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Instantly Available PC Technology, CAUTION

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Intel Desktop Board D845BG/D845PT Technical Product Specification 1.14.2.4 Instantly Available PC Technology CAUTION For Instantly Available PC technology, 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 Instantly Available PC technology can damage the power supply. Refer to Section 2.11.3 on page 83 for additional information. Instantly Available PC technology enables the D845BG and D845PT boards to enter the ACPI S3 (Suspend-to-RAM) sleep-state. While in the S3 sleep-state, the computer will appear to be off (the power supply is off, and the front panel LED is amber if dual colored, or off if single colored.) When signaled by a wake-up device or event, the system quickly returns to its last known wake state. Table 10 on page 41 lists the devices and events that can wake the computer from the S3 state. The D845BG and D845PT boards support the PCI Bus Power Management Interface Specification. For information on the versions of this specification, see Section 1.5. Add-in boards that also support this specification can participate in power management and can be used to wake the computer. The use of Instantly Available PC technology requires operating system support and PCI 2.2 compliant add-in cards and drivers. The standby power indicator LED shows that power is still present even when the computer appears to be off. Figure 10 shows the location of the standby power indicator LED. CAUTION If AC power has been switched off and the standby power indicator is still lit, disconnect the power cord before installing or removing any devices connected to the board. Failure to do so could damage the board and any attached devices. CR3H1 OM12987 Figure 10. Location of the Standby Power Indicator LED 44

Section	Page
Intel® Desktop Board D845BG/D845PT Technical Product Specification	1
Revision History / Disclaimer	2
Preface	3
Intended Audience	3
What This Document Contains	3
Typographical Conventions	3
Notes, Cautions, and Warnings	3
Other Common Notation	4
Contents	5
1 Product Description	11
1.1 Board Differences	11
1.2 Overview	12
1.2.1 Feature Summary	12
1.2.2 Manufacturing Options	13
1.2.3 Board Layouts	14
1.2.4 Block Diagram	16
1.3 Online Support	18
1.4 Operating System Support	18
1.5 Design Specifications	19
1.6 Processor	22
1.7 System Memory	23
1.8 Intel® 845 Chipset	25
1.8.1 AGP	26
1.8.2 USB	27
1.8.3 IDE Support	29
1.8.4 Real-Time Clock, CMOS SRAM, and Battery	30
1.8.5 Intel® 82802AB 4 Mbit Firmware Hub (FWH)	30
1.9 I/O Controller	30
1.9.1 Serial Ports	31
1.9.2 Parallel Port	31
1.9.3 Diskette Drive Controller	32
1.9.4 Keyboard and Mouse Interface	32
1.10 Audio Subsystem	33
1.10.1 Audio Connectors	34
1.10.2 Audio Subsystem Software	34
1.11 LAN Subsystem (Optional)	35
1.11.1 Intel® 82562ET Platform LAN Connect Device	35
1.11.2 RJ-45 LAN Connector with Integrated LEDs	35
1.11.3 LAN Subsystem Software	36
1.12 CNR (Optional)	36
1.13 Hardware Management Subsystem	37
1.13.1 Hardware Monitor Component	37
1.13.2 Fan Monitoring	37
1.13.3 Chassis Intrusion and Detection	38
1.14 Power Management	38
1.14.1 ACPI	38
1.14.2 Hardware Support	42
2 Technical Reference	47
2.1 Introduction	47
2.2 Memory Map	47
2.3 I/O Map	48
2.4 DMA Channels	50
2.5 PCI Configuration Space Map	50
2.6 Interrupts	51
2.7 PCI Interrupt Routing Map	52
2.8 Connectors	54
2.8.1 Back Panel Connectors	55
2.8.2 Internal I/O Connectors	58
2.8.3 External I/O Connectors	71
2.9 Jumper Blocks	75
2.9.1 Front Panel Audio Connector/Jumper Block	75
2.9.2 BIOS Setup Configuration Jumper Block	76
2.10 Mechanical Considerations	77
2.10.1 D845BG Form Factor	77
2.10.2 D845PT Form Factor	78
2.10.3 I/O Shield	79
2.11 Electrical Considerations	82
2.11.1 Power Consumption	82
2.11.2 Add-in Board Considerations	82
2.11.3 Standby Current Requirements	83
2.11.4 Fan Connector Current Capability	84
2.11.5 Power Supply Considerations	84
2.12 Thermal Considerations	85
2.13 Reliability	87
2.14 Environmental	87
2.15 Regulatory Compliance	88
2.15.1 Safety Regulations	88
2.15.2 EMC Regulations	88
2.15.3 Product Certification Markings (Board Level)	89
3 Overview of BIOS Features	91
3.1 Introduction	91
3.2 BIOS Flash Memory Organization	92
3.3 Resource Configuration	92
3.3.1 PCI Autoconfiguration	92
3.3.2 PCI IDE Support	92
3.4 System Management BIOS (SMBIOS)	93
3.5 Legacy USB Support	93
3.6 BIOS Updates	94
3.6.1 Language Support	95
3.6.2 Custom Splash Screen	95
3.7 Recovering BIOS Data	95
3.8 Boot Options	96
3.8.1 CD-ROM and Network Boot	96
3.8.2 Booting Without Attached Devices	96
3.9 Fast Booting Systems with Intel Rapid BIOS Boot	96
3.9.1 Peripheral Selection and Configuration	96
3.9.2 Intel Rapid BIOS Boot	97
3.10 BIOS Security Features	98
4 BIOS Setup Program	99
4.1 Introduction	99
4.2 Maintenance Menu	100
4.2.1 Extended Configuration Submenu	101
4.3 Main Menu	102
4.4 Advanced Menu	103
4.4.1 PCI Configuration Submenu	104
4.4.2 Boot Configuration Submenu	105
4.4.3 Peripheral Configuration Submenu	106
4.4.4 IDE Configuration Submenu	108
4.4.5 Diskette Configuration Submenu	111
4.4.6 Event Log Configuration Submenu	112
4.4.7 Video Configuration Submenu	113
4.5 Security Menu	114
4.6 Power Menu	115
4.6.1 ACPI Submenu	116
4.7 Boot Menu	117
4.7.1 Boot Device Priority Submenu	118
4.7.2 Hard Disk Drives Submenu	119
4.7.3 Removable Devices Submenu	119
4.7.4 ATAPI CD-ROM Drives Submenu	120
4.8 Exit Menu	120
5 Error Messages and Beep Codes	121
5.1 BIOS Error Messages	121
5.2 Port 80h POST Codes	123
5.3 Bus Initialization Checkpoints	127
5.4 Speaker	128

