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Intel Desktop Board D845PEBT2 Technical Product Specification 2.11.3 Standby Current Requirements CAUTION If the standby current necessary to support multiple wake events from the PCI and/or USB buses exceeds power supply capacity, the Desktop Board D845PEBT2 may lose register settings stored in memory, etc. Calculate the standby current requirements using the steps described below. Power supplies used with the Desktop Board D845PEBT2 must be able to provide enough standby current to support the Instantly Available PC (ACPI S3 sleep state) configuration as outlined in Table 56 below. Values are determined by specifications such as PCI 2.2. Actual measured values may vary. To estimate the amount of standby current required for a particular system configuration, standby current requirements of all installed components must be added to determine the total standby current requirement. Refer to the descriptions in Table 56 and review the following steps. 1. Note the total Desktop Board D845PEBT2 standby current requirement. 2. Add to that the total PS/2 port standby current requirement if a wake-enabled device is connected. 3. Add, from the PCI 2.2 slots (wake enabled) row, the total number of wake-enabled devices installed (PCI and AGP) and multiply by the standby current requirement. 4. Add, from the PCI 2.2 slots (nonwake enabled) row, the total number of wake-enabled devices installed (PCI and AGP) and multiply by the standby current requirement. 5. Add all additional wake-enabled devices' and nonwake-enabled devices' standby current requirements as applicable. 6. Add all the required current totals from steps 1 through 5 to determine the total estimated standby current power supply requirement. Table 56. Standby Current Requirements Instantly Available PC Current Support (Estimated for Integrated Board Components) Instantly Available PC Stand-by Current Support • Estimated for add-on components • Add to Instantly Available PC total current requirement (See instructions above) Description Total for Desktop Board D845PEBT2 PS/2 ports(Note) PCI 2.2 slots (wake enabled) PCI 2.2 slots (nonwake enabled) CNR (Note) USB ports (Note) Note: Dependent upon system configuration Standby Current Requirements (mA) 220 345 375 80 375 500 80

Section	Page
Intel® Desktop Board D845PEBT2 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 Overview	12
1.1.1 Feature Summary	12
1.1.2 Manufacturing Options	13
1.1.3 Board Layout	14
1.1.4 Block Diagram	15
1.2 Online Support	16
1.3 Operating System Support	16
1.4 Design Specifications	17
1.5 Processor	20
1.6 System Memory	21
1.7 Intel® 845PE Chipset	23
1.7.1 AGP	24
1.7.2 USB	24
1.7.3 IDE Support	25
1.7.4 Real-Time Clock, CMOS SRAM, and Battery	26
1.7.5 Intel® 82802AB Firmware Hub (FWH)	26
1.8 IDE RAID Controller (Optional)	27
1.9 Serial ATA Controller (Optional)	27
1.10 I/O Controller	28
1.10.1 Serial Ports	28
1.10.2 Parallel Port	28
1.10.3 Diskette Drive Controller	28
1.10.4 Keyboard and Mouse Interface	29
1.11 IEEE 1394a-2000 Controller (Optional)	29
1.12 Audio Subsystem	30
1.12.1 6-Channel Audio Subsystem (Optional)	30
1.12.2 2-Channel Audio Subsystem (Optional)	31
1.12.3 Audio Connectors	32
1.12.4 Audio Subsystem Software	32
1.13 LAN Subsystem	33
1.13.1 Intel® 82562ET Physical Layer Interface Device	33
1.13.2 RJ-45 LAN Connector with Integrated LEDs	33
1.13.3 LAN Subsystem Software	34
1.14 CNR (Optional)	34
1.15 Hardware Management Subsystem	35
1.15.2 Fan Monitoring	36
1.15.3 Chassis Intrusion and Detection	37
1.16 Power Management	37
1.16.1 ACPI	38
1.16.2 Hardware Support	40
2 Technical Reference	45
2.1 Introduction	45
2.2 Memory Map	45
2.3 Fixed I/O Map	46
2.4 DMA Channels	47
2.5 PCI Configuration Space Map	47
2.6 Interrupts	48
2.7 PCI Interrupt Routing Map	49
2.8 Connectors	51
2.8.1 Back Panel Connectors	52
2.8.2 Internal I/O Connectors	56
2.8.3 External I/O Connectors	68
2.9 Jumper Blocks	72
2.9.1 Front Panel Audio Connector/Jumper Block	72
2.9.2 BIOS Setup Configuration Jumper Block	73
2.10 Mechanical Considerations	74
2.10.1 D845PEBT2 Form Factor	74
2.10.2 I/O Shield	76
2.11 Electrical Considerations	79
2.11.1 Power Consumption	79
2.11.2 Add-in Board Considerations	79
2.11.3 Standby Current Requirements	80
2.11.4 Fan Connector Current Capability	81
2.11.5 Power Supply Considerations	82
2.12 Thermal Considerations	83
2.13 Reliability	85
2.14 Environmental	85
2.15 Regulatory Compliance	86
2.15.1 Safety Regulations	86
2.15.2 EMC Regulations	86
2.15.3 Product Certification Markings (Board Level)	87
3 Overview of BIOS Features	89
3.1 Introduction	89
3.2 BIOS Flash Memory Organization	90
3.3 PCI Autoconfiguration	90
3.4 System Management BIOS (SMBIOS)	90
3.5 Legacy USB Support	91
3.6 BIOS Updates	91
3.6.1 Language Support	92
3.6.2 Custom Splash Screen	92
3.7 Recovering BIOS Data	92
3.8 Boot Options	93
3.8.1 CD-ROM Boot	93
3.8.2 Network Boot	93
3.8.3 Booting Without Attached Devices	93
3.9 Changing the Default Boot Device During POST	94
3.10 Fast Booting Systems with Intel® Rapid BIOS Boot	94
3.10.1 Peripheral Selection and Configuration	94
3.10.2 Intel Rapid BIOS Boot	95
3.11 BIOS Security Features	96
4 BIOS Setup Program	97
4.1 Introduction	97
4.2 Maintenance Menu	98
4.3 Main Menu	99
4.4 Advanced Menu	100
4.4.1 PCI Configuration Submenu	101
4.4.2 Boot Configuration Submenu	102
4.4.3 Peripheral Configuration Submenu	103
4.4.4 IDE Configuration Submenu	105
4.4.5 Diskette Configuration Submenu	107
4.4.6 Event Log Configuration Submenu	108
4.4.7 Video Configuration Submenu	109
4.4.8 USB Configuration Submenu	110
4.4.9 Chipset Configuration Submenu	111
4.4.10 Fan Control Configuration Submenu	112
4.5 Security Menu	113
4.6 Power Menu	114
4.6.1 ACPI Submenu	114
4.7 Boot Menu	115
4.7.1 Boot Device Priority Submenu	116
4.7.2 Hard Disk Drives Submenu	117
4.7.3 Removable Devices Submenu	117
4.7.4 ATAPI CD-ROM Drives Submenu	118
4.8 Exit Menu	118
5 Error Messages and Beep Codes	119
5.1 BIOS Error Messages	119
5.2 Port 80h POST Codes	121
5.3 Bus Initialization Checkpoints	125
5.4 Speaker	126

