Intel D845EBT Product Specification - Page 26

Real-Time Clock, CMOS SRAM, and Battery, Mbit Firmware Hub FWH

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Intel Desktop Board D845EBT Technical Product Specification ✏ NOTE The BIOS will always recognize an LS-120 drive as an ATAPI floppy drive. To ensure correct operation, do not configure the drive as a hard disk drive. For information about The location of the IDE connectors The signal names of the IDE connectors IDE RAID support Refer to Figure 12, page 62 Table 39, page 67 Section 1.8, page 27 1.7.3.2 SCSI Hard Drive Activity LED Connector 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 12, page 62 Table 40, page 67 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. 1.7.5 4 Mbit Firmware Hub (FWH) The FWH provides the following: • System BIOS program • Logic that enables protection for storing and updating of platform information 26

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Intel Desktop Board D845EBT Technical Product Specification
26
✏
NOTE
The BIOS will always recognize an LS-120 drive as an ATAPI floppy drive.
To ensure correct
operation, do not configure the drive as a hard disk drive.
For information about
Refer to
The location of the IDE connectors
Figure 12, page 62
The signal names of the IDE connectors
Table 39, page 67
IDE RAID support
Section 1.8, page 27
1.7.3.2
SCSI Hard Drive Activity LED Connector
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 12, page 62
The signal names of the SCSI hard drive activity LED connector
Table 40, page 67
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
º
C 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.
1.7.5
4 Mbit Firmware Hub (FWH)
The FWH provides the following:
•
System BIOS program
•
Logic that enables protection for storing and updating of platform information