Datasheet
Intel Desktop Board D875PBZ Technical Product Specification
32
For information about Refer to
The location of the Serial ATA/Serial ATA RAID connectors Figure 19, page 66
The signal names of the Serial ATA/Serial ATA RAID connectors Table 32, page 67
The BIOS Setup program’s Boot menu Table 69, page 118
Serial ATA RAID configuration http://developer.intel.com/design/
motherbd/bz/index.htm
1.7.3.5 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
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 Refer to
The location of the SCSI hard drive activity LED connector Figure 19, page 66
The signal names of the SCSI hard drive activity LED connector Table 31, 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 Intel
®
82802AC Firmware Hub (FWH)
The 8 Mbit FWH provides the following:
• System BIOS program
• Logic that enables protection for storing and updating of platform information
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 diskette drive