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Intel Desktop Board D845PEBT2 Technical Product Specification

2.11.3

Standby Current Requirements

CAUTION

If the standby current necessary to support multiple wake events from the PCI and/or USB buses

exceeds power supply capacity, the Desktop Board D845PEBT2 may lose register settings stored

in memory, etc.

Calculate the standby current requirements using the steps described below.

Power supplies used with the Desktop Board D845PEBT2 must be able to provide enough standby

current to support the Instantly Available PC (ACPI S3 sleep state) configuration as outlined in

Table 56 below.

Values are determined by specifications such as PCI 2.2.

Actual measured values may vary.

To estimate the amount of standby current required for a particular system configuration, standby

current requirements of all installed components must be added to determine the total standby

current requirement.

Refer to the descriptions in Table 56 and review the following steps.

Note the total Desktop Board D845PEBT2 standby current requirement.

Add to that the total PS/2 port standby current requirement if a wake-enabled device is

connected.

Add, from the PCI 2.2 slots (wake enabled) row, the total number of wake-enabled devices

installed (PCI and AGP) and multiply by the standby current requirement.

Add, from the PCI 2.2 slots (nonwake enabled) row, the total number of wake-enabled devices

installed (PCI and AGP) and multiply by the standby current requirement.

Add all additional wake-enabled devices

’

and nonwake-enabled devices

’

standby current

requirements as applicable.

Add all the required current totals from steps 1 through 5 to determine the total estimated

standby current power supply requirement.

Table 56.

Standby Current Requirements

Description

Standby Current

Requirements (mA)

Instantly Available PC Current

Support (Estimated for

Integrated Board Components)

Total for Desktop Board

D845PEBT2

220

PS/2 ports

(Note)

345

PCI 2.2 slots (wake enabled)

375

PCI 2.2 slots (nonwake enabled)

CNR

(Note)

375

Instantly Available PC Stand-by

Current Support

•

Estimated for add-on

components

•

Add to Instantly Available

PC total current

requirement

(See instructions above)

USB ports

(Note)

500

Note:

Dependent upon system configuration