Intel D2500CC Technical Product Specification for Intel Desktop Board D2500CC - Page 23

Real-Time Clock Subsystem

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Product Description For information about The location of the USB connectors on the back panel The location of the front panel USB headers Refer to Figure 9, page 41 Figure 11, page 43 1.5.3 SATA Support The board provides two SATA interface connectors that support one device per connector. The board's SATA controller offers independent SATA ports with a theoretical maximum transfer rate of 3.0 Gb/s on each port. One device can be installed on each port for a maximum of two SATA devices. A point-to-point interface is used for host to device connections, unlike PATA which supports a master/slave configuration and two devices on each channel. For compatibility, the underlying SATA functionality is transparent to the operating system. The SATA controller supports IDE and AHCI configuration and can operate in both legacy and native modes. In legacy mode, standard ATA I/O and IRQ resources are assigned (IRQ 14 and 15). In native mode, standard Conventional PCI bus resource steering is used. Native mode is the preferred mode for configurations using the Windows Vista* operating system. For information about Obtaining AHCI driver The location of the SATA connectors Refer to Section 1.2, page 16 Figure 11, page 43 1.6 Real-Time Clock Subsystem 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. When the voltage drops below a certain level, the BIOS Setup program settings stored in CMOS RAM (for example, the date and time) might not be accurate. Replace the battery with an equivalent one. Figure 1 on page 13 shows the location of the battery. 23

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Product Description
23
For information about
Refer to
The location of the USB connectors on the back panel
Figure 9, page 41
The location of the front panel USB headers
Figure 11, page 43
1.5.3
SATA Support
The board provides two SATA interface connectors that support one device per
connector.
The board’s SATA controller offers independent SATA ports with a theoretical
maximum transfer rate of 3.0 Gb/s on each port.
One device can be installed on each
port for a maximum of two SATA devices.
A point-to-point interface is used for host to
device connections, unlike PATA which supports a master/slave configuration and two
devices on each channel.
For compatibility, the underlying SATA functionality is transparent to the operating
system.
The SATA controller supports IDE and AHCI configuration and can operate in
both legacy and native modes.
In legacy mode, standard ATA I/O and IRQ resources
are assigned (IRQ 14 and 15).
In native mode, standard Conventional PCI bus
resource steering is used.
Native mode is the preferred mode for configurations using
the Windows Vista* operating system.
For information about
Refer to
Obtaining AHCI driver
Section 1.2, page 16
The location of the SATA connectors
Figure 11, page 43
1.6
Real-Time Clock Subsystem
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.
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate.
Replace the
battery with an equivalent one.
Figure 1 on page 13 shows the location of the battery.