April 2009
Order Number: E62862-001US
The Intel
®
Desktop Board D945GSEJT 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 D945GSEJT Specification Update.
Intel® Desktop Board
D945GSEJT
Technical Product Specification
Revision History
Revision Revision History Date
-001 First release of the Intel
®
Desktop Board D945GSEJT Technical Product
Specification.
April 2009
This product specification applies to only the standard Intel
®
Desktop Board D945GSEJT with
BIOS identifier JT94510H.86A.
Changes to this specification will be published in the Intel Desktop Board D945GSEJT
Specification Update before being incorporated into a revision of this document.
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL
®
PRODUCTS. NO LICENSE,
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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
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Copies of documents which have an ordering number and are referenced in this document, or other Intel
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Copyright © 2009, Intel Corporation. All rights reserved.
iii
Preface
This Technical Product Specification (TPS) specifies the board layout, components,
connectors, power and environmental requirements, and the BIOS for the Intel
®
Desktop Board D945GSEJT. 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 D945GSEJT 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.
Intel Desktop Board D945GSEJT Technical Product Specification
iv
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.
v
Contents
1 Product Description
1.1 Overview.......................................................................................... 9
1.1.1 Feature Summary .................................................................. 9
1.1.2 Board Layout ....................................................................... 11
1.1.3 Block Diagram ..................................................................... 13
1.2 Online Support................................................................................ 14
1.3 Processor ....................................................................................... 14
1.4 System Memory .............................................................................. 15
1.5 Mobile Intel
®
945GSE Chipset ........................................................... 16
1.5.1 Intel 945GSE Graphics Subsystem .......................................... 16
1.5.2 USB ................................................................................... 18
1.5.3 ATA Support ........................................................................ 18
1.6 Real-Time Clock Subsystem .............................................................. 20
1.7 Legacy I/O Controller....................................................................... 20
1.7.1 Serial Ports.......................................................................... 20
1.7.2 Parallel Port......................................................................... 21
1.7.3 PS/2 Keyboard Interface ....................................................... 21
1.8 Audio Subsystem............................................................................. 21
1.8.1 Audio Subsystem Drivers....................................................... 22
1.8.2 Audio Connectors and Headers ............................................... 22
1.9 LAN Subsystem............................................................................... 23
1.9.1 LAN Subsystem Drivers......................................................... 23
1.9.2 RJ-45 LAN Connector with Integrated LEDs .............................. 24
1.10 Hardware Management Subsystem .................................................... 24
1.10.1 Hardware Monitoring............................................................. 24
1.10.2 Thermal Monitoring .............................................................. 25
1.11 Power Management ......................................................................... 26
1.11.1 ACPI................................................................................... 26
1.11.2 Hardware Support ................................................................ 29
1.11.3 ENERGY STAR*, E-Standby, and EuP Compliance...................... 32
2 Technical Reference
2.1 Memory Map................................................................................... 33
2.1.1 Addressable Memory............................................................. 33
2.2 Connectors and Headers................................................................... 36
2.2.1 Back Panel .......................................................................... 37
2.2.2 Component-side Connectors and Headers ................................ 39
2.3 BIOS Configuration Jumper Block....................................................... 49
2.4 Mechanical Considerations ................................................................ 51
2.4.1 Form Factor......................................................................... 51
Intel Desktop Board D945GSEJT Technical Product Specification
vi
2.5 Electrical Considerations................................................................... 52
2.5.1 Power Supply Considerations ................................................. 52
2.5.2 Fan Header Current Capability................................................ 52
2.5.3 Add-in Board Considerations .................................................. 52
2.6 Thermal Considerations.................................................................... 53
2.7 Power Consumption ......................................................................... 55
2.7.1 Minimum Load Configuration.................................................. 55
2.7.2 Maximum Load Configuration ................................................. 55
2.8 Reliability ....................................................................................... 56
2.9 Environmental ................................................................................ 57
3 Overview of BIOS Features
3.1 Introduction ................................................................................... 59
3.2 BIOS Flash Memory Organization....................................................... 60
3.3 Resource Configuration .................................................................... 60
3.3.1 PCI* Autoconfiguration.......................................................... 60
3.4 System Management BIOS (SMBIOS)................................................. 61
3.5 Legacy USB Support ........................................................................ 62
3.6 BIOS Updates ................................................................................. 63
3.6.1 BIOS Recovery..................................................................... 63
3.6.2 Custom Splash Screen .......................................................... 64
3.7 Boot Options................................................................................... 64
3.7.1 CD-ROM Boot ...................................................................... 64
3.7.2 Network Boot....................................................................... 64
3.7.3 Booting Without Attached Devices........................................... 65
