The 82371AB PCI ISA IDE Xcelerator (PIIX4) is a multi-function PCI device implementing a PCI-to-ISA bridge

function, a PCI IDE function, a Universal Serial Bus host/hub function, and an Enhanced Power Management

function. As a PCI-to-ISA bridge, PIIX4 integrates many common I/O functions found in ISA-based PC

systems—two 82C37 DMA Controllers, two 82C59 Interrupt Controllers, an 82C54 Timer/Counter, and a Real

Time Clock.

Supported Kits for both Pentium® and Pentium® II Microprocessors

82430TX ISA Kit

82440LX ISA/DP Kit

Multifunction PCI to ISA Bridge

Supports PCI at 30 MHz and 33 MHz

Supports PCI Rev 2.1 Specification

Supports Full ISA or Extended I/O (EIO) Bus

Supports Full Positive Decode or Subtractive Decode of PCI

Supports ISA and EIO at 1/4 of PCI Frequency

Supports both Mobile and Desktop Deep Green Environments

3.3V Operation with 5V Tolerant Buffers

Ultra-low Power for Mobile Environments Support

Power-On Suspend, Suspend to RAM, Suspend to Disk, and Soft OFF System States

All Registers Readable and Restorable for Proper Resume from 0.V Suspend

Power Management Logic

Global and Local Device Management

Integrated 16 x 32-bit Buffer for IDE PCI Burst Transfers

Supports Glue-less “Swap-Bay” Option with Full Electrical Isolation

Enhanced DMA Controller

Two 82C37 DMA Controllers

Supports PCI DMA with 3 PC/PCI Channels and Distributed DMA Protocols (Simultaneously)

Fast Type-F DMA for Reduced PCI Bus Usage

Interrupt Controller Based on Two 82C59

15 Interrupt Support

Independently Programmable for Edge/Level Sensitivity

Supports Optional I/O APIC

Serial Interrupt Input

Timers Based on 82C54

System Timer, Refresh Request, Speaker Tone Output

USB

Two USB 1.0 Ports for Serial Transfers at 12 or 1.5 Mbit/sec

Supports Legacy Keyboard and Mouse Software with USB-based Keyboard and Mouse

Supports UHCI Design Guide

SMBus

Host Interface Allows CPU to Communicate Via SMBus

Slave Interface Allows External SMBus Master to Control Resume Events

Real-Time Clock

256-byte Battery-Back CMOS SRAM

Includes Date Alarm

Two 8-byte Lockout Ranges

Microsoft Win95* Compliant

324 mBGA Package

Suspend and Resume Logic

Supports Thermal Alarm

Support for External Microcontroller

Full Support for Advanced Configuration and Power Interface (ACPI) Revision 1.0 Specification and OS Directed Power Management

Integrated IDE Controller

Independent Timing of up to 4 Drives

PIO Mode 4 and Bus Master IDE Transfers up to 14 Mbytes/sec

Supports “Ultra DMA/33” Synchronous DMA Mode Transfers up to 33 Mbytes/sec