Datasheet

Intel Desktop Board D915GAV/D915GAG Technical Product Specification

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 on the D915GAV board Figure 18, page 64

The location of the SCSI hard drive activity LED connector on the D915GAG board Figure 19, page 66

The signal names of the SCSI hard drive activity LED connector Table 26, page 69

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 PCI Express Connectors

The boards provide the following PCI Express connectors:

• One PCI Express x16 connector supporting simultaneous transfer speeds up to 8 GBytes/sec

• Two PCI Express x1 connectors. The x1 interfaces support simultaneous transfer speeds up to

500 MBytes/sec

The PCI Express interface supports the PCI Conventional bus configuration mechanism so that the

underlying PCI Express architecture is compatible with PCI Conventional compliant operating

systems. Additional features of the PCI Express interface includes the following:

• Support for the PCI Express enhanced configuration mechanism

• Automatic discovery, link training, and initialization

• Support for Active State Power Management (ASPM)

• SMBus 2.0 support

• Wake# signal supporting wake events from ACPI S1, S3, S4, or S5

• Software compatible with the PCI Power Management Event (PME) mechanism defined in the

PCI Power Management Specification Rev. 1.1

1.9 I/O Controller

The I/O controller provides the following features:

• Two serial ports (Serial Port B is optional)

• One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port

(EPP) support

• Serial IRQ interface compatible with serialized IRQ support for PCI Conventional bus systems