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.
For LPC and SMBus access, the 87427 features a fast X-Bus, over which
boot flash and I/O devices can be accessed. It supports X-Bus address
line forcing (to 0 or 1) to create memory windows for BIOS data storage.
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 interconnection (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.
The 87427 provides a VSB-powered high-frequency clock for on-chip
peripherals, and a configurable high-frequency clock for other VSB-powered
platform components.
The 87427 supports SensorPath health monitor interface to National
Semiconductor® LMxx sensors, fan monitoring and control, and a chassis
intrusion detector. The System Wake-Up Control (SWC) module supports
flexible wake-up and power-off request mechanisms for all platforms
(i.e., with or without BMC/mBMC).
The 87427 supports both I/O and memory mapping of module registers
and enables building legacy-free systems. It 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.
Computer Logic IC 
