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General Description
National Semiconductor’s PC8739x family of LPC SuperI/O
devices is targeted for a wide range of portable applications.
PC99 and ACPI compliant, the PC8739x family features
an X-Bus Extension for read and write operations over the
X-Bus, a full IEEE 1284 Parallel Port with a Parallel Port Mul-
tiplexer (PPM) for external Floppy Disk Drive (FDD) support,
a Musical Instrument Digital Interface (MIDI) port, and a
Game port. Like all National LPC SuperI/O devices, the
PC8739x offers a single-chip solution to the most commonly
used PC I/O peripherals.
The PC8739x family also incorporates: a Floppy Disk Con-
troller (FDC), two enhanced Serial Ports (UARTs), one with
Fast Infrared (FIR, IrDA 1.1 compliant), General-Purpose
Input/Output (GPIO) support for a total of 32 ports, Interrupt
Serializer for Parallel IRQs and an enhanced WATCH-
DOG
timer.
The following features apply to the PC87393F. The feature
lists for other PC8739x devices may differ. See the table on
page 3 for a list of features for each device.
Outstanding Features
G
X-Bus Extension for read and write operations
G
LPC bus interface, based on Intel’s LPC Interface Spec-
ification Rev. 1.01, February 1999 (supports CLKRUN
and LPCPD signals) and Intel FWH transactions
G
PC99 and ACPI compliant
G
Serial IRQ support (15 options)
G
Interrupt Serializer (four Parallel IRQs to Serial IRQ)
G
PPM for external FDD signal support
G
MIDI interface compatible with MPU-401 UART mode
G
Game port inputs for up to two joysticks
G
Protection features, including GPIO lock and pin con-
figuration lock
G
32 GPIO ports (16 standard, 16 with Assert IRQ/SMI)
G
5V tolerant and back-drive protected pins (except LPC
bus pins)
G
100-pin TQFP Package
Block Diagram
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Serial Port 2
with FIR
IEEE 1284
Parallel Port
Floppy Disk
Controller
Floppy Drive
Interface
Serial
Interface Interface
Infrared
Bus
Interface
LPC
Interface
I/O
Ports
WATCHDOG
Timer
WDO
Serial Port 1
Serial
Interface
GPIO Ports
Serial
IRQ
Parallel Port\
Floppy Drive Interface
SMI
PPM
MIDI
Interface
MIDI Port
Game Port
Game Device
Interface
X-Bus
Extension
X-Bus Interface
V
DD
Parallel
IRQs
Interrupt
Serializer
Wake-Up
Control
PWUREQ
PC87393 / PC87393F
2000 National Semiconductor Corporation
PRELIMINARY
September 2000
Revision 1.41
PC87391, PC87392, PC87393, PC87393F
100-Pin LPC SuperI/O Devices for Portable Applications