
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 A Boot Block Flash Memory
The server board incorporates an Intel® 3 Volt A 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