Intel D850GB Product Specification - Page 25

Real-Time Clock, CMOS SRAM, and Battery, SST 49LF004A 4 Mbit Firmware Hub FWH

Get Intel D850GB PDF manuals and user guides View all Intel D850GB manuals
Add to My Manuals
Save this manual to your list of manuals

Page 25 highlights

Product Description 1.6.3.2 SCSI Hard Drive Activity LED Connector The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in SCSI controller to use the same LED as the onboard IDE controller. For proper operation, this connector should be wired to the LED output of the add-in SCSI controller. The LED indicates when data is being read from, or written to, both the add-in SCSI controller and the IDE controller. For information about The location of the SCSI hard drive activity LED connector The signal names of the SCSI hard drive activity LED connector Refer to Figure 12, page 65 Table 43, page 66 1.6.4 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. For information about Proper date access in systems with D850GB boards Refer to Section 1.2, page 16 1.6.5 SST 49LF004A 4 Mbit Firmware Hub (FWH) The FWH provides the following: • System BIOS program • System security and manageability logic that enables protection for storing and updating of platform information 25

  • 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
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
Product Description
25
1.6.3.2
SCSI Hard Drive Activity LED Connector
The SCSI hard drive activity LED connector is a 1
x
2-pin connector that allows an add-in
SCSI controller to use the same LED as the onboard IDE controller.
For proper operation, this
connector should be wired to the LED output of the add-in SCSI controller.
The LED indicates
when data is being read from, or written to, both the add-in SCSI controller and the IDE controller.
For information about
Refer to
The location of the SCSI hard drive activity LED connector
Figure 12, page 65
The signal names of the SCSI hard drive activity LED connector
Table 43, page 66
1.6.4
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.
For information about
Refer to
Proper date access in systems with D850GB boards
Section 1.2, page 16
1.6.5
SST 49LF004A 4 Mbit Firmware Hub (FWH)
The FWH provides the following:
•
System BIOS program
•
System security and manageability logic that enables protection for storing and updating of
platform information