Intel BLKDG41MJ, DG41MJ Technical Product Specification
Intel® Desktop Board
DG41MJ
Technical Product Specification
The Intel® Desktop Board DG41MJ 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 DG41MJ Specification Update.
March 2009
Order Number: E62863-001US
Revision History
Revision Revision History Date
-001
First release of the Intel
Specification
This product specification applies to only the standard Intel® Desktop Board DG41MJ with BIOS
identifier MJG4110H.86A.
Changes to this specification will be published in the Intel Desktop Board DG41MJ Specification
Update before being incorporated into a revision of this document.
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WHICH THE FAILURE OF THE INTEL PRODUCT COULD CREATE A SITUATION WHERE PERSONAL INJURY OR
DEATH MAY OCCUR.
®
Desktop Board DG41MJ Technical Product
March 2009
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intellectual property rights that relate to the presented subject matter. The furnishing of documents and
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or “undefined.” Intel reserves these for future definition and shall have no responsibility whatsoever for
conflicts or incompatibilities arising from future changes to them.
®
desktop boards may contain design defects or errors known as errata, which may cause the product
Intel
to deviate from published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your
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Copyright © 2009, Intel Corporation. All rights reserved.
Preface
This Technical Product Specification (TPS) specifies the board layout, components,
connectors, power and environmental requirements, and the BIOS for the Intel
Desktop Board DG41MJ. It describes the standard product and available
manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Intel Desktop
Board DG41MJ and its 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.
What This Document Contains
®
Chapter Description
1 A description of the hardware used on the board
2 A map of the resources of the board
3 The features supported by the BIOS Setup program
4 A description of the BIOS error messages, beep codes, and POST codes
5 Regulatory compliance and battery disposal information
Typographical Conventions
This section contains information about the conventions used in this specification. Not
all of these symbols and abbreviations appear in all specifications of this type.
Notes, Cautions, and Warnings
#
NOTE
Notes call attention to important information.
INTEGRATOR’S NOTES
Integrator’s notes are used to call attention to information that may be useful to
system integrators.
CAUTION
Cautions are included to help you avoid damaging hardware or losing data.
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Intel Desktop Board DG41MJ Technical Product Specification
Other Common Notation
# Used after a signal name to identify an active-low signal (such as USBP0#)
GB Gigabyte (1,073,741,824 bytes)
GB/sec Gigabytes per second
Gbit Gigabit (1, 073,741,824 bits)
KB Kilobyte (1024 bytes)
Kbit Kilobit (1024 bits)
kbits/sec 1000 bits per second
MB Megabyte (1,048,576 bytes)
MB/sec Megabytes per second
Mbit Megabit (1,048,576 bits)
Mbit/sec Megabits per second
xxh An address or data value ending with a lowercase h indicates a hexadecimal value.
x.x V Volts. Voltages are DC unless otherwise specified.
* This symbol is used to indicate third-party brands and names that are the property of their
respective owners.
iv
Contents
1 Product Description9
1.1 Overview.......................................................................................... 9
1.1.1 Feature Summary .................................................................. 9
1.1.2 Board Layout ....................................................................... 11
1.1.3 Block Diagram ..................................................................... 13
1.2 Legacy Considerations...................................................................... 14
1.3 Online Support................................................................................ 14
1.4 Processor ....................................................................................... 14
1.5 System Memory .............................................................................. 15
1.5.1 Memory Configurations ......................................................... 16
1.6 Intel® G41 Express Chipset............................................................... 18
1.6.1 Intel G41 Graphics Subsystem ............................................... 18
1.6.2 USB ................................................................................... 20
1.6.3 Serial ATA Interfaces ............................................................ 20
1.7 Real-Time Clock Subsystem .............................................................. 21
1.8 Legacy I/O Controller ....................................................................... 21
1.8.1 Serial Port Interface.............................................................. 21
1.8.2 PS/2 Keyboard Interface ....................................................... 22
1.9 Audio Subsystem............................................................................. 22
1.9.1 Audio Subsystem Software .................................................... 23
1.9.2 Audio Connectors and Headers ............................................... 23
1.10 LAN Subsystem............................................................................... 24
1.10.1 LAN Subsystem Software....................................................... 24
1.10.2 RJ-45 LAN Connector with Integrated LEDs .............................. 25
1.11 Hardware Management Subsystem .................................................... 26
1.11.1 Hardware Monitoring and Fan Control...................................... 26
1.11.2 Fan Monitoring..................................................................... 26
1.11.3 Chassis Intrusion and Detection.............................................. 26
1.11.4 Thermal Monitoring .............................................................. 27
1.12 Power Management ......................................................................... 28
1.12.1 ACPI................................................................................... 28
