Intel BOXD915GVWBL - Desktop Board D915GVWBL, D915GVWB User Manual
Intel® Desktop Board
D915GVWB
Technical Product Specification
The Intel® Desktop Board D915GVWB 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 D915GVWB Specification Update.
October 2004
Order Number: C88968-002
Revision History
Revision Revision History Date
-001 First release of the Intel® Desktop Board D915GVWB Technical Product
Specification.
-002 Second release of the Intel® Desktop Board D915GVWB Technical
Product Specification.
September 2004
October 2004
This product specification applies to only standard Intel
®
Desktop Board D915GVWB with BIOS
identifier WB91X10J.86A.
Changes to this specification will be published in the Intel Desktop Board D915GVWB
Specification Update before being incorporated into a revision of this document.
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE,
EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED
BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL’S TERMS AND CONDITIONS OF SALE FOR SUCH
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provide any license, express or implied, by estoppel or otherwise, to any such patents, trademarks, copyrights, or other
intellectual property rights.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.”
Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising
from future changes to them.
®
Intel
desktop boards may contain design defects or errors known as errata, which may cause the product 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 product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be
obtained from:
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* Other names and brands may be claimed as the property of others.
Copyright © 2004, 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
It describes the standard product and available manufacturing options.
Intended Audience
The TPS is intended to provide detailed, technical information about the Desktop Board
D915GVWB 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.
What This Document Contains
Chapter Description
1 A description of the hardware used on the Desktop Board D915GVWB
2 A map of the resources of the Desktop Board
3 The features supported by the BIOS Setup program
4 A description of the BIOS error messages, beep codes, and POST codes
Desktop Board D915GVWB.
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.
WARNING
Warnings indicate conditions, which if not observed, can cause personal injury.
iii
Intel Desktop Board D915GVWB Technical Product Specification
Other Common Notation
# Used after a signal name to identify an active-low signal (such as USBP0#)
(NxnX) When used in the description of a component, N indicates component type, xn are the relative
coordinates of its location on the Desktop Board D915GVWB, and X is the instance of the
particular part at that general location. For example, J5J1 is a connector, located at 5J. It is
the first connector in the 5J area.
GB Gigabyte (1,073,741,824 bytes)
GB/sec Gigabytes per second
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 Description
1.1 PCI Bus Terminology Change........................................................................................9
1.2 Overview......................................................................................................................10
1.2.1 Feature Summary..........................................................................................10
1.2.2 Manufacturing Options ..................................................................................11
1.2.3 Board Layout.................................................................................................12
1.2.4 Block Diagram...............................................................................................14
1.3 Online Support.............................................................................................................15
1.4 Processor.....................................................................................................................15
1.5 System Memory...........................................................................................................15
1.5.1 Memory Configurations .................................................................................17
1.6 Intel® 915GV Chipset...................................................................................................21
1.6.1 Intel 915GV Graphics Subsystem .................................................................21
1.6.2 USB...............................................................................................................22
1.6.3 IDE Support...................................................................................................23
1.6.4 Real-Time Clock, CMOS SRAM, and Battery................................................24
1.7 PCI Express Connectors..............................................................................................24
1.8 I/O Controller................................................................................................................25
1.8.1 Serial Port......................................................................................................25
1.8.2 Parallel Port...................................................................................................25
1.8.3 Diskette Drive Controller................................................................................25
1.8.4 Keyboard and Mouse Interface .....................................................................26
1.9 Audio Subsystem.........................................................................................................26
1.9.1 Audio Subsystem Software ...........................................................................26
1.9.2 Audio Connectors..........................................................................................26
1.9.3 Intel® High Definition Audio Subsystem ........................................................27
1.10 LAN Subsystem (Optional)...........................................................................................28
1.10.1 Intel® 82562EZ Physical Layer Interface Device...........................................28
1.10.2 Alert Standard Format (ASF) Support...........................................................29
1.10.3 LAN Subsystem Software..............................................................................29
1.11 Hardware Management Subsystem.............................................................................29
1.11.1 Hardware Monitoring and Fan Control ASIC.................................................29
1.11.2 Thermal Monitoring........................................................................................30
1.11.3 Fan Monitoring...............................................................................................31
1.11.4 Fan Speed Control (Intel® Precision Cooling Technology)............................31
1.11.5 Chassis Intrusion and Detection....................................................................31
1.12 Power Management.....................................................................................................31
1.12.1 ACPI..............................................................................................................32
1.12.2 Hardware Support .........................................................................................34
2 Technical Reference
2.1 Introduction ..................................................................................................................39
2.2 Memory Resources......................................................................................................39
2.2.1 Addressable Memory.....................................................................................39
2.2.2 Memory Map..................................................................................................41
v
Intel Desktop Board D915GVWB Technical Product Specification
