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Electrical Considerations

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Intel Desktop Board D915GUX/D915GHA Technical Product Specification 2.11 Electrical Considerations 2.11.1 DC Loading Table 35 lists the DC loading characteristics of the board. This data is based on a DC analysis of all active components within the board that impact its power delivery subsystems. The analysis does not include PCI add-in cards. Minimum values assume a light load placed on the board that is similar to an environment with no applications running and no USB current draw. Maximum values assume a load placed on the board that is similar to a heavy gaming environment with a 500 mA current draw per USB port. These calculations are not based on specific processor values or memory configurations but are based on the minimum and maximum current draw possible from the board's power delivery subsystems to the processor, memory, and USB ports. Use the datasheets for add-in cards, such as PCI, to determine the overall system power requirements. The selection of a power supply at the system level is dependent on the system's usage model and not necessarily tied to a particular processor speed. Table 35. DC Loading Characteristics Mode Minimum loading Maximum loading DC Power 200.00 W 300.00 W +3.3 V 3.30 A 6.00 A +5 V 10.00 A 14.00 A DC Current at: +12 V -12 V 9.00 A 0.03 A 16.00 A 0.10 A +5 VSB 0.80 A 1.40 A 2.11.2 Add-in Board Considerations The boards are designed to provide 2 A (average) of +5 V current for each add-in board. The total +5 V current draw for a fully loaded board (all three expansion slots and the PCI Express x16 slot filled) must not exceed 8 A. 2.11.3 Fan Connector Current Capability CAUTION The processor fan must be connected to the processor fan connector, not to a chassis fan connector. Connecting the processor fan to a chassis fan connector may result in onboard component damage that will halt fan operation. Table 36 lists the current capability of the fan connectors. Table 36. Fan Connector Current Capability Fan Connector Processor fan Front chassis fan Rear chassis fan Maximum Available Current 1000 mA 600 mA 600 mA 70

