Desktop Boards D845EBG2/D845EPT2 may contain design defects or errors known as errata that may cause the product to deviate from published specifications.

Current characterized errata are documented in the Intel Desktop Board D845EBG2/D845EPT2 Specification Update.

Desktop Board

April 2002

Order Number: A84913-001

Table of Contents

Summary of Contents for Intel D845EPT2

Page 1 Order Number: A84913-001 ® The Intel Desktop Boards D845EBG2/D845EPT2 may contain design defects or errors known as errata that may cause the product to deviate from published specifications. Current characterized errata are documented in the Intel Desktop Board D845EBG2/D845EPT2 Specification Update.
Page 2: Revision History
Intel products are not intended for use in medical, life saving, or life sustaining applications or for any other application in which the failure of the Intel product could create a situation where personal injury or death may occur.
Page 3: Intended Audience
The TPS is intended to provide detailed, technical information about the Desktop Boards D845EBG2 and D845EPT2 and their components to the vendors, system integrators, and other engineers and technicians who need this level of information. It is specifically not intended for general audiences.
Page 4 When used in the description of a component, N indicates component type, xn are the relative coordinates of its location on the Desktop Boards D845EBG2 and D845EPT2, and X is the instance of the particular part at that general location. For example, J5J1 is a connector, located at 5J.
Page 5: Table Of Contents
Board Layouts ....................14 1.2.4 Block Diagram....................16 Online Support ......................17 Operating System Support ..................17 Design Specifications ....................18 Processor ........................21 System Memory ......................22 ® Intel 845E Chipset ....................24 1.8.1 AGP ......................25 1.8.2 USB......................26 1.8.3 IDE Support ....................27 1.8.4 Real-Time Clock, CMOS SRAM, and Battery..........28 I/O Controller ......................28...
Page 6 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2 Technical Reference Introduction.........................47 Memory Map ......................47 Fixed I/O Map......................48 DMA Channels ......................49 PCI Configuration Space Map ..................49 Interrupts ........................50 PCI Interrupt Routing Map ..................51 Connectors .........................53 2.8.1 Back Panel Connectors................54 2.8.2 Internal I/O Connectors ................57 2.8.3...
Page 7 Bus Initialization Checkpoints ...................125 Speaker ........................126 BIOS Beep Codes ....................126 Figures Desktop Board D845EBG2 Components..............14 Desktop Board D845EPT2 Components ..............15 Block Diagram ......................16 Intel 845E Chipset Block Diagram ................24 USB Port Configuration ....................26 Audio Subsystem Block Diagram................30 ICH4 and CNR Signal Interface ..................33...
Page 8 Back Panel Connectors ....................54 Audio Connectors .......................58 Power and Hardware Control Connectors ..............60 D845EBG2 Add-in Board and Peripheral Interface Connectors........63 D845EPT2 Add-in Board and Peripheral Interface Connectors ........64 External I/O Connectors .....................70 Location of the Jumper Blocks..................74 Desktop Board D845EBG2 Dimensions ..............76 Desktop Board D845EPT2 Dimensions ..............77...
Page 9 BIOS Setup Configuration Jumper Settings..............75 Power Usage......................80 Standby Current Requirements ..................81 Fan Connector Current Capability ................82 Thermal Considerations for Components ..............84 Desktop Board D845EBG2/D845EPT2 Environmental Specifications ......85 Safety Regulations .....................86 EMC Regulations......................86 Supervisor and User Password Functions ..............96 BIOS Setup Program Menu Bar .................97 BIOS Setup Program Function Keys ................98...
Page 10 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Exit Menu .........................118 BIOS Error Messages....................119 Uncompressed INIT Code Checkpoints..............121 Boot Block Recovery Code Checkpoints ..............121 Runtime Code Uncompressed in F000 Shadow RAM ..........122 Bus Initialization Checkpoints ...................125 Upper Nibble High Byte Functions................125 Lower Nibble High Byte Functions................126...
Page 11: Product Description
• microATX Form Factor (9.60 inches by 8.20 inches) D845EPT2 • Three PCI bus connectors ✏ NOTE Most of the illustrations in this document show only the Desktop Board D845EPT2. When there are significant differences between the two Desktop Boards, illustrations of both boards are provided.
Page 12: Overview
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.2 Overview 1.2.1 Feature Summary Table 2 summarizes the major features of the Desktop Boards D845EBG2 and D845EPT2. Table 2. Feature Summary Form Factor D845EBG2: ATX (12.00 inches by 8.20 inches) D845EPT2: microATX (9.60 inches by 8.20 inches) •...
Page 13: Manufacturing Options
Section 1.5, page 18 1.2.2 Manufacturing Options Table 3 describes the manufacturing options on the Desktop Boards D845EBG2 and D845EPT2. Not every manufacturing option is available in all marketing channels. Please contact your Intel representative to determine which manufacturing options are available to you.