1.12.2 Hardware Support ................................................................ 31
1.12.3 ENERGY STAR* .................................................................... 34
2 Technical Reference
2.1 Memory Map................................................................................... 35
2.1.1 Addressable Memory............................................................. 35
2.2 Connectors and Headers................................................................... 38
2.2.1 Back Panel Connectors .......................................................... 39
2.2.2 Component-side Connectors and Headers ................................ 40
2.3 Jumper Block .................................................................................. 48
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Intel Desktop Board DG41MJ Technical Product Specification
2.4 Mechanical Considerations ................................................................ 50
2.4.1 Form Factor......................................................................... 50
2.5 Electrical Considerations ................................................................... 51
2.5.1 Power Supply Considerations ................................................. 51
2.5.2 Fan Header Current Capability................................................ 52
2.5.3 Add-in Board Considerations .................................................. 52
2.6 Thermal Considerations .................................................................... 52
2.7 Reliability ....................................................................................... 54
2.8 Environmental ................................................................................ 55
3 Overview of BIOS Features
3.1 Introduction ................................................................................... 57
3.2 BIOS Flash Memory Organization ....................................................... 58
3.3 Resource Configuration .................................................................... 58
3.3.1 PCI Autoconfiguration ........................................................... 58
3.4 System Management BIOS (SMBIOS)................................................. 59
3.5 Legacy USB Support ........................................................................ 59
3.6 BIOS Updates ................................................................................. 60
3.6.1 Language Support ................................................................ 60
3.6.2 Custom Splash Screen .......................................................... 61
3.7 BIOS Recovery................................................................................ 61
3.8 Boot Options................................................................................... 62
3.8.1 CD-ROM Boot ...................................................................... 62
3.8.2 Network Boot....................................................................... 62
3.8.3 Booting Without Attached Devices........................................... 62
3.8.4 Changing the Default Boot Device During POST ........................ 62
3.9 Adjusting Boot Speed....................................................................... 63
3.9.1 Peripheral Selection and Configuration..................................... 63
3.9.2 BIOS Boot Optimizations ....................................................... 63
3.10 BIOS Security Features .................................................................... 64
4 Error Messages and Beep Codes
4.1 Speaker ......................................................................................... 65
4.2 BIOS Beep Codes ............................................................................ 65
4.3 BIOS Error Messages ....................................................................... 65
4.4 Port 80h POST Codes ....................................................................... 66
5 Regulatory Compliance and Battery Disposal Information
5.1 Regulatory Compliance..................................................................... 71
5.1.1 Safety Standards.................................................................. 71
5.1.2 European Union Declaration of Conformity Statement................ 72
5.1.3 Product Ecology Statements................................................... 73
5.1.4 EMC Regulations .................................................................. 77
5.1.5 Product Certification Markings (Board Level)............................. 78
5.2 Battery Disposal Information............................................................. 79
vi
Contents
Figures
1. Major Board Components.................................................................. 11
2. Block Diagram ................................................................................ 13
3. Memory Channel Configuration and DIMM Configuration........................ 17
4. Back Panel Audio Connectors ............................................................ 23
5. LAN Connector LED Locations............................................................ 25
6. Thermal Sensors and Fan Headers ..................................................... 27
7. Location of the Standby Power Indicator LED....................................... 34
8. Detailed System Memory Address Map ............................................... 36
9. Back Panel Connectors ..................................................................... 39
10. Component-side Connectors and Headers ........................................... 40
11. Connection Diagram for Front Panel Header ........................................ 45
12. Connection Diagram for Front Panel USB Headers ................................ 47
13. Location of the Jumper Block............................................................. 48
14. Board Dimensions ........................................................................... 50
15. Localized High Temperature Zones..................................................... 53
Tables
1. Feature Summary.............................................................................. 9
2. Board Components Shown in Figure 1 ................................................ 12