2.3 DMA Channels.............................................................................................................41
2.4 Fixed I/O Map...............................................................................................................42
2.5 PCI Configuration Space Map......................................................................................43
2.6 Interrupts......................................................................................................................44
2.7 PCI Conventional Interrupt Routing Map .....................................................................45
2.8 Connectors...................................................................................................................46
2.8.1 Back Panel Connectors.................................................................................46
2.8.2 Component-side Connectors.........................................................................48
2.9 Jumper Block ...............................................................................................................55
2.10 Mechanical Considerations..........................................................................................56
2.10.1 Form Factor...................................................................................................56
2.10.2 I/O Shield.......................................................................................................57
2.11 Electrical Considerations..............................................................................................58
2.11.1 DC Loading....................................................................................................58
2.11.2 Add-in Board Considerations.........................................................................58
2.11.3 Fan Connector Current Capability.................................................................58
2.11.4 Power Supply Considerations .......................................................................59
2.12 Thermal Considerations...............................................................................................60
2.13 Reliability......................................................................................................................62
2.14 Environmental ..............................................................................................................63
2.15 Regulatory Compliance................................................................................................64
2.15.1 Safety Regulations ........................................................................................64
2.15.2 EMC Regulations...........................................................................................64
2.15.3 European Union Declaration of Conformity Statement..................................65
2.15.4 Product Ecology Statements.........................................................................66
2.15.5 Product Certification Markings (Board Level)................................................67
3 Overview of BIOS Features
3.1 Introduction ..................................................................................................................69
3.2 BIOS Flash Memory Organization ...............................................................................70
3.3 Resource Configuration ...............................................................................................70
3.3.1 PCI Autoconfiguration....................................................................................70
3.3.2 PCI IDE Support............................................................................................70
3.4 System Management BIOS (SMBIOS) ........................................................................71
3.5 Legacy USB Support....................................................................................................71
3.6 BIOS Updates..............................................................................................................72
3.6.1 Language Support.........................................................................................72
3.6.2 Custom Splash Screen..................................................................................72
3.7 Boot Options ................................................................................................................73
3.7.1 CD-ROM Boot ...............................................................................................73
3.7.2 Network Boot.................................................................................................73
3.7.3 Booting Without Attached Devices................................................................73
3.7.4 Changing the Default Boot Device During POST..........................................73
3.8 Fast Booting Systems with Intel® Rapid BIOS Boot.....................................................74
3.8.1 Peripheral Selection and Configuration.........................................................74
3.8.2 Intel Rapid BIOS Boot ...................................................................................74
3.9 BIOS Security Features ...............................................................................................75
vi
4 Error Messages and Beep Codes
4.1 BIOS Error Messages..................................................................................................77
4.2 Port 80h POST Codes .................................................................................................79
4.3 Bus Initialization Checkpoints ......................................................................................83
4.4 Speaker ....................................................................................................................... 84
4.5 BIOS Beep Codes........................................................................................................84
Figures
1. Board Components......................................................................................................12
2. Block Diagram..............................................................................................................14
3. Memory Channel Configuration ...................................................................................17
4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs ..............................18
5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs............................18
6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs..............................19
7. Single Channel (Asymmetric) Mode Configuration with One DIMM.............................20
8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs........................20
9. Front/Back Panel Audio Connector Options for High Definition Audio Subsystem......27
10. High Definition Audio Subsystem Block Diagram ........................................................27
11. LAN Connector LED Locations....................................................................................28
12. Thermal Monitoring......................................................................................................30
13. Location of the Standby Power Indicator LED .............................................................37
14. Detailed System Memory Address Map.......................................................................40
15. Back Panel Connectors................................................................................................46
16. Component-side Connectors.......................................................................................48
17. Connection Diagram for Front Panel Connector..........................................................52
18. Connection Diagram for Front Panel USB Connectors................................................54
19. Connection Diagram for IEEE 1394a Connector .........................................................54