Page 14: Board Layouts
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.2.3 Board Layouts Figure 1 shows the location of the major components on the Desktop Board D845EBG2. OM14226 Audio codec (optional) IDE connectors Intel 82562ET PLC device (optional) Diskette drive connector AGP connector...
Page 15: Desktop Board D845Ept2 Components
Product Description Figure 2 shows the location of the major components on the Desktop Board D845EPT2. OM14236 Audio codec (optional) IDE connectors Intel 82562ET PLC device (optional) Diskette drive connector AGP connector 4 Mbit Firmware Hub (FWH) Back panel connectors...
Page 16: Block Diagram
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.2.4 Block Diagram Figure 3 is a block diagram of the major functional areas of the Desktop Boards D845EBG2 and D845EPT2. See Figure 5 on page 26 for USB port routing. = connector or socket Back Panel/...
Page 17: Online Support
Audio software and utilities http://www.intel.com/design/motherbd LAN software and drivers http://www.intel.com/design/motherbd 1.4 Operating System Support The Desktop Boards D845EBG2 and D845EPT2 support drivers for all of the onboard hardware and subsystems under the following operating systems: • † Microsoft Windows 98 SE •...
Page 18: Design Specifications
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.5 Design Specifications Table 4 lists the specifications applicable to the Desktop Boards D845EBG2 and D845EPT2. Table 4. Specifications Reference Specification Version, Revision Date, The information is Name Title and Ownership available from…...
Page 19 Revision 1.1, http://www.pcisig.com/ Management Interface December 18, 1998, specifications Specification PCI Special Interest Group. Plug and Plug and Play BIOS Version 1.0a, http://www.microsoft.com/ Play Specification May 5, 1994, hwdev/tech/PnP/ Compaq Computer Corporation, default.asp Phoenix Technologies Limited, and Intel Corporation. continued...
Page 20 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 4. Specifications (continued) Reference Specification Version, Revision Date The information is Name Title and Ownership available from… Preboot Execution Version 2.1, ftp://download.intel.com/ial/ Environment September 20, 1999, wfm/pxespec.pdf Intel Corporation. SFX/SFX12V Power Version 2.0, http://www.formfactors.org/...
Page 21: Processor
CAUTION Use of unsupported processors can damage the Desktop Board, the processor, and the power supply. See Intel’s World Wide Web site for the most up-to-date list of supported processors for Desktop Boards D845EBG2 and D845EPT2. Desktop Boards D845EBG2 and D845EPT2 support the following: •...
Page 22: System Memory
The Desktop Boards D845EBG2 and D845EPT2 have been designed to support DIMMs based on 512 Mbit technology for a maximum onboard capacity of up to 2 GB, but this technology has not been validated on this board. Please refer to the following Intel web sites for the latest lists of tested memory: For the Desktop Board D845EBG2: http://developer.intel.com/design/motherbd/bg2/bg2_mem.htm...
Page 23: Supported Memory Configurations
Product Description Table 5 lists the supported DIMM configurations. Table 5. Supported Memory Configurations DIMM Number of DDR SDRAM DDR SDRAM Organization Number of DDR (Note 1) Capacity Sides Density Front-side/Back-side SDRAM Devices 64 MB 64 Mbit 8 M x 8/empty 64 MB 128 Mbit 8 M x 16/empty...
Page 24: Intel ® 845E Chipset
1.8 Intel 845E Chipset The Intel 845E chipset consists of the following devices: • Intel 82845E Memory Controller Hub (MCH) with Accelerated Hub Architecture (AHA) bus • Intel 82801DB I/O Controller Hub (ICH4) with AHA bus • Firmware Hub (FWH) The MCH is a centralized controller for the system bus, the memory bus, the AGP bus, and the Accelerated Hub Architecture interface.
Page 25: Agp
Product Description 1.8.1 AGP The AGP connector supports AGP add-in cards with 1.5 V Switching Voltage Level (SVL). Legacy 3.3 V AGP cards are not supported. For information about Refer to The location of the AGP connector Figure 1, page 14 The signal names of the AGP connector Table 36, page 67 ✏...
Page 26: Usb
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.8.2 USB The Desktop Boards D845EBG2 and D845EPT2 support up to six USB 2.0 ports and fully support UHCI and EHCI and use UHCI- and EHCI-compatible drivers. For more than six USB devices, an external hub can be connected to any of the ports.
Page 27: Ide Support
The drive reports the transfer rate and translation mode to the BIOS. The Desktop Boards D845EBG2 and D845EPT2 support Laser Servo (LS-120) diskette technology through the IDE interfaces. An LS-120 drive can be configured as a boot device by setting the BIOS Setup program’s Boot menu to one of the following:...
Page 28: Real-Time Clock, Cmos Sram, And Battery
1.9.1 Serial Ports The Desktop Boards D845EBG2 and D845EPT2 have two serial port connectors. Serial port A is located on the back panel. Serial port B is accessible using a connector located near the main power connector. The serial ports support data transfers at speeds up to 115.2 kbits/sec with BIOS support.