3. Supported Memory Configurations ..................................................... 15
4. Audio Jack Support.......................................................................... 22
5. LAN Connector LED States................................................................ 25
6. Effects of Pressing the Power Switch .................................................. 28
7. Power States and Targeted System Power........................................... 29
8. Wake-up Devices and Events ............................................................ 30
9. System Memory Map ....................................................................... 37
10. Component-side Connectors and Headers Shown in Figure 10................ 41
11. Serial ATA Connectors...................................................................... 42
12. Chassis Intrusion Header.................................................................. 42
13. Serial Port Header ........................................................................... 42
14. Front Chassis Fan Header ................................................................. 42
15. Processor Fan Header ...................................................................... 42
16. Front Panel Audio Header for Intel® HD Audio...................................... 43
17. Front Panel Audio Header for AC ’97 Audio .......................................... 43
18. Auxiliary Front Panel Power/Sleep LED Header..................................... 43
19. Processor Core Power Connector........................................................ 44
20. Main Power Connector...................................................................... 44
21. Front Panel Header .......................................................................... 45
22. States for a One-Color Power LED...................................................... 46
23. States for a Two-Color Power LED...................................................... 46
24. Auxiliary Front Panel Power LED Header.............................................. 46
25. BIOS Setup Configuration Jumper Settings.......................................... 49
26. Recommended Power Supply Current Values ....................................... 51
27. Fan Header Current Capability........................................................... 52
28. Thermal Considerations for Components ............................................. 54
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Intel Desktop Board DG41MJ Technical Product Specification
29. Intel Desktop Board DG41MJ Environmental Specifications .................... 55
30. BIOS Setup Program Menu Bar.......................................................... 58
31. BIOS Setup Program Function Keys.................................................... 58
32. Acceptable Drives/Media Types for BIOS Recovery ............................... 61
33. Boot Device Menu Options ................................................................ 62
34. Supervisor and User Password Functions............................................. 64
35. Beep Codes .................................................................................... 65
36. BIOS Error Messages ....................................................................... 65
37. Port 80h POST Code Ranges.............................................................. 66
38. Port 80h POST Codes ....................................................................... 67
39. Typical Port 80h POST Sequence........................................................ 70
40. Safety Standards............................................................................. 71
41. Lead-Free Board Markings ................................................................ 76
42. EMC Regulations ............................................................................. 77
43. Product Certification Markings ........................................................... 78
viii
1 Product Description
1.1 Overview
1.1.1 Feature Summary
Table 1 summarizes the major features of Intel® Desktop Board DG41MJ.
Table 1. Feature Summary
Form Factor Mini-ITX (6.7 inches by 6.7 inches [170.18 millimeters by 170.18 millimeters])
Processor Support for the following:
Memory
Chipset
Video Intel® Graphics Media Accelerator X4500 (Intel
Audio 5.1+2-channel audio subsystem using the Realtek* ALC888VC audio codec
Legacy I/O
Control
Peripheral
Interfaces
LAN Support 10/100/1000 Mbits/sec LAN subsystem using a Realtek RTL8111D Gigabit Ethernet
BIOS
Instantly
Available PC
Technology
®
• Intel
• Intel
• Intel
• Intel
• Intel
• Two 240-pin DDR2 SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for DDR2 667 MHz or DDR2 800 MHz DIMMs
• Support for up to 8 GB of system memory
Intel
• Intel
• Intel
subsystem
Winbond W83627DHG-P based Legacy I/O controller for hardware management,
serial, parallel, and PS/2* ports
• Eight USB 2.0 ports: four back panel connectors and two front panel headers for
• Three Serial ATA (SATA) interfaces
• PS/2 keyboard port on back panel
• One serial port header (may require specialized chassis or cable for use)
• Parallel port on back panel
Controller
• Intel BIOS (resident in the SPI Flash device)
• Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
• Support for PCI* Local Bus Specification Revision 2.3
• Suspend to RAM support
• Wake on PCI, LAN, serial port, front panel, PS/2 device, and USB ports
Celeron® processor 400 Sequence in an LGA775 socket
®
Xeon® processor 3000 Sequence in an LGA775 socket
®
Core™2 Duo processor in an LGA775 socket
®
Pentium® Dual-Core processor in an LGA775 socket
®
Celeron® Dual-Core processor in an LGA775 socket
®
G41 Express Chipset, consisting of:
®
82G41 Graphics and Memory Controller Hub (GMCH)
®
82801GB I/O Controller Hub (ICH7)
®
GMA X4500) onboard graphics
support of four ports
and SMBIOS
continued
9
Intel Desktop Board DG41MJ Technical Product Specification
Table 1. Feature Summary (continued)
Expansion
Capabilities
Hardware Monitor
Subsystem
• One PCI Conventional bus connector
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• Two fan headers
• Two fan sense inputs used to monitor fan activity
10
1.1.2 Board Layout
Figure 1 shows the location of the major components.
