Real-Time Clock, Cmos Sram, And Battery; I/O Controller - Intel BOXD865GVHZ Technical Product Specification

Intel Desktop Board D865GVHZ Technical Product Specification
1.7.3.3 SCSI Hard Drive Activity LED Connector (Optional)
The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in
hard drive controller to use the same LED as the onboard IDE controller. For proper operation,
this connector should be wired to the LED output of the add-in hard drive controller. The LED
indicates when data is being read from, or written to, either the add-in hard drive controller or the
onboard IDE controller (Parallel ATA or Serial ATA).
For information about
The location of the SCSI hard drive activity LED connector on the D865GVHZ board
The signal names of the SCSI hard drive activity LED connector

1.7.4 Real-Time Clock, CMOS SRAM, and Battery

A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer
is not plugged into a wall socket, the battery has an estimated life of three years. When the
computer is plugged in, the standby current from the power supply extends the life of the battery.
The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied.
✏
NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS
RAM at power-on.

1.8 I/O Controller

The I/O controller provides the following features:
•
One serial port
•
One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port
(EPP) support
•
Serial IRQ interface compatible with serialized IRQ support for PCI systems
•
PS/2-style mouse and keyboard interfaces
•
Interface for one 1.44 MB or 2.88 MB diskette drive
•
Intelligent power management, including a programmable wake-up event interface
•
PCI power management support
The BIOS Setup program provides configuration options for the I/O controller.
For information about
SMSC LPC47M172 I/O controller
National Semiconductor PC87372 I/O Controller
36
Refer to
Figure 17, page 68
Table 35, page 69
Refer to
http://www.smsc.com/
http://www.national.com/