Product Overview Intel® Server Board SE7520BD2 Technical Product Specification
28 Revision 1.3
2.10 IO Sub-System Detail
2.10.1 Server I/O
The Server I/O is the National Semiconductor* PC87427 controller. It is located on the ICH5-R
LPC bus. For LPC and SMBus access, the PC87427 features 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.
The SIO3 has the following 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.
1. One external serial port
2. One internal serial port. This port can become the Emergency Management Port
(EMP) if the system management card supports EMP
• 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
2.10.2 Intel® 3-Volt Advanced+ Boot Block Flash Memory
The server board incorporates an Intel® 3 Volt Advanced+ Boot Block 28F320C3BD70 Flash
memory component. The flash memory device interfaces to the server I/O via the 16-bit XBUS
and contains the following:
• 32 megabit organized as 2048 K-words of 16 bits each
• Zero-latency, flexible block locking
• 128-bit Protection Register
• Ultra low-power operation at 2.7V
• Minimum 100,000 block erase cycles
• 48-pin VF-BGA package
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