Section	Page
Intel® Desktop Boards D915GUX/D915GHA Technical Product Specification	1
Revision History	2
Preface	3
Intended Audience	3
What This Document Contains	3
Typographical Conventions	3
Other Common Notation	4
Contents	5
1 Product Description	11
1.1 PCI Bus Terminology Change	11
1.2 Overview	12
1.2.1 Feature Summary	12
1.2.2 Manufacturing Options	13
1.2.3 Board Layout	14
1.2.4 Block Diagram	16
1.3 Online Support	17
1.4 Processor	17
1.5 System Memory	18
1.5.1 Memory Configurations	19
1.5.1.1 Dual Channel (Interleaved) Mode Configurations	20
1.5.1.2 Single Channel (Asymmetric) Mode Configurations	22
1.6 Intel® 915G Chipset	23
1.6.1 Intel 915G Graphics Subsystem	23
1.6.1.1 Intel® GMA900 Graphics Controller	23
1.6.1.2 Dynamic Video Memory Technology (DVMT)	24
1.6.1.3 Advanced Digital Display 2 (ADD2) Card Support	24
1.6.1.4 Configuration Modes	25
1.6.2 USB	25
1.6.3 IDE Support	25
1.6.3.1 Parallel ATE IDE Interface	25
1.6.3.2 Serial ATA Interfaces	26
1.6.3.3 SCSI Hard Drive Activity LED Connector (Optional)	26
1.6.4 Real-Time Clock, CMOS SRAM, and Battery	27
1.7 PCI Express Connectors	27
1.8 I/O Controller	27
1.8.1 Serial Ports	28
1.8.2 Parallel Port	28
1.8.3 Diskette Drive Controller	28
1.8.4 Keyboard and Mouse Interface	28
1.9 Audio Subsystem	29
1.9.1 Audio Subsystem Software	29
1.9.2 Audio Connectors	29
1.9.3 Intel® High Definition Audio Subsystem	30
1.10 LAN Subsystem	31
1.10.1 10/100 Mbits/sec LAN Subsystem	31
1.10.1.1 Intel® 82562EZ Physical Layer Interface Device	31
1.10.1.2 RJ-45 LAN Connector with Integrated LEDs	31
1.10.2 Gigabit LAN Subsystem	32
1.10.2.1 Marvell Yukon 88E8050 PCI Express 1.0a Integrated MAC/PHY Gigabit Ethernet Controller	32
1.10.2.2 RJ-45 LAN Connector with Integrated LEDs	32
1.10.3 Alert Standard Format (ASF) Support	33
1.10.4 Intel® Wireless Connect Technology (Optional)	33
1.10.5 LAN Subsystem Software	34
1.11 Hardware Management Subsystem	34
1.11.1 Hardware Monitoring and Fan Control ASIC	34
1.11.2 Thermal Monitoring	35
1.11.3 Fan Monitoring	35
1.11.4 Chassis Intrusion and Detection	36
1.12 Power Management	36
1.12.1 ACPI	36
1.12.1.1 System States and Power States	37
1.12.1.2 Wake-up Devices and Events	38
1.12.2 Hardware Support	38
1.12.2.1 Power Connector	39
1.12.2.2 Fan Connectors	39
1.12.2.3 LAN Wake Capabilities	39
1.12.2.4 Instantly Available PC Technology	40
1.12.2.5 Resume on Ring	40
1.12.2.6 Wake from USB	40
1.12.2.7 Wake from PS/2 Devices	40
1.12.2.8 PME# Signal Wake-up Support	40
1.12.2.9 WAKE# Signal Wake-up Support	41
1.12.2.10 +5 V Standby Power Indicator LED	41
1.13 Trusted Platform Module (Optional)	42
1.13.1 System Requirements	42
1.13.2 Warning of Potential Data Loss	42
1.13.3 Security Precautions	43
1.13.3.1 Password Procedures	43
1.13.3.2 Emergency Recovery File Back Up Procedures	44
1.13.3.3 Hard Drive Image Backup Procedures	44
1.13.3.4 Clear Text Backup (Optional)	44
1.13.4 Trusted Platform Module Ownership	44
1.13.5 Enabling the Trusted Platform Module	45
1.13.6 Assuming Trusted Platform Module Ownership	45
1.13.7 Recovery Procedures	46
1.13.7.1 Recovering from Hard Disk Failure	46
1.13.7.2 Recovering from Desktop Board or TPM Failure	46
1.13.8 Clearing Trusted Platform Module Ownership	47
1.13.9 Software Support	48
2 Technical Reference	49
2.1 Introduction	49
2.2 Memory Resources	49
2.2.1 Addressable Memory	49
2.2.2 Memory Map	51
2.3 DMA Channels	51
2.4 Fixed I/O Map	52
2.5 PCI Configuration Space Map	53
2.6 Interrupts	54
2.7 PCI Conventional Interrupt Routing Map	55
2.8 Connectors	56
2.8.1 Back Panel Connectors	56
2.8.2 Component-side Connectors	58
2.8.2.1 Power Supply Connectors	62
2.8.2.2 Add-in Card Connectors	63
2.8.2.3 Auxiliary Front Panel Power/Sleep LED Connector	64
2.8.2.4 Front Panel Connector	64
2.8.2.4.1 Hard Drive Activity LED Connector [Yellow]	65
2.8.2.4.2 Reset Switch Connector [Purple]	65
2.8.2.4.3 Power/Sleep LED Connector [Green]	65
2.8.2.4.4 Power Switch Connector [Red]	65
2.8.2.5 Front Panel USB Connectors	65
2.8.2.6 Front Panel IEEE 1394a Connectors (Optional)	66
2.9 Jumper Block	67
2.10 Mechanical Considerations	68
2.10.1 Form Factor	68
2.10.2 I/O Shield	69
2.11 Electrical Considerations	70
2.11.1 DC Loading	70
2.11.2 Add-in Board Considerations	70
2.11.3 Fan Connector Current Capability	70
2.11.4 Power Supply Considerations	71
2.12 Thermal Considerations	72
2.13 Reliability	74
2.14 Environmental	74
2.15 Regulatory Compliance	75
2.15.1 Safety Regulations	75
2.15.2 EMC Regulations	75
2.15.2.1 FCC Compliance Statement (USA)	76
2.15.2.2 Canadian Compliance Statement	76
2.15.3 European Union Declaration of Conformity Statement	76
2.15.4 Product Ecology Statements	77
2.15.4.1 Disposal Considerations	77
2.15.4.2 Recycling Considerations	77
2.15.5 Product Certification Markings (Board Level)	78
3 Overview of BIOS Features	79
3.1 Introduction	79
3.2 BIOS Flash Memory Organization	80
3.3 Resource Configuration	80
3.3.1 PCI Autoconfiguration	80
3.3.2 PCI IDE Support	80
3.4 System Management BIOS (SMBIOS)	81
3.5 Legacy USB Support	81
3.6 BIOS Updates	82
3.6.1 Language Support	82
3.6.2 Custom Splash Screen	82
3.7 Boot Options	83
3.7.1 CD-ROM Boot	83
3.7.2 Network Boot	83
3.7.3 Booting Without Attached Devices	83
3.7.4 Changing the Default Boot Device During POST	83
3.8 Fast Booting Systems with Intel® Rapid BIOS Boot	84
3.8.1 Peripheral Selection and Configuration	84
3.8.2 Intel Rapid BIOS Boot	84
3.9 BIOS Security Features	85
4 Error Messages and Beep Codes	87
4.1 BIOS Error Messages	87
4.2 Port 80h POST Codes	89
4.3 Bus Initialization Checkpoints	93
4.4 Speaker	94