20. Location of the Jumper Block.......................................................................................55
21. Board Dimensions........................................................................................................56
22. I/O Shield Dimensions..................................................................................................57
23. Processor Heatsink Airflow..........................................................................................60
24. Localized High Temperature Zones.............................................................................61
Contents
Tables
1. Feature Summary ........................................................................................................10
2. Manufacturing Options.................................................................................................11
3. Board Components Shown in Figure 1........................................................................13
4. Supported System Bus Frequency and Memory Speed Combinations.......................16
5. Supported Memory Configurations ..............................................................................16
6. LAN Connector LED States .........................................................................................28
7. Effects of Pressing the Power Switch ..........................................................................32
8. Power States and Targeted System Power .................................................................33
9. Wake-up Devices and Events......................................................................................33
10. System Memory Map ...................................................................................................41
11. DMA Channels.............................................................................................................41
12. I/O Map ........................................................................................................................42
13. PCI Configuration Space Map......................................................................................43
vii
Intel Desktop Board D915GVWB Technical Product Specification
14. Interrupts......................................................................................................................44
15. PCI Interrupt Routing Map ...........................................................................................45
16. Back Panel Connectors Shown in Figure 15................................................................47
17. Component-side Connectors Shown in Figure 16 .......................................................49
18. Front Panel Audio Connector.......................................................................................49
19. Front Chassis Fan and Rear Chassis Fan Connectors................................................50
20. Processor Fan Connector............................................................................................50
21. Chassis Intrusion Connector........................................................................................50
22. Serial ATA Connectors.................................................................................................50
23. Main Power Connector.................................................................................................51
24. ATX12V Power Connector...........................................................................................51
25. Auxiliary Front Panel Power/Sleep LED Connector.....................................................52
26. Front Panel Connector.................................................................................................52
27. States for a One-Color Power LED..............................................................................53
28. States for a Two-Color Power LED..............................................................................53
29. BIOS Setup Configuration Jumper Settings.................................................................55
30. DC Loading Characteristics .........................................................................................58
31. Fan Connector Current Capability................................................................................58
32. Thermal Considerations for Components ....................................................................62
33. Environmental Specifications.......................................................................................63
34. Safety Regulations.......................................................................................................64
35. EMC Regulations.........................................................................................................64
36. Product Certification Markings.....................................................................................67
37. BIOS Setup Program Menu Bar...................................................................................70
38. BIOS Setup Program Function Keys............................................................................70
39. Boot Device Menu Options ..........................................................................................73
40. Supervisor and User Password Functions...................................................................75
41. BIOS Error Messages..................................................................................................77
42. Uncompressed INIT Code Checkpoints.......................................................................79
43. Boot Block Recovery Code Checkpoints .....................................................................79
44. Runtime Code Uncompressed in F000 Shadow RAM.................................................80
45. Bus Initialization Checkpoints ......................................................................................83
46. Upper Nibble High Byte Functions...............................................................................83
47. Lower Nibble High Byte Functions...............................................................................84
48. Beep Codes .................................................................................................................84
viii
1 Product Description
What This Chapter Contains
1.1 PCI Bus Terminology Change........................................................................................9
1.2 Overview......................................................................................................................10
1.3 Online Support.............................................................................................................15
1.4 Processor.....................................................................................................................15
1.5 System Memory...........................................................................................................15
1.6 Intel® 915GV Chipset...................................................................................................21
1.7 PCI Express Connectors..............................................................................................24
1.8 I/O Controller................................................................................................................25
1.9 Audio Subsystem.........................................................................................................26
1.10 LAN Subsystem (Optional)...........................................................................................28
1.11 Hardware Management Subsystem.............................................................................29
1.12 Power Management.....................................................................................................31
1.1 PCI Bus Terminology Change
Previous generations of Intel® Desktop Boards used an add-in card connector referred to as PCI.
