PC87200 datasheet(1/33 Pages) NSC

Numer części	PC87200

Szczegółowy opis	PC87200 PCI to ISA Bridge

PDF	33 Pages

Scroll/Zoom	100%

Producent	NSC [National Semiconductor (TI)]

Strona internetowa	http://www.national.com

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1 / 33 page

www.national.com

August 1999

PC87200 PCI to ISA Bridge

1.0 General Description

The PC87200 Enhanced Integrated PCI-to-ISA bridge

works with an LPC chipset to provide ISA slot support. It is

a complement to the National Semiconductor PC8736x

Super I/O family.

2.0 Features

2.1 General

– Functionally compatible with Intel 82380AB

– 5.0 V tolerant PCI and ISA interfaces

– Slave mode serialized IRQ support for both quiet and

continuous modes

– PC/PCI DMA support

– 32-bit address decode for the 1MB BIOS ROM

– Supports ISA bus mastering

– 160-pin PQFP package

2.2 PCI-to-ISA Bridge

– PCI 2.1 compliant 33 MHz bus

– Supports PCI initiator-to-ISA and ISA master-to-PCI

cycle translations

– Subtractive agent for unclaimed transactions (see the

PROHIBIT signal description for exceptions)

– Parallel to Serial IRQ conversion including

IRQ3,4,5,6,7,9,10,11,12,14,15

– Supports 4 ISA slots directly without buffering

– Programmable ISA clock (8.33 to 11 MHz)

– Slow slew rate on edges

2.3 "PROHIBIT" functional support

– Disables PCI bus subtractive decoding when PRO-

HIBIT is asserted

Block Diagram

X-Bus

ISA Bus

PCI Bus

PCI to X-Bus / X-Bus to PCI Bridge

PCI Conﬁguration

Registers

X-Bus Arbiter

PC87200 Support

Serial IRQ Slave

mode interface logic

Serialized IRQ

Interface

PC/PCI DMA

Interface

ISA bus Target

Interface

ISA bus Master

Interface

PCPCIREQ#

PCPCIGNT#

Decoding logic

BPD#

PROHIBIT

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

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