Product Brief
December 2006
Revision 1.4
87427 ServerI/O with SensorPathTM Health Monitoring
The 87427 also incorporates a Floppy Disk Controller
(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.
General Description
The Winbond 87427 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 Management Controller
(BMC) or mini-BMC (mBMC), both of which are optional.
Outstanding Features
For LPC and SMBus access, the 87427 features a fast
X-Bus, over which boot flash and I/O devices can be ac-
cessed. The 87427 supports X-Bus address line forcing
(to 0 or 1) to create memory windows for BIOS data storage.
■ Legacy-reduced Advanced I/O, optimized for high-end
platforms. Legacy modules: FDC, two Serial Ports
(UARTs) and a Keyboard and Mouse Controller (KBC).
■ 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
87427 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
87427 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.
The 87427 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.
■ Two sets of BIOS code and data support, for main and
back-up BIOS.
■ Extremely low current consumption in Battery Backup
The 87427 supports SensorPath health monitor inter-
face to LMxx sensors, fan monitoring and control, and a
chassis intrusion detector.
mode.
■ Serial Interface for manageability (Serial Interface M).
Two-to-one multiplexing of Serial Ports 1 and 2.
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).
■ 52 GPIO ports with a variety of wake-up events, plus
GPIO extension for additional off-chip GPIO ports.
■ Watchdog for autonomous system recovery for BIOS
The 87427 supports both I/O and memory mapping of
module registers and enables building legacy-free systems.
Boot process and for operating system use.
■ 128-pin TFBGA package (for blade applications) and
128-pin PQFP package.
Block Diagram
PS/2
KBC Fan Fan Serial LPC
Serial
Serial
Interface 2
Floppy Disk
Interface
Serial
Interface 1
Serial
Interface M
Interfaces Ports
IRQ Interface
Clock
PWM Tach
Data
Route Matrix
ServerI/O
Clock
Fan Monitor
LPC Bus
Interface
SMBus Slave
Interface
Keyboard &
Mouse Controller
Serial
Port 1
Serial
Port 2
FDC
VDD
and Control
Internal Clocks
VBAT
VSB
Clock
GPIO
Ports Extension
X-Bus
Extension
GPIO
Health Monitor
System Wake-Up Control
RTC
Watchdog
Generator
and Control
Wake-Up Power
Events Control
Chassis
Intrusion
SCI &
SMI
Low-F High-F
Clock Clock
SensorPath
Interface
I/O
Ports
Port
Extension
XIRQ X-Bus
Interface
32.768
KHz
WDO
© 2006 Winbond Electronics Corporation
www.winbond.com
WINBOND [ WINBOND ]