Page 29: Parallel Port
Product Description 1.9.2 Parallel Port The 25-pin D-Sub parallel port connector is located on the back panel. Use the BIOS Setup program to set the parallel port mode. For information about Refer to The location of the parallel port connector Figure 10, page 54 The signal names of the parallel port connector Table 20, page 55...
Page 30: Audio Subsystem (Optional)
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.10 Audio Subsystem (Optional) The audio subsystem consists of the following devices: • Intel 82801DB I/O Controller Hub (ICH4) • Analog Devices AD1981A audio codec (optional) The audio subsystem includes these features: •...
Page 31: Audio Connectors
Figure 11, page 58 The signal names of the ATAPI CD-ROM connector Table 27, page 59 1.10.2 Audio Subsystem Software Audio software and drivers are available from Intel’s World Wide Web site. For information about Refer to Obtaining audio software and drivers...
Page 32: Lan Subsystem (Optional)
® 82562ET Platform LAN Connect Device The Intel 82562ET component provides an interface to the back panel RJ-45 connector with integrated LEDs. This physical interface may alternately be provided through the CNR connector. The Intel 82562ET provides the following functions: •...
Page 33: Lan Subsystem Software
1.12 CNR (Optional) The Communication and Networking Riser (CNR) connector provides an interface that supports the audio, modem, and LAN interfaces of the Intel 845E chipset. Figure 7 shows the signal interface between the riser and the ICH4. Communication and AC ’97 Interface...
Page 34: Hardware Management Subsystem
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification ✏ NOTE The brand and type of audio codec used on the CNR card must match that of the Desktop Boards’ codec (Analog Devices AD1981A). ✏ NOTE Check with your CNR vendor to ensure that the CNR card has been tested with ICH4-based systems.
Page 35: Hardware Monitoring Asics
A hardware monitoring ASIC • A hardware monitoring and fan control ASIC The features of these components are described in this section. Contact your Intel sales representative to determine which type of hardware monitoring ASIC is present on your Intel Desktop Board.
Page 36: Fan Monitoring
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.13.1.3 Thermal Monitoring Figure 8 shows the location of the sensors and fan connectors. OM14244 OM14387 Thermal diode, located on processor die Ambient temperature sensor, internal to both hardware monitoring ASIC options (Note)
Page 37: Chassis Intrusion And Detection
Product Description 1.13.3 Chassis Intrusion and Detection The Desktop Boards D845EBG2 and D845EPT2 support a chassis security feature that detects if the chassis cover is removed. For the chassis intrusion circuit to function, the chassis’ power supply must be connected to AC power. The security feature uses a mechanical switch on the chassis that attaches to the chassis intrusion connector.
Page 38: Acpi
ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with the Desktop Boards D845EBG2 and D845EPT2 requires an operating system that provides full ACPI support. ACPI features include: •...
Page 39: Power States And Targeted System Power
The operating system uses information from applications and user settings to put the system as a whole into a low-power state. Table 8 lists the power states supported by the Desktop Boards D845EBG2 and D845EPT2 along with the associated system power targets. See the ACPI specification for a complete description of the various system and power states.
Page 40: Hardware Support
The total amount of standby current required depends on the wake devices supported and manufacturing options. Refer to Section 2.11.3 on page 81 for additional information. The Desktop Boards D845EBG2 and D845EPT2 provide several power management hardware features, including: •...
Page 41: Fan Connector Function/Operation For Desktop Boards With A Hardware Monitoring Asic
Product Description Resume on Ring enables telephony devices to access the computer when it is in a power-managed state. The method used depends on the type of telephony device (external or internal). ✏ NOTE The use of Resume on Ring and Wake from USB technologies from an ACPI state requires an operating system that provides full ACPI support.
Page 42: Fan Connector Function/Operation For Desktop Boards With A Hardware Monitoring And Fan Control Asic
LAN subsystem asserts a wake-up signal that powers up the computer. Depending on the LAN implementation, the Desktop Boards D845EBG2 and D845EPT2 support LAN wake capabilities with ACPI in the following ways: • The PCI bus PME# signal for PCI 2.2 compliant LAN designs •...
Page 43 Instantly Available PC technology can damage the power supply. Refer to Section 2.11.3 on page 81 for additional information. Instantly Available PC technology enables the Desktop Boards D845EBG2 and D845EPT2 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...
Page 44: Location Of The Standby Power Indicator Led
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 1.14.2.5 +5 V Standby Power Indicator LED The +5 V standby power indicator LED shows that power is still present even when the computer appears to be off. Figure 9 shows the location of the standby power indicator LED.
Page 45 Product Description 1.14.2.7 Wake from USB USB bus activity wakes the computer from ACPI S1 or S3 states. ✏ NOTE Wake from USB requires the use of a USB peripheral that supports Wake from USB. 1.14.2.8 Wake from PS/2 Devices PS/2 device activity wakes the computer from an ACPI S1 or S3 state.
Page 46 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification...
