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Product Description
49
Table 18. Fan Connector Function/Operation for Desktop Boards with a Hardware
Monitoring and Fan Control ASIC
Connector Description
Processor fan • +12 V DC connection for a processor fan or active fan heatsink.
• Fan is on in the S0 or S1 state.
Fan is off when the system is off or in the S3, S4, or S5 state.
• Wired to a fan tachometer input of the hardware monitoring and fan control ASIC.
• Closed-loop fan control that can adjust the fan speed or switch the fans on or off
as needed.
Front chassis fan • +12 V DC connection for a system or chassis fan.
• Fan is on in the S0 or S1 state.
Fan is off when the system is off or in the S3, S4, or S5 state.
• Wired to a fan tachometer input of the hardware monitoring and fan control ASIC.
• Closed-loop fan control that can adjust the fan speed or switch the fans on or off
as needed.
Rear chassis fan • +12 V DC connection for a system or chassis fan.
• Fan is on in the S0 or S1 state.
Fan is off when the system is off or in the S3, S4, or S5 state.
• Wired to a fan tachometer input of the hardware monitoring and fan control ASIC.
• Closed-loop fan control that can adjust the fan speed or switch the fans on or off
as needed.
For information about Refer to
The location of the fan connectors Figure 13, page 62
The location of the fan connectors and sensors for thermal monitoring Figure 10, on page 43
The signal names of the fan connectors Section 2.8.2.2, page 62
1.14.2.3 LAN Wake Capabilities
CAUTION
For LAN wake capabilities, the +5 V standby line for the power supply must be capable of
providing adequate +5 V standby current. Failure to provide adequate standby current when
implementing LAN wake capabilities can damage the power supply. Refer to Section 2.11.3 on
page 79 for additional information.
LAN wake capabilities enable remote wake-up of the computer through a network. The LAN
subsystem PCI bus network adapter monitors network traffic at the Media Independent Interface.
Upon detecting a Magic Packet
†
frame, the LAN subsystem asserts a wake-up signal that powers
up the computer. Depending on the LAN implementation, the Desktop Boards D845GEBV2 and
D845GERG2 support LAN wake capabilities with ACPI in the following ways:
• The PCI bus PME# signal for PCI 2.2 compliant LAN designs
• The onboard LAN subsystem
• A CNR-based LAN subsystem
- Desktop Board 1
- D845GEBV2/D845GERG2 1
- Revision History 2
- Preface 3
- Other Common Notation 4
- Contents 5
- 3 Overview of BIOS Features 6
- 4 BIOS Setup Program 7
- Figures 8
- 1 Product Description 11
- 1.2 Overview 12
- 1.2.2 Manufacturing Options 13
- 1.2.3 Board Layouts 14
- 1.2.4 Block Diagrams 17
- Intel 845GE Chipset 18
- ✏ NOTE 19
- 1.5 Design Specifications 20
- 1.6 Processor 23
- 1.7 System Memory 24
- (Note 1) 25
- (Note 2) 25
- 1.8 Intel 26
- 845GE Chipset 26
- #INTEGRATOR’S NOTE 27
- and OpenGL 28
- 3 = Direct3D and OpenGL 28
- Notes: T = Text mode 29
- G = Graphics mode 29
- B = Banked addressing mode 29
- L = Linear addressing mode 29
- 1.8.1.4 AGP Connector 32
- INTEGRATOR’S NOTES 32
- 1.10 Audio Subsystem 37
- 1.10.1 Audio Connectors 38
- 1.11.1 Intel 39
- 1.11.2 Intel 39
- 1.12 CNR (Optional) 40
- 1.13.1.3 Thermal Monitoring 43
- 1.14 Power Management 44
- 1.14.1 ACPI 45
- Notes: 46
- 1.14.2 Hardware Support 47
- 1.14.2.1 Power Connector 48
- 1.14.2.2 Fan Connectors 48
- CAUTION 49
- 1.14.2.6 Resume on Ring 51
- 1.14.2.7 Wake from USB 52
- 2 Technical Reference 53
- 2.4 DMA Channels 55
- 2.6 Interrupts 56
- Technical Reference 57
- ICH4 USB 2.0 EHCI controller 58
- 2.8 Connectors 59
- 2.8.1 Back Panel Connectors 60
- 2.8.2.1 Expansion Slots 61
- INTEGRATOR’S NOTE 64
- 2.9 Jumper Blocks 72
- 2.10.3 I/O Shield 76
- 2.11.1 Power Consumption 78
- 2.12 Thermal Considerations 81
- 2.13 Reliability 84
- 2.14 Environmental 84
- 2.15 Regulatory Compliance 85
- 3.3 Resource Configuration 88
- 3.5 Legacy USB Support 89
- 3.6 BIOS Updates 90
- 3.7 Recovering BIOS Data 91
- 3.8 Boot Options 92
- Rapid BIOS Boot 93
- 3.10 BIOS Security Features 94
- 4.2 Maintenance Menu 96
- 4.3 Main Menu 97
- 4.4 Advanced Menu 98
- (Note 1, Note 2) 100
- 4.5 Security Menu 113
- 4.6 Power Menu 114
- 4.7 Boot Menu 115
- 4.8 Exit Menu 118
- What This Chapter Contains 119
- 5.2 Port 80h POST Codes 121
- 5.4 Speaker 126
- 5.5 BIOS Beep Codes 126
- Table 83. Beep Codes 127
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