Product Description
Figure 1. Major Board Components
Table 2 lists the components identified in Figure 1.
11
Intel Desktop Board DG41MJ Technical Product Specification
Table 2. Board Components Shown in Figure 1
Item/callout
from Figure 1 Descri
A Front panel audio header
B Back panel connectors
C Processor core power connector (2 X 2)
D Front panel USB header
E Front panel USB header
F BIOS Setup configuration jumper block
G Auxiliary front panel power LED header
H LGA775 processor socket
I Front chassis fan header
J Processor fan header
K Serial port header
L Main Power connector (2 X 12)
M Battery
N Speaker
O DIMM Channel B socket
P DIMM Channel A socket
Q Intel 82G41 GMCH
R Intel 82801GB I/O Controller Hub (ICH7)
S Front panel header
T Serial ATA connectors (3)
U PCI Conventional bus add-in card connector
V Chassis intrusion header
ption
12
1.1.3 Block Diagram
Figure 2 is a block diagram of the major functional areas.
Product Description
13
Figure 2. Block Diagram
Intel Desktop Board DG41MJ Technical Product Specification
1.2 Legacy Considerations
This board differs from other Intel® Desktop Board products, with specific changes
including (but not limited to) the following:
• No serial port on the back panel
• No diskette drive connector
• No PS/2 mouse port on the back panel
1.3 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board DG41MJ http://www.intel.com/products/motherboard/DG41MJ/index.htm
Desktop Board Support http://support.intel.com/support/motherboards/desktop
Available configurations for the Intel
Desktop Board DG41MJ
Supported processors http://processormatch.intel.com
Chipset information http://www.intel.com/products/desktop/chipsets/index.htm
BIOS and driver updates http://downloadcenter.intel.com
Tested memory http://support.intel.com/support/motherboards/desktop/sb/CS-
Integration information http://www.intel.com/support/go/buildit
http://www.intel.com/products/motherboard/DG41MJ/index.htm
025414.htm
1.4 Processor
The board is designed to support the following processors:
®
• Intel
• Intel
• Intel
• Intel
• Intel
Other processors may be supported in the future. This board is designed to support
processors with a maximum wattage of 65 W. The processors listed above are only
supported when falling within the wattage requirements of the board. See the Intel
web site listed below for the most up-to-date list of supported processors.
For information about… Refer to:
Supported processors http://processormatch.intel.com
CAUTION
Use only the processors listed on the web site above. Use of unsupported processors
can damage the board, the processor, and the power supply.
INTEGRATOR’S NOTE
#
Use only ATX12V-compliant power supplies.
Celeron® processor in an LGA775 socket
®
Xeon® processor in an LGA775 socket
®
Core™2 Duo processor in an LGA775 socket
®
Pentium® Dual-Core processor in an LGA775 socket
®
Celeron® Dual-Core processor in an LGA775 socket
14
Product Description
For information about
Power supply connectors Section 2.2.2.4, page 44
Refer to
1.5 System Memory
The board has two DIMM sockets and supports the following memory features:
• 1.8 V DDR2 SDRAM DIMMs with gold plated contacts, with the option to raise the
voltage to support higher performance DDR2 SDRAM DIMMs
• Dual channel interleaved mode support
• Unbuffered, single-sided or double-sided DIMMs with the following restriction:
Double-sided DIMMs with x16 organization are not supported.
• 8 GB maximum total system memory. Refer to Section 2.1.1 on page 35 for
i
nformation on the total amount of addressable memory.
