Intel D915GMH Product Specification - Page 41

Product Description

41

Table 8.

Effects of Pressing the Power Switch

If the system is in this state…

…and the power switch is

pressed for

…the system enters this state

Off

(ACPI G2/G5 – Soft off)

Less than four seconds

Power-on

(ACPI G0 – working state)

On



Soft-off/Standby

(ACPI G1 – sleeping state)

On


More than four seconds

Fail safe power-off


Sleep



Wake-up


Sleep


More than four seconds

Power-off


1.13.1.1

System States and Power States

Under ACPI, the operating system directs all system and device power state transitions.

The

operating system puts devices in and out of low-power states based on user preferences and

knowledge of how devices are being used by applications.

Devices that are not being used can be

turned off.

The operating system uses information from applications and user settings to put the

system as a whole into a low-power state.

Table 9 lists the power states supported by the board along with the associated system power targets.

See

the ACPI specification for a complete description of the various system and power states.

Table 9.

Power States and Targeted System Power

Global States

Sleeping States

Process

or States

Device States

Targeted System

Power

(Note 1)

G0 – working state

S0 – working

C0 –

working

D0 – working state.

Full power > 30 W

G1 – sleeping state

S1 – Processor

stopped

C1 – stop

grant

D1, D2, D3 – device

specification specific.

5 W < power < 52.5 W


S3 – Suspend to

RAM.

Context

saved to RAM.

No power

D3 – no power except

for wake-up logic.

Power < 5 W

(Note 2)


S4 – Suspend to

disk.

Context

saved to disk.

No power


for wake-up logic.

Power < 5 W

(Note 2)

G2/S5

S5 – Soft off.

Context not saved.

Cold boot is

required.

No power


for wake-up logic.

Power < 5 W

(Note 2)

G3 – mechanical off

AC power is

disconnected from

the computer.

No power to the

system.

No power

D3 – no power for

wake-up logic, except

when provided by

battery or external

source.

No power to the

system.

Service can

be performed safely.

Notes:

1.

Total system power is dependent on the system configuration, including add-in boards and peripherals powered

by the system chassis’ power supply.

2.

Dependent on the standby power consumption of wake-up devices used in the system.

Section	Page
Intel® Desktop Board D915GMH 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 Power Connector Terminology Change	11
1.3 Overview	12
1.3.1 Feature Summary	12
1.3.2 Manufacturing Options	13
1.3.3 Board Layout	14
1.3.4 Block Diagram	16
1.4 Online Support	17
1.5 Processor	17
1.6 System Memory	18
1.6.1 Memory Configurations	20
1.7 Intel® 915G Chipset	24
1.7.1 Intel 915G Graphics Subsystem	24
1.7.2 USB	26
1.7.3 IDE Support	26
1.7.4 Real-Time Clock, CMOS SRAM, and Battery	28
1.8 PCI Express Connectors	28
1.9 I/O Controller	29
1.9.1 Serial Port	29
1.9.2 Parallel Port	29
1.9.3 Diskette Drive Controller	29
1.9.4 Keyboard and Mouse Interface	30
1.10 Audio Subsystem	30
1.10.1 Audio Subsystem Software	31
1.10.2 Audio Connectors	31
1.10.3 8-Channel (7.1) Audio Subsystem	32
1.10.4 6-Channel (5.1) Audio Subsystem	34
1.11 LAN Subsystem	35
1.11.1 10/100 Mbits/sec LAN Subsystem	35
1.11.2 Gigabit LAN Subsystem	36
1.11.3 Alert Standard Format (ASF) Support	37
1.11.4 LAN Subsystem Software	38
1.12 Hardware Management Subsystem	38
1.12.1 Hardware Monitoring and Fan Control ASIC	38
1.12.2 Thermal Monitoring	39
1.12.3 Fan Monitoring	40
1.12.4 Chassis Intrusion and Detection	40
1.13 Power Management	40
1.13.1 ACPI	40
1.13.2 Hardware Support	42
1.14 Trusted Platform Module (Optional)	46
1.14.1 System Requirements	46
1.14.2 Warning of Potential Data Loss	46
1.14.3 Security Precautions	47
1.14.4 Trusted Platform Module Ownership	48
1.14.5 Enabling the Trusted Platform Module	49
1.14.6 Assuming Trusted Platform Module Ownership	49
1.14.7 Recovery Procedures	50
1.14.8 Clearing Trusted Platform Module Ownership	51
1.14.9 Software Support	52
2 Technical Reference	53
2.1 Introduction	53
2.2 Memory Resources	53
2.2.1 Addressable Memory	53
2.2.2 Memory Map	55
2.3 DMA Channels	55
2.4 Fixed I/O Map	56
2.5 PCI Configuration Space Map	57
2.6 Interrupts	58
2.7 PCI Conventional Interrupt Routing Map	59
2.8 Connectors	60
2.8.1 Back Panel Connectors	60
2.8.2 Component-side Connectors	64
2.9 Jumper Block	72
2.10 Mechanical Considerations	73
2.10.1 Form Factor	73
2.10.2 I/O Shield	74
2.11 Electrical Considerations	76
2.11.1 DC Loading	76
2.11.2 Add-in Board Considerations	76
2.11.3 Fan Connector Current Capability	76
2.11.4 Power Supply Considerations	77
2.12 Thermal Considerations	77
2.13 Reliability	79
2.14 Environmental	80
2.15 Regulatory Compliance	81
2.15.1 Safety Regulations	81
2.15.2 EMC Regulations	81
2.15.3 European Union Declaration of Conformity Statement	82
2.15.4 Product Ecology Statements	83
2.15.5 Product Certification Markings (Board Level)	84
3 Overview of BIOS Features	85
3.1 Introduction	85
3.2 BIOS Flash Memory Organization	86
3.3 Resource Configuration	86
3.3.1 PCI Autoconfiguration	86
3.3.2 PCI IDE Support	86
3.4 System Management BIOS (SMBIOS)	87
3.5 Legacy USB Support	87
3.6 BIOS Updates	88
3.6.1 Language Support	88
3.6.2 Custom Splash Screen	88
3.7 Boot Options	89
3.7.1 CD-ROM Boot	89
3.7.2 Network Boot	89
3.7.3 Booting Without Attached Devices	89
3.7.4 Changing the Default Boot Device During POST	89
3.8 Fast Booting Systems with Intel® Rapid BIOS Boot	90
3.8.1 Peripheral Selection and Configuration	90
3.8.2 Intel® Rapid BIOS Boot Raid BIOS Boot	90
3.9 BIOS Security Features	91
4 Error Messages and Beep Codes	93
4.1 BIOS Error Messages	93
4.2 Port 80h POST Codes	95
4.3 Bus Initialization Checkpoints	99
4.4 Speaker	100

Intel D915GMH Product Specification - Page 41

System States and Power States

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