Page 47: Technical Reference
2 Technical Reference What This Chapter Contains Introduction.........................47 Memory Map ......................47 Fixed I/O Map......................48 DMA Channels ......................49 PCI Configuration Space Map ..................49 Interrupts ........................50 PCI Interrupt Routing Map ..................51 Connectors .........................53 Jumper Blocks......................74 2.10 Mechanical Considerations..................76 2.11 Electrical Considerations ....................80 2.12 Thermal Considerations....................83 2.13 Reliability ........................85 2.14 Environmental ......................85...
Page 48: Fixed I/O Map
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.3 Fixed I/O Map Table 13. I/O Map Address (hex) Size Description 0000 - 00FF 256 bytes Used by the Desktop Board D845EBG2/D845EPT2. Refer to the ICH4 data sheet for dynamic addressing information.
Page 49: Dma Channels
Number (hex) Description Memory controller of Intel 82845E component Host to AGP bridge (virtual P2P) Hub link to PCI bridge Intel 82801DB ICH4 PCI to LPC bridge IDE controller SMBus controller AC ’97 audio controller AC ’97 modem controller (optional)
Page 50: Interrupts
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.6 Interrupts The interrupts can be routed through either the Programmable Interrupt Controller (PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the ICH4 component. The PIC is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts. The APIC is supported in Windows 2000 and Windows XP and supports a total of 24 interrupts.
Page 51: Pci Interrupt Routing Map
PCI add-in card connect to one of these PIRQ signals. Some PCI interrupt sources are electrically tied together on the Desktop Boards D845EBG2 and D845EPT2 and therefore share the same interrupt. Table 17 shows an example of how the PIRQ signals are routed.
Page 52: Pci Interrupt Routing Map
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 17. PCI Interrupt Routing Map ICH4 PIRQ Signal Name PCI Interrupt Source PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH AGP connector INTA INTB ICH4 USB UHCI controller 1 INTA SMBus controller...
Page 53: Connectors
Only the back panel USB, front panel USB, VGA, and PS/2 connectors of the Desktop Boards D845EBG2 and D845EPT2 have overcurrent protection. The Desktop Boards’ internal connectors are not overcurrent protected and should connect only to devices inside the computer’s chassis, such as fans and internal peripherals.
Page 54: Back Panel Connectors
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.8.1 Back Panel Connectors Figure 10 shows the location of the back panel connectors. The back panel connectors are color-coded in compliance with PC 99 recommendations. The figure legend below lists the colors used.
Page 55: Ps/2 Mouse/Keyboard Connector
Technical Reference Table 18. PS/2 Mouse/Keyboard Connector Signal Name Data Not connected Ground +5 V (Fused) Clock Not connected Table 19. USB Connectors Signal Name +5 V (Fused) USB# Ground Table 20. Parallel Port Connector Standard Signal Name ECP Signal Name EPP Signal Name STROBE# STROBE#...
Page 56: Serial Port A Connector
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 21. Serial Port A Connector Signal Name DCD (Data Carrier Detect) RXD# (Receive Data) TXD# (Transmit Data) DTR (Data Terminal Ready) Ground DSR (Data Set Ready) RTS (Request to Send) CTS (Clear to Send) RI (Ring Indicator) Table 22.
Page 57: Internal I/O Connectors
Desktop Board. • One CNR (optional), shared with PCI bus connector 3 (ATX expansion slot 1) on the Desktop Board D845EPT2 or with PCI bus connector 6 (ATX expansion slot 1) on the Desktop Board D845EBG2. ✏...
Page 58: Audio Connectors
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.8.2.2 Audio Connectors Figure 11 shows the location of the audio connectors. OM14239 Item Description Color For more information see: Auxiliary line in, ATAPI style White Table 26 ATAPI CD-ROM Black Table 27 Figure 11.
Page 59: Auxiliary Line In Connector
Technical Reference Table 26. Auxiliary Line In Connector Signal Name Left auxiliary line in Ground Ground Right auxiliary line in Table 27. ATAPI CD-ROM Connector Signal Name Left audio input from CD-ROM CD audio differential ground CD audio differential ground Right audio input from CD-ROM...
Page 60: Power And Hardware Control Connectors
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.8.2.3 Power and Hardware Control Connectors Figure 12 shows the location of the power and hardware control connectors. OM14240 Item Description For more information see: +12 V power connector (ATX12V) Table 28 Rear chassis fan...
Page 61: Atx12V Power Connector
NOTE Use only ATX12V-compliant power supplies with the Desktop Board D845EBG2 and only ATX12V- or SFX12V-compliant power supplies with the Desktop Board D845EPT2. ATX12V and SFX12V power supplies have an additional power lead that provides required supplemental power for the processor. Always connect the 20-pin and 4-pin leads of ATX12V and SFX12V power supplies to the corresponding connectors on the Desktop Boards D845EBG2 and D845EPT2, otherwise the Desktop Board will not boot.