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Intel Desktop Board D915GUX/D915GHA Technical Product Specification

2.11

Electrical Considerations

2.11.1

DC Loading

Table 35 lists the DC loading characteristics of the board.

This data is based on a DC analysis of

all active components within the board that impact its power delivery subsystems.

The analysis

does not include PCI add-in cards.

Minimum values assume a light load placed on the board that

is similar to an environment with no applications running and no USB current draw.

Maximum

values assume a load placed on the board that is similar to a heavy gaming environment with a

500 mA current draw per USB port.

These calculations are not based on specific processor values

or memory configurations but are based on the minimum and maximum current draw possible

from the board’s power delivery subsystems to the processor, memory, and USB ports.

Use the datasheets for add-in cards, such as PCI, to determine the overall system power

requirements.

The selection of a power supply at the system level is dependent on the system’s

usage model and not necessarily tied to a particular processor speed.

Table 35.

DC Loading Characteristics

DC Current at:

Mode

DC Power

+3.3 V

+5 V

+12 V

-12 V

+5 VSB

Minimum loading

200.00 W

3.30 A

10.00 A

9.00 A

0.03 A

0.80 A

Maximum loading

300.00 W

6.00 A

14.00 A

16.00 A

0.10 A

1.40 A

2.11.2

Add-in Board Considerations

The boards are designed to provide 2 A (average) of +5 V current for each add-in board.

The total

+5 V current draw for a fully loaded board (all three expansion slots and the PCI Express x16 slot

filled) must not exceed 8 A.

2.11.3

Fan Connector Current Capability

CAUTION

The processor fan must be connected to the processor fan connector, not to a chassis fan

connector.

Connecting the processor fan to a chassis fan connector may result in onboard

component damage that will halt fan operation.

Table 36 lists the current capability of the fan connectors.

Table 36.

Fan Connector Current Capability

Fan Connector

Maximum Available Current

Processor fan

1000 mA

Front chassis fan

600 mA

Rear chassis fan

600 mA