Intel D845HV Product Specification - Page 28

Real-Time Clock, CMOS SRAM, and Battery

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Intel Desktop Board D845HV/D845WN Technical Product Specification The D845HV and D845WN boards support Laser Servo (LS-120) diskette technology through the IDE interfaces. An LS-120 drive can be configured as a boot device by setting the BIOS Setup program's Boot menu to one of the following: • ARMD-FDD (ATAPI removable media device - floppy disk drive) • ARMD-HDD (ATAPI removable media device - hard disk drive) For information about The location of the IDE connectors The signal names of the IDE connectors BIOS Setup program's Boot menu Refer to Figure 13, page 61 Table 39, page 67 Table 75, page 113 1.8.3.2 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 SCSI 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 SCSI controller. The LED indicates when data is being read from, or written to, both the add-in SCSI controller and the IDE controller. For information about The location of the SCSI hard drive activity LED connector The signal names of the SCSI hard drive activity LED connector Refer to Figure 13, page 61, or Figure 14, page 62 Table 40, page 67 1.8.4 Real-Time Clock, CMOS SRAM, and Battery The real-time clock provides a time-of-day clock and a multicentury calendar with alarm features. The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use. 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. The time, date, and CMOS values can be specified in the BIOS Setup program. The CMOS values can be returned to their defaults by using the BIOS Setup program.  NOTE If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS RAM at power-on. For information about Proper date access in systems with D845HV and D845WN boards Refer to Section 1.3, page 17 28

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Intel Desktop Board D845HV/D845WN Technical Product Specification
28
The D845HV and D845WN boards support Laser Servo (LS-120) diskette technology through the
IDE interfaces.
An LS-120 drive can be configured as a boot device by setting the BIOS Setup
program’s Boot menu to one of the following:
•
ARMD-FDD (ATAPI removable media device – floppy disk drive)
•
ARMD-HDD (ATAPI removable media device – hard disk drive)
For information about
Refer to
The location of the IDE connectors
Figure 13, page 61
The signal names of the IDE connectors
Table 39, page 67
BIOS Setup program’s Boot menu
Table 75, page 113
1.8.3.2
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
SCSI 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 SCSI controller.
The LED indicates
when data is being read from, or written to, both the add-in SCSI controller and the IDE controller.
For information about
Refer to
The location of the SCSI hard drive activity LED connector
Figure 13, page 61, or
Figure 14, page 62
The signal names of the SCSI hard drive activity LED connector
Table 40, page 67
1.8.4
Real-Time Clock, CMOS SRAM, and Battery
The real-time clock provides a time-of-day clock and a multicentury calendar with alarm features.
The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are
reserved for BIOS use.
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.
The time, date, and CMOS values can be specified in the BIOS Setup program.
The CMOS values
can be returned to their defaults by using the BIOS Setup program.
NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS
RAM at power-on.
For information about
Refer to
Proper date access in systems with D845HV and D845WN boards
Section 1.3, page 17