Page 62: Main Power Connector
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 31. Main Power Connector Signal Name Signal Name +3.3 V +3.3 V +3.3 V -12 V Ground Ground +5 V PS-ON# (power supply remote on/off) Ground Ground +5 V Ground Ground Ground...
Page 63: D845Ebg2 Add-In Board And Peripheral Interface Connectors
Technical Reference 2.8.2.4 Add-in Board and Peripheral Interface Connectors Figure 13 shows the location of the add-in board connector and peripheral connectors for the Desktop Board D845EBG2. Note the following considerations for the PCI bus connectors (for both Desktop Boards): •...
Page 64: D845Ept2 Add-In Board And Peripheral Interface Connectors
PCI bus connector 2 Table 35 PCI bus connector 1 Table 35 AGP connector Table 36 Diskette drive Table 37 Primary IDE Table 38 Secondary IDE Table 38 SCSI LED Table 39 Figure 14. D845EPT2 Add-in Board and Peripheral Interface Connectors...
Page 65: Cnr Connector (Optional)
Technical Reference Table 34. CNR Connector (Optional) Signal Name Signal Name Reserved Reserved Reserved Reserved Ground Reserved Reserved Ground Reserved Reserved Ground Reserved LAN_TXD2 Ground LAN_TXD0 LAN_TXD1 Ground LAN_RSTSYNC LAN_CLK Ground LAN_RXD1 LAN_RXD2 Reserved LAN_RXD0 USB+ Ground Ground Reserved USB- +5 V (dual) +12 V USB_OC...
Page 66: Pci Bus Connectors
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 35. PCI Bus Connectors Signal Name Signal Name Signal Name Signal Name Ground (TRST#)* -12 V AD16 AD17 +12 V Ground (TCK)* +3.3 V C/BE2# +5 V (TMS)* Ground FRAME# Ground +5 V (TDI)*...
Page 67: Agp Connector
Technical Reference Table 36. AGP Connector Signal Name Signal Name Signal Name Signal Name +12 V Not connected A34 Vddq Vddq TYPEDET# +5 V AD22 AD21 Reserved +5 V AD20 AD19 Not connected Not connected A37 Ground Ground Ground Ground AD18 AD17 INTA#...
Page 68: Diskette Drive Connector
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 37. Diskette Drive Connector Signal Name Signal Name Ground DENSEL Not connected DRVDEN1 Ground FDINDX# Ground MTR0# (Motor Enable A) Ground Not connected Ground DS0# (Drive Select A) Ground Not connected Not connected...
Page 69: Pci Ide Connectors
Technical Reference Table 38. PCI IDE Connectors Signal Name Signal Name Reset IDE Ground Data 7 Data 8 Data 6 Data 9 Data 5 Data 10 Data 4 Data 11 Data 3 Data 12 Data 2 Data 13 Data 1 Data 14 Data 0 Data 15...
Page 70: External I/O Connectors
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.8.3 External I/O Connectors Figure 15 shows the locations of the external I/O connectors. OM14242 Item Description For more information see: Front panel audio Table 40 Serial port B Table 41 Auxiliary front panel power/sleep/message-waiting LED...
Page 71: Front Panel Audio Connector
Technical Reference Table 40. Front Panel Audio Connector Signal Name Signal Name MIC_IN_FP Ground MIC_BIAS V_5P0_AUD_ANALOG R_FNTOUT R_RETIN Ground L_FNT_OUT L_RETIN ✏ NOTE The front panel audio connector is alternately used as a jumper block for routing audio signals. Refer to Section 2.9.1 on page 74 for more information. Table 41.
Page 72: Front Panel Connector
2.8.3.2.2 Reset Switch Connector Pins 5 and 7 can be connected to a momentary SPST type switch that is normally open. When the switch is closed, the Desktop Board D845EBG2/D845EPT2 resets and runs the POST. 2.8.3.2.3 Power/Sleep/Message Waiting LED Connector Pins 2 and 4 can be connected to a one- or two-color LED.
Page 73: States For A Two-Color Power Led
SW_ON# pin to ground for at least 50 ms to signal the power supply to switch on or off. (The time requirement is due to internal debounce circuitry on the Desktop Board D845EBG2/D845EPT2.) At least two seconds must pass before the power supply will recognize another on/off signal.
Page 74: Jumper Blocks
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.9 Jumper Blocks CAUTION Do not move any jumpers with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the Desktop Board could be damaged.
Page 75: Bios Setup Configuration Jumper Block
Technical Reference CAUTION Do not place jumpers on this block in any configuration other than the one described in Table 47. Other jumper configurations are not supported and could damage the Desktop Board. Table 47. Front Panel Audio Connector/Jumper Block Jumper Setting Configuration Audio line out signals are routed to the back panel audio line out...
Page 76: Mechanical Considerations
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.10 Mechanical Considerations 2.10.1 D845EBG2 Form Factor The Desktop Board D845EBG2 is designed to fit into an ATX-form-factor chassis. Figure 17 illustrates the mechanical form factor for the Desktop Board D845EBG2. Dimensions are given in inches [millimeters].
