Intel SE7525GP2 - Manual (Page 55)

Intel® Server Board SE7320SP2 & Intel Server Board SE7525GP2 TPS Functional Architecture
Revision 2.0 55
3.6.9 Super I/O Chip
The Server I/O is the National Semiconductor* PC87427 controller. It is located on the Intel
6300ESB I/O Controller LPC bus. For LPC and SMBus access, the PC87427features a fast X-
Bus, over which boot flash and I/O devices can be accessed. The PC87427supports X-Bus
address line forcing (to 0 or 1) to access two BIOS code and data sets. The SMBus also
controls serial port float, RTC access, and serial port interconnection (snoop and take-over
modes). The PC87427 system health support includes a serial interface to LMPC0 health
sensors, fan monitoring and control, and a chassis intrusion detector. The PC87427 also
incorporates a Floppy Disk controller (FDC), two serial ports (UARTs), a keyboard and mouse
controller (KBC), General-Purpose I/O (GPIO), GPIO extension for additional off-chip GPIO
ports, and an interrupt serializer for parallel IRQs.
PC87427 Features:
• 3.3V operation, Standby powered.
• Legacy modules: FDC, two Serial ports (UARTs) and a keyboard and mouse controller
(KBC).
• LPC interface
• 8/16-bit fast X-Bus extension for boot flash, memory and I/O.
• Two sets of BIOS code and data support, for main and back-up BIOS.
• System health support, including LMPC sensor interface, fan monitor/control, and
chassis intrusion detection, for all configurations (i.e., with or without a BMC or mBMC).
• Serial Interface for manageability (Serial Interface M). Two-to-one internally multiplexing
of Serial Ports 1 and 2.
• One external serial port
• One internal serial port.
• 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 Boot process and for Operating
System use.
• Pulse-Width-Modulated Fan Speed Control and Fan Tachometer Monitoring