Product Description
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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
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