Page 77: D845Ept2 Form Factor
Technical Reference 2.10.2 D845EPT2 Form Factor The Desktop Board D845EPT2 is designed to fit into either a microATX or an ATX-form-factor chassis. Figure 18 illustrates the mechanical form factor for the Desktop Board D845EPT2. Dimensions are given in inches [millimeters]. The outer dimensions are 9.60 inches by 8.20 inches [243.84 millimeters by 208.28 millimeters].
Page 78: I/O Shield
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 2.10.3 I/O Shield The back panel I/O shield for the Desktop Boards D845EBG2 and D845EPT2 must meet specific dimension and material requirements. Systems based on these Desktop Boards need the back panel I/O shield to pass certification testing. Figures 19 and 20 show the critical dimensions of the two types of chassis-dependent I/O shields for the Desktop Boards.
Page 79: I/O Shield Dimensions (For Desktop Boards With No Lan Subsystem)
Technical Reference 6.390 Ref [162.300] 0.063±0.005 [1.600±0.120] 0.787±0.010 TYP [20±0.254] 3x Dia 0.330 [8.380] 0.039 Dia. [1.000] 8X R0.5 MIN 0.884 [22.450] 0.519 [13.190] 0.276 0.027 [7.012] [0.690] 1.89 0.00 0.465 [11.811] 0.465 [11.811] 0.567 [14.400] 0.567 [14.400] 0.621 [15.770] Pictorial View OM12868...
Page 80: Electrical Considerations
The system running a graphics-intensive benchmark when the measurements in the ACPI S0 row were taken. 2.11.2 Add-in Board Considerations The Desktop Boards D845EBG2 and D845EPT2 are designed to provide 2 A (average) of +5 V current for each add-in board. The total +5 V current draw for add-in boards is as follows: •...
Page 81: Standby Current Requirements
Calculate the standby current requirements using the steps described below. Power supplies used with the Desktop Boards D845EBG2 and D845EPT2 must be able to provide enough standby current to support the Instantly Available PC (ACPI S3 sleep state) configuration as outlined in Table 50 below.
Page 82: Fan Connector Current Capability
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification ✏ NOTE IBM PS/2 Port Specification (Sept 1991) states: • 275 mA for keyboard • 70 mA for the mouse (nonwake-enable device) PCI/AGP requirements are calculated by totaling the following: • One wake-enabled device @ 375 mA, plus •...
Page 83: Power Supply Considerations
System integrators should refer to the power usage values listed in Table 49 when selecting a power supply for use with the Desktop Board D845EBG2 or D845EPT2. Measurements account only for current sourced by the Desktop Board D845EBG2 or D845EPT2 while running in idle modes of the started operating systems.
Page 84: Localized High Temperature Zones
Intel 82801DB ICH4 Figure 21. Localized High Temperature Zones Table 52 provides maximum case temperatures for the Desktop Board D845EBG2/D845EPT2 components that are sensitive to thermal changes. The operating temperature, current load, or operating frequency could affect case temperatures. Maximum case temperatures are important when considering proper airflow to cool the Desktop Board D845EBG2/D845EPT2.
Page 85: Reliability
The MTBF data is calculated from predicted data at 55 ºC. The MTBF calculations for the Desktop Boards are as follows: • Desktop Board D845EBG2 MTBF: 83,579.89402 hours • Desktop Board D845EPT2 MTBF: 85,468.91666 hours 2.14 Environmental Table 53 lists the environmental specifications for the Desktop Boards D845EBG2 and D845EPT2. Table 53.
Page 86: Regulatory Compliance
This section describes the Desktop Boards’ compliance with U.S. and international safety and electromagnetic compatibility (EMC) regulations. 2.15.1 Safety Regulations Table 54 lists the safety regulations the Desktop Boards D845EBG2 and D845EPT2 comply with when correctly installed in a compatible host system. Table 54.
Page 87: Product Certification Markings (Board Level)
• UL joint US/Canada Recognized Component mark: Consists of lower case c followed by a stylized backward UR and followed by a small US. Includes adjacent UL file number for Intel Desktop Boards: E210882 (component side). • FCC Declaration of Conformity logo mark for Class B equipment; to include Intel name and D845EBG2 and D845EPT2 model designation (solder side).
Page 88 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification...
Page 89: Overview Of Bios Features
3.10 BIOS Security Features....................96 3.1 Introduction The Desktop Boards D845EBG2 and D845EPT2 use an Intel/AMI BIOS that is stored in the Firmware Hub (FWH) and can be updated using a disk-based program. The FWH contains the BIOS Setup program, POST, the PCI auto-configuration utility, and Plug and Play support.
Page 90: Bios Flash Memory Organization
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 3.2 BIOS Flash Memory Organization The Firmware Hub (FWH) includes a 4 Mbit (512 KB) symmetrical flash memory device. Internally, the device is grouped into eight 64-KB blocks that are individually erasable, lockable, and unlockable.