• Minimum total system memory: 512 MB
• Non-ECC DIMMs
• Serial Presence Detect
• DDR2 667 MHz or DDR2 800 MHz SDRAM DIMMs
⎯ DDR2 667 MHz DIMMs with SPD timings of only 5-5-5 (tCL-tRCD-tRP)
⎯ DDR2 800 MHz DIMMs with SPD timings of only 5-5-5 or 6-6-6 (tCL-tRCD-tRP)
NOTE
To be fully compliant with all applicable DDR SDRAM memory specifications, the board
should be populated with DIMMs that support the Serial Presence Detect (SPD) data
structure. This enables the BIOS to read the SPD data and program the chipset to
accurately configure memory settings for optimum performance. If non-SPD memory
is installed, the BIOS will attempt to correctly configure the memory settings, but
performance and reliability may be impacted or the DIMMs may not function under the
determined frequency.
Table 3 lists the supported DIMM configurations.
Table 3. Supported Memory Configurations
DIMM
Type
DDR2 667 512 Mbit 256 MB 4 GB 8 GB
DDR2 800 512 Mbit 256 MB 4 GB 8 GB
For information about… Refer to:
Tested Memory http://support.intel.com/support/motherboards/desktop/sb/
SDRAM
Technology
Smallest usable
DIMM (one x16
Single-sided
DIMM)
CS-025414.htm
Largest usable
DIMM (one x8
Double-sided
DIMM)
Maximum capacity
with two identical
x8 Double-sided
DIMMs
15
Intel Desktop Board DG41MJ Technical Product Specification
1.5.1 Memory Configurations
The Intel 82G41 GMCH supports the following types of memory organization:
• Dual channel (Interleaved) mode. This mode offers the highest throughput for
real world applications. Dual channel mode is enabled when the installed memory
capacities of both DIMM channels are equal. Technology and device width can vary
from one channel to the other but the installed memory capacity for each channel
must be equal. If different speed DIMMs are used between channels, the slowest
memory timing will be used.
• Single channel (Asymmetric) mode. This mode is equivalent to single channel
bandwidth operation for real world applications. This mode is used when only a
single DIMM is installed or the memory capacities are unequal. Technology and
device width can vary from one channel to the other. If different speed DIMMs are
used between channels, the slowest memory timing will be used.
• Flex mode. This mode provides the most flexible performance characteristics.
The bottommost DRAM memory (the memory that is lowest within the system
memory map) is mapped to dual channel operation; the topmost DRAM memory
(the memory that is nearest to the 8 GB address space limit), if any, is mapped to
single channel operation. Flex mode results in multiple zones of dual and single
channel operation across the whole of DRAM memory. To use flex mode, it is
necessary to populate both channels.
For information about… Refer to:
Memory Configuration Examples http://www.intel.com/support/motherboards/desktop/sb/cs-
011965.htm
16
Figure 3 illustrates the memory channel and DIMM configuration.
Product Description
Figure 3. Memory Channel Configuration and DIMM Configuration
INTEGRATOR’S NOTE
#
Regardless of the memory configuration used (dual channel, single channel, or flex
mode), DIMM 0 of Channel A must always be populated
17
Intel Desktop Board DG41MJ Technical Product Specification
1.6 Intel
The Intel G41 Express chipset consists of the following devices:
• Intel 82G41 Graphics and Memory Controller Hub (GMCH) with Direct Media
Interface (DMI) interconnect
• Intel 82801GB I/O Controller Hub (ICH7) with DMI interconnect
The GMCH component provides interfaces to the processor, memory, PCI, and the DMI
interconnect. The component also provides integrated graphics capabilities supporting
3D, 2D, and display capabilities. The ICH7 is a centralized controller for the board’s
I/O paths.
The chipset supports the following features:
• Onboard graphics
• Dynamic Video Memory Technology
• USB
• Serial ATA
For information about Refer to
The Intel G41 Express chipset http://www.intel.com/products/desktop/chipsets/index.htm
Resources used by the chipset Chapter 2
®
G41 Express Chipset
1.6.1 Intel G41 Graphics Subsystem
The Intel G41 Express chipset contains two separate, mutually exclusive graphics
options. Either the Intel Graphics Media Accelerator X4500 (Intel GMA X4500)
graphics controller (contained within the 82G41 GMCH) is used, or a PCI graphics card
can be used. When a PCI graphics card is installed, the Intel GMA X4500 graphics
controller is disabled.