3.7.4 Changing the Default Boot Device During POST ........................ 65
3.8 BIOS Security Features .................................................................... 66
4 Board Status and Error Messages
4.1 Front-panel Power LED Blink and Internal Speaker Beep Codes .............. 67
4.2 BIOS Error Messages ....................................................................... 67
4.3 Port 80h POST Codes ....................................................................... 68
5 Regulatory Compliance and Battery Disposal Information
5.1 Regulatory Compliance..................................................................... 73
5.1.1 Safety Standards.................................................................. 73
5.1.2 European Union Declaration of Conformity Statement................ 74
5.1.3 Product Ecology Statements................................................... 75
5.1.4 EMC Regulations .................................................................. 79
5.1.5 Product Certification Markings (Board Level)............................. 80
5.2 Battery Disposal Information............................................................. 81
Contents
vii
Figures
1-1. Major Board Components ............................................................... 11
1-2. Block Diagram .............................................................................. 13
1-3. LAN Connector LED Locations.......................................................... 24
1-4. Thermal Sensors and Fan Headers ................................................... 25
1-5. Location of the Standby Power Indicator LED..................................... 31
2-1. Detailed System Memory Address Map ............................................. 34
2-2. Back Panel Connectors ................................................................... 37
2-3. Back Panel Connectors ................................................................... 38
2-4. Component-side Connectors and Headers ......................................... 39
2-5. Connection Diagram for Front Panel Header ...................................... 46
2-6. Connection Diagram for Front Panel USB Header................................ 48
2-7. Connection Diagram for Front Panel USB Header (with Intel Z-U130
USB Solid-State Drive, or Compatible Device, Support)....................... 48
2-8. Location of the BIOS Configuration Jumper Block ............................... 49
2-9. Board Dimensions ......................................................................... 51
2-10. Localized High Temperature Zones................................................... 54
Tables
1. Feature Summary.............................................................................. 9
2. Board Components Shown in Figure 1-1 ............................................. 12
3. Supported Memory Configurations ..................................................... 15
4. Audio Jack Retasking Support ........................................................... 21
5. LAN Connector LED States ................................................................ 24
6. Effects of Pressing the Power Switch .................................................. 26
7. Power States and Targeted System Power........................................... 27
8. Wake-up Devices and Events ............................................................ 28
9. ENERGY STAR Requirements............................................................. 32
10. System Memory Map ....................................................................... 35
11. Component-side Connectors and Headers Shown in Figure 2-4............... 40
12. Serial Port Header (COM 1 and COM 2)............................................... 41
13. PS/2 Keyboard Port Header............................................................... 41
14. PATA Connector (44-Pin) .................................................................. 41
15. Chassis Fan Header ......................................................................... 42
16. Chassis Intrusion Header.................................................................. 42
17. SATA Connectors............................................................................. 42
18. SATA Power Connector..................................................................... 42
19. Parallel Port Header ......................................................................... 43
20. Front Panel Wireless Activity LED Header ............................................ 43
21. S/PDIF Header ................................................................................ 43
22. Internal Mono Speaker Header .......................................................... 44
23. Front Panel Audio Header for Intel HD Audio........................................ 44
24. Front Panel Audio Header for AC ’97 Audio .......................................... 44
25. ATX12V Power Connector ................................................................. 45
26. Front Panel Header .......................................................................... 46
Intel Desktop Board D945GSEJT Technical Product Specification
viii
27. States for a One-Color Power LED...................................................... 47
28. BIOS Configuration Jumper Settings................................................... 50
29. Fan Header Current Capability........................................................... 52
30. Thermal Considerations for Components ............................................. 55
31. Minimum Load Configuration Current and Power Results ....................... 55
32. Maximum Load Configuration Current and Power Results....................... 56
33. Intel Desktop Board D945GSEJT Environmental Specifications ............... 57
34. BIOS Setup Program Menu Bar.......................................................... 60
35. BIOS Setup Program Function Keys.................................................... 60
36. Acceptable Drives/Media Types for BIOS Recovery ............................... 63
37. Boot Device Menu Options ................................................................ 65
38. Supervisor and User Password Functions............................................. 66
39. Front-panel Power LED Blink and Internal Speaker Beep Codes .............. 67
40. BIOS Error Messages ....................................................................... 67
41. Port 80h POST Code Ranges.............................................................. 68
42. Port 80h POST Codes ....................................................................... 69
43. Typical Port 80h POST Sequence........................................................ 72
44. Safety Standards............................................................................. 73
45. Lead-Free Board Markings ................................................................ 78
46. EMC Regulations ............................................................................. 79
47. Product Certification Markings ........................................................... 80
9
1 Product Description
1.1 Overview
1.1.1 Feature Summary
Table 1 summarizes the major features of Intel Desktop Board D945GSEJT.
