82378ZB Datasheet, PDF(1/137 Page) Intel Corporation

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82378ZB Datasheet, PDF (1/137 Pages) Intel Corporation – SYSTEM I/O APIC(SIO.A) AND

82378ZB SYSTEM I/O (SIO) AND

82379AB SYSTEM I/O APIC (SIO.A)

Provides the Bridge Between the PCI

Bus and ISA Bus

100% PCI and ISA Compatible

ï£§ PCI and ISA Master/Slave Interface

ï£§ Directly Drives 10 PCI Loads and 6

ISA Slots

ï£§ PCI at 25 MHz and 33 MHz

ï£§ ISA from 6 MHz to 8.33 MHz

Enhanced DMA Functions

ï£§ Scatter/Gather (S/G) (82378ZB)

ï£§ Fast DMA Type A, B and F (82378ZB)

ï£§ Compatible DMA Transfers

ï£§ 32-bit Addressability(82378ZB)

ï£§ 27-bit Addressability(82379AB)

ï£§ Seven Independently Programmable

Channels

ï£§ Functionality of Two 82C37A DMA

Controllers

Data Buffers to Improve Performance

ï£§ 8-Byte DMA/ISA Master Line Buffer

ï£§ 32-bit Posted Memory Write Buffer to

ISA

Integrated 16-bit BIOS Timer

Non-Maskable Interrupts (NMI)

ï£§ PCI System Errors

ï£§ ISA Parity Errors

Arbitration for ISA Devices

ï£§ ISA Masters

ï£§ DMA and Refresh

Four Dedicated PCI Interrupts

ï£§ Level Sensitive

ï£§ Mapped to Any Unused Interrupt

Arbitration for PCI Devices

ï£§ Six PCI Masters Supported

ï£§ Fixed, Rotating, or a Combination

Utility Bus (X-Bus) Peripheral Support

ï£§ Provides Chip Select Decode

ï£§ Controls Lower X-Bus Data Byte

Transceiver

Functionality of One 82C54 Timer

ï£§ System Timer

ï£§ Refresh Request

ï£§ Speaker Tone Output

Functionality of Two 82C59 Interrupt

Controllers

ï£§ 14 Interrupts Supported

ï£§ Edge/Level Selectable Interrupts

I/O APIC (Advanced Programmable

Interrupt Controller (82379AB)

ï£§ Support for Multi-Processor Systems

System Power Management (Intel SMM

Support)

ï£§ Programmable System Management

Interrupt (SMI)ï£§Hardware Events,

Software Events, EXTSMI#

ï£§ Programmable CPU Clock Control

(STPCLK#)

ï£§ Fast-On/Off Mode

208-Pin QFP Package

The 82378ZB System I/O (SIO) and 82379AB System I/O APIC (SIO.A) components are PCI-to-ISA Bus Bridge

devices. These devices integrate many of the common I/O functions found in today's ISA-based PC systemsï£§a

seven channel DMA controller, two 82C59 interrupt controllers, an 8254 timer/counter, a BIOS timer, Intel SMM

power management support, and logic for NMI generation. In addition, the SIO and SIO.A each support a total of

six PCI Masters, and four PCI Interrupts. Decode is provided for peripheral devices such as the flash BIOS, real

time clock, keyboard/mouse controller, floppy controller, two serial ports, one parallel port, and IDE hard disk

drive.

For both the SIO and SIO.A, each DMA channel supports compatibility transfers. The SIO also supports types

A, B, and F transfers and scatter/gather. In addtion to the standard ISA-compatible interrupt controller that is in

both the SIO and SIO.A, the SIO.A contains an Advance Programmable Interrupt Controller (IO APIC) for use in

multi-processing systems.

This document describes both the 82378ZB (SIO) and 82379AB (SIO.A) components. Unshaded areas describe

the 82378ZB. Shaded areas, like this one, describe differences between the 82379AB and 82378ZB.

Information in this document is provided in connection with Intel products. Intel assumes no liability whatsoever, including infringement of

any patent or copyright, for sale and use of Intel products except as provided in Intelâs Terms and Conditions of Sale for such products.

Intel retains the right to make changes to these specifications at any time, without notice. Microcomputer Products may have minor

variations to this specification known as errata. Other brands and names are the property of their respective owners.

March 1996

Order Number: 290571-001

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