Page 91: System Management Bios (Smbios)
Overview of BIOS Features 3.4 System Management BIOS (SMBIOS) SMBIOS is a Desktop Management Interface (DMI) compliant method for managing computers in a managed network. The main component of SMBIOS is the Management Information Format (MIF) database, which contains information about the computing system and its components. Using SMBIOS, a system administrator can obtain the system types, capabilities, operational status, and installation dates for system components.
Page 92: Bios Updates
Legacy USB support is for keyboards, mice, and hubs only. Other USB devices are not supported in legacy mode. 3.6 BIOS Updates The BIOS can be updated using either of the following utilities, which are available on the Intel World Wide Web site: •...
Page 93: Language Support
During POST, an Intel splash screen is displayed by default. This splash screen can be replaced with a custom splash screen. A utility is available from Intel to assist with creating a custom splash screen. The custom splash screen can be programmed into the flash memory using the BIOS upgrade utility.
Page 94: Boot Options
These factors affect system boot speed: • Selecting and configuring peripherals properly • ® Using an optimized BIOS, such as the Intel Rapid BIOS 3.9.1 Peripheral Selection and Configuration The following techniques help improve system boot speed: • Choose a hard drive with parameters such as “power-up to data ready” less than eight seconds, that minimize hard drive startup delays.
Page 95: Intel Rapid Bios Boot
It is possible to optimize the boot process to the point where the system boots so quickly that the Intel logo screen (or a custom logo splash screen) will not be seen. Monitors and hard disk drives with minimum initialization times can also contribute to a boot time that might be so fast that necessary logo screens and POST messages cannot be seen.
Page 96: Bios Security Features
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 3.10 BIOS Security Features The BIOS includes security features that restrict access to the BIOS Setup program and who can boot the computer. A supervisor password and a user password can be set for the BIOS Setup program and for booting the computer, with the following restrictions: •...
Page 97: Bios Setup Program
4 BIOS Setup Program What This Chapter Contains Introduction.........................97 Maintenance Menu .....................98 Main Menu........................99 Advanced Menu......................100 Security Menu ......................113 Power Menu ......................114 Boot Menu ........................115 Exit Menu .........................118 4.1 Introduction The BIOS Setup program can be used to view and change the BIOS settings for the computer. The BIOS Setup program is accessed by pressing the <F2>...
Page 98: Maintenance Menu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 58 lists the function keys available for menu screens. Table 58. BIOS Setup Program Function Keys BIOS Setup Program Function Key Description <←> or <→> Selects a different menu screen (Moves the cursor left or right) <↑>...
Page 99: Main Menu
BIOS Setup Program 4.3 Main Menu To access this menu, select Main on the menu bar at the top of the screen. Maintenance Advanced Security Power Boot Exit Main Table 60 describes the Main menu. This menu reports processor and memory information and is for configuring the system date and system time.
Page 100: Advanced Menu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.4 Advanced Menu To access this menu, select Advanced on the menu bar at the top of the screen. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration...
Page 101: Pci Configuration Submenu
BIOS Setup Program 4.4.1 PCI Configuration Submenu To access this submenu, select Advanced on the menu bar and then PCI Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...
Page 102: Boot Configuration Submenu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 62. PCI Configuration Submenu (continued) Feature Options Description • Auto (default) PCI Slot6 IRQ Priority Allows selection of IRQ priority for PCI bus connector 6. • 5 (Note 1, Note 2) • 9 •...
Page 103: Peripheral Configuration Submenu
BIOS Setup Program 4.4.3 Peripheral Configuration Submenu To access this submenu, select Advanced on the menu bar and then Peripheral Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...
Page 104 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 64. Peripheral Configuration Submenu (continued) Feature Options Description • Disabled Parallel port Configures the parallel port. • Enabled Auto assigns LPT1 the address 378h and the interrupt IRQ7. • Auto (default) An * (asterisk) displayed next to an address indicates a conflict with another device.
Page 105: Ide Configuration Submenu
BIOS Setup Program 4.4.4 IDE Configuration Submenu To access this submenu, select Advanced on the menu bar and then IDE Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...
Page 106: Primary/Secondary Ide Master/Slave Submenus
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.4.4.1 Primary/Secondary IDE Master/Slave Submenus To access these submenus, select Advanced on the menu bar, then IDE Configuration, and then the master or slave to be configured. Maintenance Main Security Power Boot Exit...
Page 107 BIOS Setup Program Table 66. Primary/Secondary IDE Master/Slave Submenus (continued) Feature Options Description • Auto (default) Specifies the DMA mode for the drive. DMA Mode • SWDMA0 Auto = Auto-detected • SWDMA1 SWDMAn = Single Word DMAn • SWDMA2 SWDMAn = Multi Word DMAn •...
Page 108: Diskette Configuration Submenu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.4.5 Diskette Configuration Submenu To access this menu, select Advanced on the menu bar and then Diskette Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration...