This generation of Intel Desktop Boards adds a new technology for add-in cards: PCI Express*.
The 32-bit parallel bus previously referred to as PCI is now called PCI Conventional.
9
Intel Desktop Board D915GVWB Technical Product Specification
1.2 Overview
1.2.1 Feature Summary
Table 1 summarizes the major features of the Desktop Board D915GVWB.
Table 1. Feature Summary
Form Factor
Processor
Memory
Chipset
Video
Audio
I/O Control
USB
Peripheral
Interfaces
LAN Support
BIOS
Instantly Available
PC Technology
microATX Form Factor (9.60 inches by 9.60 inches [243.84 millimeters by
243.84 millimeters])
®
Support for an Intel
533 MHz system bus
• Four DDR SDRAM Dual Inline Memory Module (DIMM) sockets
• Support for DDR 400 MHz and DDR 333 MHz DIMMs
• Support for up to 4 GB of system memory
®
Intel
915GV Chipset, consisting of:
• Intel® 82915GV Graphics Memory Controller Hub (GMCH)
®
• Intel
• 4 Mbit Firmware Hub (FWH)
Intel
Intel
LPC Bus I/O controller
Support for USB 2.0 devices
• Eight USB ports
• One serial port
• One parallel port
• Four Serial ATA interfaces
• One Parallel ATA IDE interface with UDMA 33, ATA-66/100 support
• One diskette drive interface
• PS/2* keyboard and mouse ports
10/100 Mbits/sec LAN subsystem using the Intel
(PLC) device
• Intel/AMI BIOS (resident in the 4 Mbit FWH)
• Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
• Support for PCI Local Bus Specification Revision 2.2
• Support for PCI Express Revision 1.0a
• Suspend to RAM support
• Wake on PCI, RS-232, front panel, PS/2 devices, and USB ports
82801FB I/O Controller Hub (ICH6)
®
GMA900 onboard graphics subsystem
®
High Definition Audio subsystem using the Realtek ALC860 audio codec
and SMBIOS
Pentium® 4 processor in an LGA775 socket with an 800 or
®
82562EZ platform LAN Connect
continued
10
Table 1. Feature Summary (continued)
Expansion
Capabilities
Hardware Monitor
Subsystem
• Two PCI Conventional bus add-in card connectors (SMBus routed to PCI
Conventional bus connector 2)
• One PCI Express x1 bus add-in card connector
• Hardware monitoring and fan control ASIC
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• Three fan connectors
• Three fan sense inputs used to monitor fan activity
• Fan speed control
1.2.2 Manufacturing Options
Table 2 describes the manufacturing options on the Desktop Board D915GVWB. Not every
manufacturing option is available in all marketing channels. Please contact your Intel
representative to determine which manufacturing options are available to you.
Table 2. Manufacturing Options
IEEE-1394a
Interface
IEEE-1394a controller and two IEEE-1394a connectors
Product Description
For information about Refer to
Available configurations for the Desktop Board D915GVWB Section 1.3, page 15
11
Intel Desktop Board D915GVWB Technical Product Specification
1.2.3 Board Layout
Figure 1 shows the location of the major components on the Desktop Board D915GVWB.
EE
DD
CC
BB
AA
BCD
E FA
G
H
I
J
K
L
Z
M
VX
S
Figure 1. Board Components
Table 3 lists the components identified in Figure 1.
NOPQY RWTU
OM17319
12
Table 3. Board Components Shown in Figure 1
Item/Callout
from Figure 1 Description
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA
BB
CC
DD
EE
Realtek ALC860 audio codec
Front panel audio connector
PCI Conventional bus add-in card connectors
LAN PLC
Rear chassis fan connector
Back panel connectors
+12V power connector (ATX12V)
LGA775 processor socket
Hardware monitoring and fan control ASIC
Processor fan connector
Intel 82915GV GMCH
DIMM Channel A sockets
DIMM Channel B sockets
I/O controller
Power connector
Diskette drive connector
Parallel ATE IDE connector
Battery
Chassis intrusion connector
BIOS Setup configuration jumper block
4 Mbit Firmware Hub (FWH)
Front chassis fan connector
Serial ATA connectors (4)
Auxiliary front panel power LED connector
Front panel connector
Front panel USB connectors
Intel 82801FB I/O Controller Hub (ICH6)
Front panel IEEE-1394a connectors (optional)
IEEE-1394a controller (optional)
Speaker
PCI Express x1 bus add-in card connector
Product Description
13
Intel Desktop Board D915GVWB Technical Product Specification
1.2.4 Block Diagram
Figure 2 is a block diagram of the major functional areas of the board.
