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PC8374L0IBU/VLA
SensorPath SuperI/O with Glue Functions [Preliminary]
PC8374L SensorPath
SuperI/O with Glue Functions
PreliminarySeptember 2003
Revision 1.0
PC8374L
SensorPath SuperI/O with Glue Functions
General DescriptionThe National Semiconductor PC8374L Advanced I/O prod-
uctisa memberof the PC8737x SuperI/O family. All
PC8737x devices are highly integrated and arepin and soft-
ware compatible, thus providing drop-in interchangeability
and enablinga varietyof assembly options using onlya sin-
gle motherboard and BIOS.
PC8374L integration allowsfora smaller systemboard sizeand
saves on total system cost.
The PC8374L includes legacy SuperI/O functions, system
glue functions, health monitoring and control, commonly
used functions suchas GPIO, and ACPI-compliant Power
Management support.
The PC8374L integrates miscellaneous analog and digital
system glue functionsto reduce the numberof discrete
components required. The host communicates with the
functions integratedinthe PC8374L device throughan LPC
Bus Interface.
The PC8374L extended wake-up support complements the
ACPI controllerinthe chipset. The System Wake-Up Control
(SWC) module, poweredbyVSB3, supportsa flexible wake-
up mechanism.
The PC8374L supports both I/O and memory mappingof
module registers and enables building legacy-free systems.
Outstanding Features SensorPath interfaceto LMxx sensordevicesfor system
health support Fan monitor and control Heceta6-compatible register set, accessibleviathe LPC
interface and SMBus Glue functionsto complement the South Bridge func-
tionality including flash and FDD write-protect controls VSB3-powered Power Management with 19 wake-up
sources Controls three LED indicators 16 GPIO ports with a variety of wake-up options I/O-mapped and memory-mapped registers. Legacy modules: Parallel Port, Floppy Disk Controller
(FDC), two Serial Ports, Slow InfraRed Port anda Key-
board and Mouse Controller (KBC) LPC interface, basedon Intel’s LPC Interface Specifica-
tion Revision 1.1, August 2002 PC01 Revision 1.0 and Advanced Configuration and
Power Interface (ACPI) Specification Revision 2.0 compliant 128-pin PQFP package
Block Diagram
DrvDrvLPC BusSouth Bridge
Serial Interfaces
Parallel Port Interface
Floppy Drive Interface
PS/2 Interfaces
KBC Ports
Infrared Interface
GPIO Ports
PC8374LLMxx SensorsSensorPath I/F
Drv
Tacho
PWM
LEDs
Power
Supply
Reset
Logic
Power Management
VBAT
SMBus I/F
System
BIOS
FLOCK
SMI
