I
2
C compatible
Supports ISA Bus via External PCI-ISA Bridge
Firmware Hub (FWH) Interface
The 82801AA provides Alert On LAN*
Support
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
This datasheet describes the Intel
®
82801AA and Intel
®
82801AB components. Non-shaded areas
describe the functionality of both components.
Shading,as is shown here, indicates differences between the two components.
The Intel
®
82801AA and Intel
®
82801AB may contain design defects or errors known as errata which may cause the
products to deviate from published specifications. Current characterized errata are available on request.
82801AA and 82801AB
Datasheet
iii
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