PCI Express x1 Slot 1
Parallel ATA
IDE Connector
LGA775
Processor Socket
VGA
Port
Channel A
DIMMs (2)
Channel B
DIMMs (2)
Display Interface
Parallel ATA
IDE Interface
System Bus
(800/533 MHz)
Intel 82915GV
Graphics and
Memory Controller
Hub (GMCH)
Dual-Channel
Memory Bus
SMBus
PCI Express
x1 Interface
USB
LPC Bus
I/O
Controller
LPC Bus
Intel 82801FB
I/O Controller Hub
(ICH6)
DMI Interconnect
Back Panel/Front Panel
USB Ports
Serial Port
Parallel Port
PS/2 Mouse
PS/2 Keyboard
Diskette Drive
Connector
4 Mbit
Firmware Hub
(FWH)
Intel 915GV Chipset
Interface
LAN Connect
10/100
LAN PLC
LAN
Connector
IEEE-1394a Connectors
(Optional)
PCI Slot 1
PCI Slot 2
= connector or socket
PCI Bus
PCI Bus
SMBus
Hardware Monitoring
and Fan Control AS IC
Figure 2. Block Diagram
Serial ATA
IDE Interface
High Definit ion Audio Link
Mic In/Retasking Jack B
Audio
Codec
Line In/Retasking Jack C
Line Out/Retasking Jack D
Retasking Jack E [Port 1]
Retasking Jack F [Port 2]
Serial ATA IDE
Connectors (4)
OM17320
14
Product Description
1.3 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board D915GVWB under
“Desktop Board Products” or “Desktop
Board Support”
Available configurations for the Desktop
Board D915GVWB
Processor data sheets http://www.intel.com/design/litcentr
ICH6 addressing http://developer.intel.com/design/chipsets/datashts
Custom splash screens http://intel.com/design/motherbd/gen_indx.htm
Audio software and utilities http://www.intel.com/design/motherbd
LAN software and drivers http://www.intel.com/design/motherbd
http://www.intel.com/design/motherbd
http://support.intel.com/support/motherboards/desktop
http://developer.intel.com/design/motherbd/wb/wb_available.htm
1.4 Processor
The board is designed to support Intel Pentium 4 processors in an LGA775 processor socket with an
800 or 533 MHz system bus. See the Intel web site listed below for the most up-to-date list of
supported processors.
For information about… Refer to:
Supported processors for the D915GVWB board http://www.intel.com/design/motherbd/wb/wb_proc.htm
CAUTION
Use only the processors listed on 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.
• Refer to Table 4 on page 16 for a list of supported system bus frequency and memory speed
combinations.
For information about Refer to
Power supply connectors Section 2.8.2.1, page 50
1.5 System Memory
The board has four DIMM sockets and support the following memory features:
• 2.5 V (only) DDR SDRAM DIMMs with gold-plated contacts
• Unbuffered, single-sided or double-sided DIMMs with the following restriction:
Double-sided DIMMS with x16 organization are not supported.
• 4 GB maximum total system memory. Refer to Section 2.2.1 on page 39 for information on the
total amount of addressable memory.
• Minimum total system memory: 128 MB
15
Intel Desktop Board D915GVWB Technical Product Specification
• Non-ECC DIMMs
• Serial Presence Detect
• DDR 400 MHz and DDR 333 MHz SDRAM DIMMs
Table 4 lists the supported system bus frequency and memory speed combinations.
Table 4. Supported System Bus Frequency and Memory Speed Combinations
To use this type of DIMM… The processor's system bus frequency must be…
DDR 400 800 MHz
DDR 333 (Note) 800 or 533 MHz
Note: When using an 800 MHz system bus frequency processor, DDR 333 memory is clocked at 320 MHz. This minimizes
system latencies to optimize system throughput.