Page 109: Event Log Configuration Submenu
BIOS Setup Program 4.4.6 Event Log Configuration Submenu To access this menu, select Advanced on the menu bar and then Event Log Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration...
Page 110: Video Configuration Submenu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.4.7 Video Configuration Submenu To access this menu, select Advanced on the menu bar and then Video Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration...
Page 111: Usb Configuration Submenu
BIOS Setup Program 4.4.8 USB Configuration Submenu To access this menu, select Advanced on the menu bar and then USB Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...
Page 112: Chipset Configuration Submenu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.4.9 Chipset Configuration Submenu To access this menu, select Advanced on the menu bar and then Chipset Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration...
Page 113: Security Menu
BIOS Setup Program Table 71. Primary/Secondary IDE Master/Slave Submenus (continued) Feature Options Description • 7 SDRAM RAS# Active to Corresponds to tRAS. Precharge • 6 • 5 (default) • 2.5 SDRAM CAS# Latency Selects the number of clock cycles required to address a column in memory.
Page 114: Power Menu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.6 Power Menu To access this menu, select Power from the menu bar at the top of the screen. Maintenance Main Advanced Security Boot Exit Power ACPI The menu represented in Table 73 is for setting the power management features.
Page 115: Boot Menu
Disables/enables PXE boot to LAN. (default) Note: When set to Enabled, you must reboot for the • Enabled Intel Boot Agent device to be available in the Boot Device menu. • Disabled USB Boot Disables/enables booting to USB boot devices.
Page 116: Boot Device Priority Submenu
The default settings for the first through fourth boot devices are, respectively: • Removable Dev. • Hard Drive • ATAPI CD-ROM • Intel Boot Agent Note: The boot device identifier for Intel Boot Agent (IBA) may vary depending on the BIOS release.
Page 117: Hard Disk Drives Submenu
BIOS Setup Program 4.7.2 Hard Disk Drives Submenu To access this menu, select Boot on the menu bar and then Hard Disk Drives. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The submenu represented in Table 77 is for setting hard disk drive priority.
Page 118: Atapi Cd-Rom Drives Submenu
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification 4.7.4 ATAPI CD-ROM Drives Submenu To access this menu, select Boot on the menu bar and then ATAPI CD-ROM Drives. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives...
Page 119: Error Messages And Beep Codes
5 Error Messages and Beep Codes What This Chapter Contains BIOS Error Messages....................119 Port 80h POST Codes....................121 Bus Initialization Checkpoints ...................125 Speaker ........................126 BIOS Beep Codes ....................126 5.1 BIOS Error Messages Table 81 lists the error messages and provides a brief description of each. Table 81.
Page 120 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 81. BIOS Error Messages (continued) Error Message Explanation Checking NVRAM..NVRAM is being checked to see if it is valid. Update OK! NVRAM was invalid and has been updated. Updated Failed NVRAM was invalid but was unable to be updated.
Page 121: Port 80H Post Codes
F000:0000 in Shadow RAM and give control to recovery code in F000 Shadow RAM. Initialize interrupt vector tables, initialize system timer, initialize DMA controller and interrupt controller. Initialize extra (Intel Recovery) Module. Initialize floppy drive. Try to boot from floppy. If reading of boot sector is successful, give control to boot sector code.
Page 122: Runtime Code Uncompressed In F000 Shadow Ram
Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 84. Runtime Code Uncompressed in F000 Shadow RAM Code Description of POST Operation NMI is Disabled. To check soft reset/power-on. BIOS stack set. Going to disable cache if any. POST code to be uncompressed.
Page 123 Error Messages and Beep Codes Table 84. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation To prepare the descriptor tables. To enter in virtual mode for memory test. To enable interrupts for diagnostics mode. To initialize data to check memory wrap around at 0:0. Data initialized.
Page 124 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification Table 84. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation Lock-key checking over. To check for memory size mismatch with CMOS. Memory size check done. To display soft error and check for password or bypass setup.
Page 125: Bus Initialization Checkpoints
Error Messages and Beep Codes Table 84. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation Uncompress SMBIOS module and init SMBIOS code and form the runtime SMBIOS image in shadow. Going to copy any code to specific area. Copying of code to specific area done.
Page 126: Speaker
PCI devices 5.4 Speaker A 47 Ω inductive speaker is mounted on the Desktop Board D845EBG2 and the Desktop Board D845EPT2. The speaker provides audible error code (beep code) information during POST. For information about Refer to The location of the onboard speaker on the Desktop Board D845EBG2...
Page 127: Beep Codes
Error Messages and Beep Codes If POST completes normally, the BIOS issues one short beep before passing control to the operating system. Table 88. Beep Codes Beep Description Refresh failure Parity cannot be reset First 64 KB memory failure Timer not operational Not used 8042 GateA20 cannot be toggled Exception interrupt error...
Page 128 Intel Desktop Board D845EBG2/D845EPT2 Technical Product Specification...

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