PRELIMINARY
September 2003
Revision 1.0
PC87427
ServerI/O with SensorPathTM Health Monitoring
The PC87427 also incorporates a Floppy Disk Controller
General Description
(FDC), two serial ports (UARTs), a Keyboard and Mouse
Controller (KBC), General-Purpose Input/Output (GPIO),
GPIO extension for additional off-chip GPIO ports, and an
interrupt serializer for parallel IRQs.
The National Semiconductor PC87427 is targeted for a
wide range of servers, workstations and high-end desktops
that use the Low Pin Count (LPC) bus for the host interface
and an SMBus® interface for either a Baseboard Manage-
ment Controller (BMC) or mini-BMC (mBMC), both of which
are optional.
Outstanding Features
ꢀ Legacy-reduced Advanced I/O, optimized for high-end
platforms. Legacy modules: FDC, two Serial Ports
(UARTs) and a Keyboard and Mouse Controller (KBC).
For LPC and SMBus access, the PC87427 features a fast
X-Bus, over which boot flash and I/O devices can be ac-
cessed. The PC87427 supports X-Bus address line forcing
(to 0 or 1) to create memory windows for BIOS data storage.
ꢀ SensorPath system health support for LMXX sensors,
fan monitor/control, and chassis intrusion detection, for
all platforms (i.e., with or without a BMC or mBMC).
When VSB exists, the BMC or mBMC can access the
PC87427 and its fast X-Bus via SMBus. The SMBus also
controls serial port float, RTC access, and serial port inter-
connection (snoop and take-over modes). In addition, the
PC87427 provides routing of up to two selected LPC I/O
port transactions to the GPIO Extension Port.
ꢀ 8/16-bit fast X-Bus extension for boot flash, memory
and I/O.
ꢀ I/O-mapped and memory-mapped registers.
ꢀ VSB-powered SMBus access to modules and fast X-Bus.
ꢀ Two sets of BIOS code and data support, for main and
The PC87427 provides a VSB-powered high-frequency clock
for on-chip peripherals; it also provides a configurable high-
frequency clock for other VSB-powered platform components.
back-up BIOS.
ꢀ Extremely low current consumption in Battery Backup
mode.
The PC87427 supports SensorPath health monitor inter-
face to LMPCxx sensors, fan monitoring and control, and a
chassis intrusion detector.
ꢀ Serial Interface for manageability (Serial Interface M).
Two-to-one multiplexing of Serial Ports 1 and 2.
ꢀ 52 GPIO ports with a variety of wake-up events, plus
The System Wake-Up Control (SWC) module supports flex-
ible wake-up and power-off request mechanisms for all plat-
forms (i.e., with or without BMC/mBMC).
GPIO extension for additional off-chip GPIO ports.
ꢀ Watchdog for autonomous system recovery for BIOS
Boot process and for operating system use.
The PC87427 supports both I/O and memory mapping of
module registers and enables building legacy-free systems.
ꢀ 128-pin PQFP package.
Block Diagram
PS/2
Interfaces Ports
KBC Fan Fan Serial LPC
Serial
Serial
Interface 2
Floppy Disk
Interface
Serial
Interface 1
Serial
Interface M
IRQ Interface
Clock
PWM Tach
Data
Route Matrix
ServerI/O
Clock
Fan Monitor
LPC Bus
Interface
SMBus Slave
Interface
Keyboard &
Serial
Port 1
Serial
Port 2
FDC
VDD
Mouse Controller and Control
Internal Clocks
V
BAT
Clock
GPIO
Ports Extension
X-Bus
GPIO
Health Monitor
VSB
System Wake-Up Control
RTC
Watchdog
WDO
Generator
Extension
and Control
Wake-Up Power
Chassis
Intrusion
SCI &
SMI
Low-F High-F
Clock Clock
SensorPath
Interface
I/O
Port
Extension
XIRQ X-Bus
Interface
32.768
KHz
Events Control
Ports
National Semiconductor and TRI-STATE are registered trademarks of National Semiconductor Corporation. SensorPath is a trademark of National Semiconductor Corporation.
All other brand or product names are trademarks or registered trademarks of their respective holders.
© 2003 National Semiconductor Corporation
www.national.com
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