NOTES
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 allows
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 5 lists the supported DIMM configurations.
Table 5. Supported Memory Configurations
DIMM
Capacity
128 MB SS 256 Mbit 16 M x 16/empty 4
256 MB SS 256 Mbit 32 M x 8/empty 8
256 MB SS 512 Mbit 32 M x 16/empty 4
512 MB DS 256 Mbit 32 M x 8/32 M x 8 16
512 MB SS 512 Mbit 64 M x 8/empty 8
512 MB SS 1 Gbit 64 M x 16/empty 4
1024 MB DS 512 Mbit 64 M x 8/64 M x 8 16
1024 MB SS 1 Gbit 128 M x 8/empty 8
2048 MB DS 1 Gbit 128 M x 8/128 M x 8 16
Note: In the second column, “DS” refers to double-sided memory modules (containing two rows of SDRAM) and “SS” refers
to single-sided memory modules (containing one row of SDRAM).
INTEGRATOR’S NOTE
#
Configuration
SDRAM
Density
SDRAM Organization
Front-side/Back-side
Number of SDRAM
Devices
It is possible to install four 2048 MB (2 GB) modules for a total of 8 GB of system memory,
however, only 4 GB of address space is available. Refer to Section 2.2.1, on page 39 for additional
information on available memory.
16
Product Description
1.5.1 Memory Configurations
The Intel 82915GV GMCH supports two 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.
Figure 3 illustrates the memory channel and DIMM configuration.
NOTE
The DIMM0 sockets of both channels are blue. The DIMM1 sockets of both channels are black.
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
Figure 3. Memory Channel Configuration
17
OM17321
Intel Desktop Board D915GVWB Technical Product Specification
1.5.1.1 Dual Channel (Interleaved) Mode Configurations
Figure 4 shows a dual channel configuration using two DIMMs. In this example, the DIMM0
(blue) sockets of both channels are populated with identical DIMMs.
1 GB
Channel A, DIMM 0
Channel A, DIMM 1
1 GB
Channel B, DIMM 0
Channel B, DIMM 1
OM17123
Figure 4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs
Figure 5 shows a dual channel configuration using three DIMMs. In this example, the combined
capacity of the two DIMMs in Channel A equal the capacity of the single DIMM in the DIMM0
(blue) socket of Channel B.
256 MB
256 MB
Channel A, DIMM 0
Channel A, DIMM 1
512 MB
Channel B, DIMM 0
Channel B, DIMM 1
OM17122
Figure 5. Dual Channel (Interleaved) Mode Configuration with Three DIMMs
18
Product Description
Figure 6 shows a dual channel configuration using four DIMMs. In this example, the combined
capacity of the two DIMMs in Channel A equal the combined capacity of the two DIMMs in
Channel B. Also, the DIMMs are matched between DIMM0 and DIMM1 of both channels.
256 MB
512 MB
256 MB
512 MB
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17124
Figure 6. Dual Channel (Interleaved) Mode Configuration with Four DIMMs
19
Intel Desktop Board D915GVWB Technical Product Specification
1.5.1.2 Single Channel (Asymmetric) Mode Configurations
NOTE
Dual channel (Interleaved) mode configurations provide the highest memory throughput.
Figure 7 shows a single channel configuration using one DIMM. In this example, only the DIMM0
(blue) socket of Channel A is populated. Channel B is not populated.
256 MB
Figure 7. Single Channel (Asymmetric) Mode Configuration with One DIMM
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17125
Figure 8 shows a single channel configuration using three DIMMs. In this example, the combined
capacity of the two DIMMs in Channel A does not equal the capacity of the single DIMM in the
DIMM0 (blue) socket of Channel B.
256 MB
512 MB
512 MB
Figure 8. Single Channel (Asymmetric) Mode Configuration with Three DIMMs
Channel A, DIMM 0
Channel A, DIMM 1
Channel B, DIMM 0
Channel B, DIMM 1
OM17126
20
Product Description
1.6 Intel® 915GV Chipset
The Intel 915GV chipset consists of the following devices:
• Intel 82915GV Graphics Memory Controller Hub (GMCH) with Direct Media Interface (DMI)
interconnect
• Intel 82801FB I/O Controller Hub (ICH6) with DMI interconnect
• Firmware Hub (FWH)
The GMCH is a centralized controller for the system bus, the memory bus, the PCI Express bus,
and the DMI interconnect. The ICH6 is a centralized controller for the board’s I/O paths. The
FWH provides the nonvolatile storage of the BIOS.