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Intel Desktop Board D845BG/D845PT Technical Product Specification

1.14.2.4

Instantly Available PC Technology

CAUTION

For Instantly Available PC technology, 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 Instantly Available PC technology can damage the power supply.

Refer to

Section 2.11.3 on page 83 for additional information.

Instantly Available PC technology enables the D845BG and D845PT boards to enter the ACPI S3

(Suspend-to-RAM) sleep-state.

While in the S3 sleep-state, the computer will appear to be off (the

power supply is off, and the front panel LED is amber if dual colored, or off if single colored.)

When signaled by a wake-up device or event, the system quickly returns to its last known wake

state.

Table 10 on page 41 lists the devices and events that can wake the computer from the

S3 state.

The D845BG and D845PT boards support the

PCI Bus Power Management Interface

Specification

For information on the versions of this specification, see Section 1.5.

Add-in

boards that also support this specification can participate in power management and can be used to

wake the computer.

The use of Instantly Available PC technology requires operating system support and PCI 2.2

compliant add-in cards and drivers.

The standby power indicator LED shows that power is still present even when the computer

appears to be off.

Figure 10 shows the location of the standby power indicator LED.

CAUTION

If AC power has been switched off and the standby power indicator is still lit, disconnect the power

cord before installing or removing any devices connected to the board.

Failure to do so could

damage the board and any attached devices.

OM12987

CR3H1

Figure 10.

Location of the Standby Power Indicator LED