Table 1. Feature Summary
Form Factor 20 mm-thin mini-ITX, (6.7 inches by 6.7 inches [170 millimeters by
170 millimeters]) compatible with microATX
Processor Passively-cooled, soldered-down Single-Core Intel
®
Atom™ processor N270
Memory
• One 200-pin Double Data Rate 2 (DDR2) Small Outline Dual Inline Memory
Module (SO-DIMM) socket with gold-plated contacts
• Support for DDR2 533 MHz SO-DIMMs (DDR2 800 MHz and DDR2 667 MHz
validated to run at 533 MHz only)
• Support for up to 2 GB of system memory
Chipset
Passively cooled, mobile Intel
®
945GSE Express Chipset, consisting of:
• Intel
®
82945GSE Graphics and Memory Controller Hub (GMCH)
• Intel
®
82801GBM I/O Controller Hub (ICH7-M)
Audio Multi-streaming 2+2 channel audio subsystem with S/PDIF and internal mono
speaker support based on the Realtek* ALC662 high definition audio codec
Internal Graphics Intel
®
GMA950 onboard graphics subsystem with support for:
• Analog displays (VGA)
• Digital displays (DVI-D)
Legacy I/O Control Winbond W83627DHG-A based Legacy I/O controller for hardware management,
serial, parallel, and PS/2* ports
Peripheral
Interfaces
• Seven USB 2.0 ports:
― Three back panel ports
― Four front panel ports (via two internal headers; one header supports an
Intel
®
Z-U130 USB Solid-State Drive (or compatible device)
• Two Serial ATA (SATA) 3.0 Gb/s connectors (supporting IDE and AHCI)
• One SATA device power connector
• One Parallel ATA (PATA) 44-pin connector with ATA-100/66 support
• One parallel port header
• Two serial port headers
• One PS/2* keyboard header
LAN Support 10/100/1000 Mbits/sec LAN subsystem using a Realtek 8111DL Gigabit Ethernet
Controller
continued
Intel Desktop Board D945GSEJT Technical Product Specification
10
Table 1. Feature Summary (continued)
BIOS
• Intel
®
BIOS (resident in the SPI Flash device)
• Support for Advanced Configuration and Power Interface (ACPI), Plug and Play,
and SMBIOS
Instantly Available
PC Technology
• Support for PCI* Local Bus Specification Revision 2.3
• Suspend to RAM support
• Wake on PCI, PCI Express*, PS/2, serial, front panel, USB ports, and LAN
Expansion
Capabilities
• One PCI Conventional bus connector
• PCI Express Full-Mini Card slot
Hardware Monitor
Subsystem
• Hardware monitoring through the Windbond I/O controller
• Voltage sense to detect out of range power supply voltages
• Thermal sense to detect out of range thermal values
• One fan header
• One fan sense input used to monitor fan activity
• Fan speed control
Power
• Integrated DC-to-DC circuitry
• 12 VDC jack on back panel for external power supply
• ATX12V 2 x 2 power connector for alternate internal power supply
Intel Desktop Board D945GSEJT Technical Product Specification
12
Table 2. Board Components Shown in Figure 1-1
Item/callout
from Figure 1-1
Descri
ption
A
Back panel connectors
B
+12 V internal power connector (ATX12V)
C
SO-DIMM socket
D
Intel 82945GSE GMCH
E
Intel Atom processor
F
Serial port header (COM 2)
G
Serial port header (COM 1)
H
PS/2 keyboard port header
I
Reserved
J
PATA connector (44-pin)
K
Reserved
L
Chassis fan header
M
Chassis intrusion header
N
SATA connector 0
O
Intel 82801GBM I/O Controller Hub (ICH7-M)
P
SATA power connector
Q
SATA connector 1
R
Parallel port header
S
Battery
T
Reserved
U
Reserved
V
Front panel header
W
Front panel wireless activity LED header
X
PCI Express Mini Card connector
Y
BIOS Setup configuration jumper block
Z
PCI Conventional bus add-in card connector
AA
S/PDIF header
BB
Front panel USB header
CC
Internal mono speaker header
DD
Front panel audio header
EE
Front panel USB header (with Intel Z-U130 USB Solid-State
Drive, or compatible device, support)
Intel Desktop Board D945GSEJT Technical Product Specification
14
1.2 Online Support
To find information about… Visit this World Wide Web site:
Intel Desktop Board D945GSEJT http://www.intel.com/products/motherboard/D945GSEJT/index.htm
Desktop Board Support http://support.intel.com/support/motherboards/desktop
Available configurations for the Intel
Desktop Board D945GSEJT
http://www.intel.com/products/motherboard/D945GSEJT/index.htm
Chipset information http://www.intel.com/design/chipsets/embedded/945gse/
BIOS and driver updates http://downloadcenter.intel.com
Integration information http://www.intel.com/support/go/buildit
1.3 Processor
The board is designed to support a single-core Intel Atom processor N270 soldered
down.