For information about Refer to
The Intel 915GV chipset http://developer.intel.com/
Resources used by the chipset Chapter 2
1.6.1 Intel 915GV Graphics Subsystem
The Intel GMA900 graphics controller (contained within the 82915GV GMCH) features the
following:
• Integrated graphics controller
⎯ 32 bpp (Bits Per Pixel) graphics engine
⎯ 333 MHz core frequency
⎯ 256-bit 2-D engine
⎯ 32-bit 3-D engine
⎯ Motion video acceleration
⎯ Pixel Shader 2.0
⎯ 4-pixel pipes
⎯ DirectX 9.0 Hardware Acceleration
⎯ Software Vertex Shader
• Up to 2048 x 1536 at 75 Hz refresh
• High performance 3-D setup and render engine
• High quality/performance texture engine
• Display
⎯ Integrated 24-bit 400 MHz RAMDAC
⎯ DDC2B compliant interface
• Video hardware motion compensation for software MPEG2 decode
• Dynamic Video Memory Technology (DVMT) support up to 224 MB
• Intel
For information about Refer to
DVMT Section 1.6.1.1, page 22
Obtaining graphics software and utilities Section 1.3, page 15
®
Zoom Utility
21
Intel Desktop Board D915GVWB Technical Product Specification
1.6.1.1 Dynamic Video Memory Technology (DVMT)
DVMT enables enhanced graphics and memory performance through Direct AGP, and highly
efficient memory utilization. DVMT ensures the most efficient use of available system memory for
maximum 2-D/3-D graphics performance. Up to 224 MB of system memory can be allocated to
DVMT on systems that have 512 MB or more of total system memory installed. Up to 128 MB can
be allocated to DVMT on systems that have 256 MB but less than 512 MB of total installed system
memory. Up to 64 MB can be allocated to DVMT when less than 256 MB of system memory is
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.
1.6.2 USB
The board supports up to eight USB 2.0 ports, supports UHCI and EHCI, and uses UHCI- and
EHCI-compatible drivers.
The ICH6 provides the USB controller for all ports. The port arrangement is as follows:
• Four ports are implemented with dual stacked back panel connectors adjacent to the audio
connectors
• Four ports are routed to two separate front panel USB connectors
NOTE
Computer systems that have an unshielded cable attached to a USB port may not meet FCC
Class B requirements, even if no device is attached to the cable. Use shielded cable that meets the
requirements for full-speed devices.
For information about Refer to
The location of the USB connectors on the back panel Figure 15, page 46
The location of the front panel USB connectors Figure 16, page 48
22
Product Description
1.6.3 IDE Support
The board provides five IDE interface connectors:
• One parallel ATA IDE connector that supports two devices
• Four serial ATA IDE connectors that support one device per connector
1.6.3.1 Parallel ATE IDE Interface
The ICH6’s Parallel ATA IDE controller has one bus-mastering Parallel ATA IDE interface. The
Parallel ATA IDE interface supports the following modes:
• Programmed I/O (PIO): processor controls data transfer.
• 8237-style DMA: DMA offloads the processor, supporting transfer rates of up to 16 MB/sec.
• Ultra DMA: DMA protocol on IDE bus supporting host and target throttling and transfer rates
of up to 33 MB/sec.
• ATA-66: DMA protocol on IDE bus supporting host and target throttling and transfer rates of
up to 66 MB/sec. ATA-66 protocol is similar to Ultra DMA and is device driver compatible.
• ATA-100: DMA protocol on IDE bus allows host and target throttling. The ICH6’s ATA-100
logic can achieve read transfer rates up to 100 MB/sec and write transfer rates up to 88 MB/sec.
NOTE
ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce reflections,
noise, and inductive coupling.
The Parallel ATA IDE interface also supports ATAPI devices (such as CD-ROM drives) and ATA
devices using the transfer modes.
