82371AB

Features:

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
   - 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
   - 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


Pinout




Description

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. In addition to compatible transfers, each DMA channel supports Type F transfers. PIIX4 82371AB also contains full support for both PC/PCI and Distributed DMA protocols implementing PCI-based DMA. The Interrupt Controller has Edge or Level sensitive programmable inputs and fully supports the use of an external I/O Advanced Programmable Interrupt Controller (APIC) and Serial Interrupts. Chip select decoding is provided for BIOS, Real Time Clock, Keyboard Controller, second external microcontroller, as well as two Programmable Chip Selects. PIIX4 provides full Plug and Play compatibility. PIIX4 can be configured as a Subtractive Decode bridge or as a Positive Decode bridge. This allows the use of a subtractive decode PCI-to-PCI bridge such as the Intel 380FB PCIset which implements a PCI/ISA docking station environment.

PIIX4 82371AB supports two IDE connectors for up to four IDE devices providing an interface for IDE hard disks and CD ROMs. Up to four IDE devices can be supported in Bus Master mode. PIIX4 contains support for "Ultra DMA/33"synchronous DMA compatible devices.

PIIX4 82371AB contains a Universal Serial Bus (USB) Host Controller that is Universal Host Controller Interface (UHCI) compatible. The Host Controller's root hub has two programmable USB ports.

PIIX4 82371AB supports Enhanced Power Management, including full Clock Control, Device Management for up to 14 devices, and Suspend and Resume logic with Power On Suspend, Suspend to RAM or Suspend to Disk. 82371AB fully supports Operating System Directed Power Management via the Advanced Configuration and Power Interface (ACPI) specification. PIIX4 82371AB integrates both a System Management Bus (SMBus) Host and Slave interface for serial communication with other devices.