Intel D845PT Product Specification - Page 30

I/O Controller

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Intel Desktop Board D845BG/D845PT Technical Product Specification 1.8.4 Real-Time Clock, CMOS SRAM, and Battery The real-time clock provides a time-of-day clock and a multicentury calendar with alarm features. The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are reserved for BIOS use. 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. The time, date, and CMOS values can be specified in the BIOS Setup program. The CMOS values can be returned to their defaults by using the BIOS Setup program. ✏ NOTE If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS RAM at power-on. 1.8.5 Intel® 82802AB 4 Mbit Firmware Hub (FWH) The FWH provides the following: • System BIOS program • Logic that enables protection for storing and updating of platform information 1.9 I/O Controller The SMSC LPC47M142 I/O controller provides the following features: • Two serial ports • 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 1.2 MB or 1.44 MB diskette drive • Intelligent power management, including a programmable wake-up event interface • PCI power management support • Two fan tachometer inputs • Integrated USB hub The BIOS Setup program provides configuration options for the I/O controller. For information about SMSC LPC47M142 I/O controller Refer to http://www.smsc.com 30

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Intel Desktop Board D845BG/D845PT Technical Product Specification
30
1.8.4
Real-Time Clock, CMOS SRAM, and Battery
The real-time clock provides a time-of-day clock and a multicentury calendar with alarm features.
The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are
reserved for BIOS use.
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
º
C with 3.3 VSB applied.
The time, date, and CMOS values can be specified in the BIOS Setup program.
The CMOS values
can be returned to their defaults by using the BIOS Setup program.
✏
NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded into CMOS
RAM at power-on.
1.8.5
Intel
®
82802AB 4 Mbit Firmware Hub (FWH)
The FWH provides the following:
•
System BIOS program
•
Logic that enables protection for storing and updating of platform information
1.9 I/O Controller
The SMSC LPC47M142 I/O controller provides the following features:
•
Two serial ports
•
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 1.2 MB or 1.44 MB diskette drive
•
Intelligent power management, including a programmable wake-up event interface
•
PCI power management support
•
Two fan tachometer inputs
•
Integrated USB hub
The BIOS Setup program provides configuration options for the I/O controller.
For information about
Refer to
SMSC LPC47M142 I/O controller