Intel D425KT Product Specification - Page 20

Real-Time Clock Subsystem, 1.7 Legacy I/O Controller - ram

Get Intel D425KT PDF manuals and user guides View all Intel D425KT manuals
Add to My Manuals
Save this manual to your list of manuals

Page 20 highlights

Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product Specification 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 11 shows the location of the battery. 1.7 Legacy I/O Controller The Legacy I/O Controller provides the following features: • One serial port header • One serial port connector on the back panel • One parallel port connector with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support • Serial IRQ interface compatible with serialized IRQ support for PCI Conventional bus systems • PS/2-style keyboard and mouse ports • Intelligent power management, including a programmable wake-up event interface • PCI Conventional bus power management support The BIOS Setup program provides configuration options for the Legacy I/O controller. For information about The location of the serial port header The serial port header signal mapping Refer to Figure 10, page 39 Table 11, on page 41 20

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
Intel Desktop Board D425KT and Intel Desktop Board D425KTW Technical Product
Specification
20
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 11 shows the location of the battery.
1.7
Legacy I/O Controller
The Legacy I/O Controller provides the following features:
•
One serial port header
•
One serial port connector on the back panel
•
One parallel port connector with Extended Capabilities Port (ECP) and Enhanced
Parallel Port (EPP) support
•
Serial IRQ interface compatible with serialized IRQ support for PCI Conventional
bus systems
•
PS/2-style keyboard and mouse ports
•
Intelligent power management, including a programmable wake-up event interface
•
PCI Conventional bus power management support
The BIOS Setup program provides configuration options for the Legacy I/O controller.
For information about
Refer to
The location of the serial port header
Figure 10, page 39
The serial port header signal mapping
Table 11, on page 41