FW82371AB View Datasheet(PDF) - Intel

Part Name

Description

View to exact match

FW82371AB

PCI-TO-ISA / IDE XCELERATOR (PIIX4)

Intel 

82371AB (PIIX4)

E

1.0. ARCHITECTURAL OVERVIEW

PIIX4 is a multi-function PCI device that integrates many system-level functions. Figure 1 shows an example

system block diagram using PIIX4.

Processor

Host Bus

Second Level

Cache

Host-to-PCI

Bridge

PCI Bus (3.3V or 5V, 30/33 MHz)

Main

Memory

(DRAM)

Hard

CD ROM Disk

BMI IDE 82371AB

Ultra DMA/33 (PIIX4)

Hard

Disk

ISA/EIO Bus

(3.3V; 5V Tolerant)

USB 1

PCI Slots

USB 2

GP[I,O] (30+)

SMBus

Audio KBD

SP, PP,

FDC, IR

BIOS

pix4_sys

Figure 1. PIIX4 System Block Diagram

PCI to ISA/EIO Bridge

PIIX4 is compatible with the PCI Rev 2.1 specification, as well as the IEEE 996 specification for the ISA (AT)

bus. On PCI, PIIX4 operates as a master for various internal modules, such as the USB controller, DMA

controller, IDE bus master controller, distributed DMA masters, and on behalf of ISA masters. PIIX4 operates as

a slave for its internal registers or for cycles that are passed to the ISA or EIO buses. All internal registers are

positively decoded.

12

PRELIMINARY

4/9/97 2:23 PM PIIX4aDS

INTEL CONFIDENTIAL

(until publication date)

Share Link: