Technical Product Specification

Product Description

1.8 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 via the power supply 5 V STBY rail.

NOTE

If the battery and AC power fail, date and time values will be reset and the user will be

notified during the POST.

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 15 shows the location of the battery.

1.9 Legacy I/O Controller

The I/O controller provides the following features:

• Consumer Infrared (CIR) header

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

• Intelligent power management, including a programmable wake-up event interface

The BIOS Setup program provides configuration options for the I/O controller.

1.9.1 Consumer Infrared (CIR)

The Consumer Infrared (CIR) feature is designed to comply with Microsoft Consumer

Infrared usage models. Microsoft Windows 7 is the supported operating system for

these usage models.

The CIR receiving header consists of a filtered translated infrared input compliant with

Microsoft CIR specifications, and also a “learning” infrared input. This learning input is

simply a high pass input which the computer can use to “learn” to speak the infrared

communication language of other user remotes.

Customers are required to buy or create their own interface modules to connect to

Intel Desktop Boards for this feature to work.

For information about Refer to

Basic CIR Architecture http://msdn.microsoft.com/en-us/library/ff539443.aspx