FW82371EB

**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