1.6.1.1 Intel
®
Graphics Media Accelerator X4500 Graphics
Controller
The Intel GMA X4500 graphics controller features the following:
• High quality texture engine
⎯ DirectX10* and OpenGL* 2.0 compliant
⎯ Shader Model 4.0
• 3D Graphics Rendering enhancements
⎯ 1.6 dual texture GigaPixel/sec maximum fill rate
⎯ 16-bit and 32-bit color
⎯ Vertex cache
• Video
⎯ High Definition content at up to 1080p resolution
⎯ Dynamic Video Memory Technology (DVMT) 5.0 uses system memory based on
the operating system and the amount of memory installed
18
Product Description
• Display
⎯ Supports digital and analog displays up to 2048 x 1536 at 75 Hz refresh
(QXGA); also supports 1920 x 1080 resolution for full High Definition video
playback quality
⎯ Dual independent display support
1.6.1.2 Dynamic Video Memory Technology (DVMT 5.0)
DVMT enables enhanced graphics and memory performance through highly efficient
memory utilization. DVMT ensures the most efficient use of available system memory
for maximum 2-D/3-D graphics performance. The amount of system memory
allocated to DVMT varies depending on the amount of total system memory installed
as well as the operating system being used. For Microsoft Windows Vista*, a
minimum of 128 MB can be allocated to DVMT and a maximum of over 2 GB can be
allocated to DVMT with the correct amount of memory installed. DVMT returns system
memory back to the operating system when the additional system memory is no
longer required by the graphics subsystem.
DVMT will always use a minimal fixed portion of system physical memory (as set in the
BIOS Setup program) for compatibility with legacy applications. An example of this
would be when using VGA graphics under DOS. Once loaded, the operating system
and graphics drivers allocate additional system memory to the graphics buffer as
needed for performing graphics functions.
NOTE
The use of DVMT requires operating system driver support.
1.6.1.3 Configuration Modes
The video modes supported by this board are based on the Extended Display
Identification Data (EDID) modes of the monitor to which the system is connected.
Standard monitors are assumed.
1.6.1.4 Digital Visual Interface (DVI)
The DVI-D port supports digital DVI displays. The maximum supported resolution is
2048 x 1536 at 75 Hz refresh (QXGA). The DVI port is compliant with the DVI 1.0
specification.
19
Intel Desktop Board DG41MJ Technical Product Specification
1.6.2 USB
The board supports up to eight USB 2.0 ports, supports UHCI and EHCI, and uses
UHCI- and EHCI-compatible drivers.
The ICH7 provides the USB controller for all ports. The port arrangement is as
follows:
• Four ports are implemented with stacked back panel connectors
• Four ports are routed to two separate front panel USB headers
For information about Refer to
The location of the USB connectors on the back panel Figure 9, page 39
The location of the front panel USB headers Figure 10, page 40
1.6.3 Serial ATA Interfaces
The board provides three Serial ATA (SATA) connectors, which support one device per
connector.
1.6.3.1 Serial ATA Support
The board’s Serial ATA controller offers three independent Serial ATA ports with a
theoretical maximum transfer rate of 3 Gbits/sec per port. One device can be installed
on each port for a maximum of three Serial ATA devices. A point-to-point interface is
used for host to device connections, unlike Parallel ATA IDE which supports a
master/slave configuration and two devices per channel.
For compatibility, the underlying Serial ATA functionality is transparent to the
operating system. The Serial ATA controller can operate in both legacy and native
modes. In legacy mode, standard IDE I/O and IRQ resources are assigned (IRQ 14
and 15). In Native mode, standard PCI Conventional bus resource steering is used.
Native mode is the preferred mode for configurations using the Windows* XP
operating system.
NOTE
Many Serial ATA drives use new low-voltage power connectors and require adapters or
power supplies equipped with low-voltage power connectors.
For more information, see: http://www.serialata.org/
For information about Refer to
The location of the Serial ATA connectors Figure 10, page 40
20
Product Description
1.7 Real-Time Clock Subsystem
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years. When the computer is plugged in, the standby current from the power
supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at
25 ºC with 3.3 VSB applied.
NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be loaded
into CMOS RAM at power-on.
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate. Replace the
battery with an equivalent one. Figure 1 on page 11 shows the location of the battery.
1.8 Legacy I/O Controller
The I/O controller provides the following features:
• One serial port header
• One parallel port
• Serial IRQ interface compatible with serialized IRQ support for PCI systems
• PS/2-style keyboard interface
• Intelligent power management, including a programmable wake-up event interface
• PCI power management support
The BIOS Setup program provides configuration options for the I/O controller.