The BIOS supports Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS)
translation modes. The drive reports the transfer rate and translation mode to the BIOS.
The board supports Laser Servo (LS-120) diskette technology through the Parallel ATA 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:
• ARMD-FDD (ATAPI removable media device – floppy disk drive)
• ARMD-HDD (ATAPI removable media device – hard disk drive)
For information about Refer to
The location of the Parallel ATA IDE connector Figure 16, page 48
1.6.3.2 Serial ATA Interfaces
The ICH6’s Serial ATA controller offers four independent Serial ATA ports with a theoretical
maximum transfer rate of 150 MB/s per port. One device can be installed on each port for a
maximum of four 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.
23
Intel Desktop Board D915GVWB Technical Product Specification
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 and Windows 2000 operating systems.
NOTE
Many Serial ATA drives use new low-voltage power connectors and require adaptors 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 IDE connectors Figure 16, page 48
1.6.4 Real-Time Clock, CMOS SRAM, and Battery
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.
1.7 PCI Express Connectors
The board provides one PCI Express X1 connector. The x1 interface supports simultaneous
transfer speeds up to 500 MBytes/sec
The PCI Express interface supports the PCI Conventional bus configuration mechanism so that the
underlying PCI Express architecture is compatible with PCI Conventional compliant operating
systems. Additional features of the PCI Express interface includes the following:
• Support for the PCI Express enhanced configuration mechanism
• Automatic discovery, link training, and initialization
• Support for Active State Power Management (ASPM)
• SMBus 2.0 support
• Wake# signal supporting wake events from ACPI S1, S3, S4, or S5
• Software compatible with the PCI Power Management Event (PME) mechanism defined in the
PCI Power Management Specification Rev. 1.1
24
Product Description
1.8 I/O Controller
The I/O controller provides the following features:
• One serial port
• One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port
(EPP) support
• Serial IRQ interface compatible with serialized IRQ support for PCI Conventional bus systems
• PS/2-style mouse and keyboard interfaces
• Interface for one 1.44 MB or 2.88 MB diskette drive
• Intelligent power management, including a programmable wake-up event interface
• PCI Conventional bus power management support
The BIOS Setup program provides configuration options for the I/O controller.
1.8.1 Serial Port
The Desktop Board provides one serial port, located on the back panel. 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 A connector Figure 15, page 46
1.8.2 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 15, page 46
1.8.3 Diskette Drive Controller
The I/O controller supports one diskette drive. Use the BIOS Setup program to configure the
diskette drive interface.
For information about Refer to
The location of the diskette drive connector Figure 16, page 48
25
Intel Desktop Board D915GVWB Technical Product Specification
1.8.4 Keyboard and Mouse Interface
PS/2 keyboard and mouse connectors are located on the back panel.
NOTE
The keyboard is supported in the bottom PS/2 connector and the mouse is supported in the top PS/2
connector. Power to the computer should be turned off before a keyboard or mouse is connected or
disconnected.
For information about Refer to
The location of the keyboard and mouse connectors Figure 15, page 46
1.9 Audio Subsystem
The board supports the Intel High Definition audio subsystem based on the Realtek ALC860 codec.
The audio subsystem supports the following features:
• Advanced jack sense (front and rear panel) that enables the audio codec to recognize the device
that is connected to an audio port. All jacks are capable of retasking according to user’s
definition, or can be automatically switched depending on the recognized device type.
• Stereo input and output for all jacks.
• A signal-to-noise (S/N) ratio of 90 dB.
INTEGRATOR’S NOTE
#
For the front panel jack sensing and automatic retasking feature to function, a front panel daughter
card that is designed for Intel High Definition Audio must be used. Otherwise, an AC ’97 style
audio front panel connector will be assumed and the Line Out and Mic In functions will be
permanent.
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 15
1.9.2 Audio Connectors
The board contains audio connectors on both the back panel and the component side of the board.
The front panel audio connector (located on the component-side of the board) is a 2 x 5-pin
connector that provides mic in and line out signals for front panel audio connectors.
For information about Refer to
The location of the front panel audio connector Figure 16, page 48
The signal names of the front panel audio connector Table 18, page 49
26
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