1.8.1 Serial Port Interface
The serial port header is located on the component side of the board. The serial port
supports data transfers at speeds up to 115.2 kbits/sec with BIOS support.
For information about Refer to
The location of the serial port header Figure 10, page 40
The serial port header signal mapping Table 13, page 42
21
Intel Desktop Board DG41MJ Technical Product Specification
1.8.2 PS/2 Keyboard Interface
The PS/2 keyboard connector is located on the back panel.
NOTE
Power to the computer should be turned off before a keyboard is connected or
disconnected.
For information about Refer to
The location of the keyboard connector Figure 9, page 39
1.9 Audio Subsystem
The onboard audio subsystem consists of the following:
• Intel 82801GB (ICH7)
• Realtek ALC888VC audio codec
• Back panel audio connectors
• Component-side audio headers/connectors:
⎯ Intel
The audio subsystem supports the following features:
• A signal-to-noise (S/N) ratio of 95 dB
• Independent 5.1 audio playback from back panel connectors and stereo playback
from the Intel High Definition Audio front panel header
®
High Definition Audio front panel header
NOTE
Systems built with an AC ‘97 front panel will not be able to obtain the Microsoft
Windows Vista logo.
Table 4 lists the supported functions of the front panel and back panel audio jacks.
Table 4. Audio Jack Support
Audio Jack
Front panel – Green No No No No Yes
Front panel – Pink No No No Yes No
Back panel – Blue Yes Yes No No No
Back panel – Green No No No No Yes
Back panel – Pink No No Yes Yes No
Supports
Line in?
Supports
Rear
Surround?
Supports
Center/
LFE?
Supports
Micro-
phone?
Supports
Line/Head
-phones
out?
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Product Description
1.9.1 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 Section 1.3, page 14
1.9.2 Audio Connectors and Headers
The board contains audio connectors on the back panel and audio headers on the
component side of the board. The front panel audio header provides mic in and line
out signals for the front panel. Microphone bias is supported for both the front and
back panel microphone connectors.
The front/back panel audio connectors are configurable through the audio device
drivers. The available configurable back panel audio ports are shown in Figure 4.
Item Description
A Line in
B Line out
C Mic in
Figure 4. Back Panel Audio Connectors
NOTE
The back panel audio line out connector is designed to power headphones or amplified
speakers only. Poor audio quality occurs if passive (non-amplified) speakers are
connected to this output.
For information about Refer to
The location of the front panel audio header Figure 10, page 40
The signal names of the front panel audio header Table 16, page 43
The back panel audio connectors Section 2.2.1, page 39
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Intel Desktop Board DG41MJ Technical Product Specification
1.10 LAN Subsystem
The LAN subsystem consists of the following:
• Intel 82801GB ICH7
• Realtek RTL8111D-GR Gigabit Ethernet controller for 10/100/1000 Mbits/sec
Ethernet LAN connectivity
• RJ-45 LAN connector with integrated status LEDs
Additional features of the LAN subsystem include:
• CSMA/CD protocol engine
• LAN connect interface between ICH7 and the LAN controller
• PCI Conventional bus power management
⎯ ACPI technology support
⎯ LAN wake capabilities
• LAN subsystem software
For information about Refer to
LAN software and drivers http://downloadcenter.intel.com
1.10.1 LAN Subsystem Software
LAN software and drivers are available from Intel’s World Wide Web site.
For information about Refer to
Obtaining LAN software and drivers Section 1.2, page 14
24
Product Description
1.10.2 RJ-45 LAN Connector with Integrated LEDs
Two LEDs are built into the RJ-45 LAN connector (shown in Figure 5 below).
Item Description
A Link LED (Green)
B Data Rate LED (Green/Yellow)
Figure 5. LAN Connector LED Locations
Table 5 describes the LED states when the board is powered up and the LAN
subsystem is operating.
Table 5. LAN Connector LED States
LED LED Color LED State Condition
Off LAN link is not established.
Link Green
Data Rate Green/Yellow
On LAN link is established.
Blinking LAN activity is occurring.
Off 10 Mbits/sec data rate is selected.
Green 100 Mbits/sec data rate is selected.
Yellow 1000 Mbits/sec data rate is selected.
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