NOTE
The board is designed to be passively cooled in a properly ventilated chassis. Chassis
venting locations are recommended above the processor heatsink area for maximum
heat dissipation effectiveness.
#
INTEGRATOR’S NOTE
The board may be powered by using an external 12 VDC or internal ATX12V-compliant
power supply. Use of an external 12 VDC power supply is preferred.
For information about Refer to
Power supply connectors Section 2.2.2.3, page 45
Product Description
15
1.4 System Memory
The board has one 200-pin DDR2 SO-DIMM socket and supports the following memory
features:
• DDR2 SDRAM SO-DIMMs with gold-plated contacts
• Unbuffered, single-sided or double-sided SO-DIMMs
• 2 GB maximum total system memory
• Minimum total system memory: 256 MB
• Non-ECC SO-DIMMs
• Serial Presence Detect
• DDR2 533 MHz SDRAM SO-DIMMs (DDR2 800 MHz and DDR2 667 MHz validated to
run at 533 MHz only)
NOTE
Due to passively-cooled thermal constraints, system memory must have an operating
temperature rating of 85
o
C.
The board is designed to be passively cooled in a properly ventilated chassis. Chassis
venting locations are recommended above the system memory area for maximum
heat dissipation effectiveness.
NOTE
To be fully compliant with all applicable DDR2 SDRAM memory specifications, the
board should be populated with SO-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, performance and reliability may be impacted or the
SO-DIMMs may not function under the determined frequency.
Table 3 lists the supported SO-DIMM configurations.
Table 3. Supported Memory Configurations
SO-DIMM
Capacity
Configuration
SDRAM
Density
SDRAM Organization
Front-side/Back-side
Number of SDRAM
Devices
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).
Intel Desktop Board D945GSEJT Technical Product Specification
16
1.5 Mobile Intel
®
945GSE Chipset
The Mobile Intel 945GSE chipset consists of the following devices:
• Intel 82945GSE Graphics and Memory Controller Hub (GMCH) with Direct Media
Interface (DMI) interconnect
• Intel 82801GBM I/O Controller Hub (ICH7-M) with DMI interconnect
The GMCH component provides interfaces to the CPU, memory, and the DMI
interconnect. The component also provides integrated graphics capabilities supporting
3D, 2D, and display capabilities. The ICH7-M is a centralized controller for the board’s
I/O paths.
NOTE
The board is designed to be passively cooled in a properly ventilated chassis. Chassis
venting locations are recommended above the GMCH heatsink area for maximum heat
dissipation effectiveness.
For information about Refer to
The Intel 945GSE chipset http://www.intel.com/design/chipsets/embedded/945gse/
Resources used by the chipset Chapter 2
1.5.1 Intel 945GSE Graphics Subsystem
1.5.1.1 Intel
®
GMA950 Graphics Controller
The Intel GMA950 graphics controller features the following:
• 166 MHz core frequency
• High performance 3-D setup and render engine
• High quality texture engine
⎯ DX9* Compliant Hardware Pixel Shader 2.0
⎯ Alpha and luminance maps
⎯ Texture color-keying/chroma-keying
⎯ Cubic environment reflection mapping
⎯ Enhanced texture blending functions
• 3D Graphics Rendering enhancements
⎯ 1.3 Dual Texture GigaPixel/Sec Fill Rate
⎯ 16 and 32 bit color
⎯ Maximum 3D supported resolution of 1600 x 1200 x 32 at 85 Hz
⎯ Vertex cache
⎯ Anti-aliased lines
⎯ OpenGL* version 1.4 support with vertex buffer and EXT_Shadow extensions
Product Description
17
• 2D Graphics enhancements
⎯ 8, 16, and 32 bit color
⎯ Optimized 256-bit BLT engine
⎯ Color space conversion
⎯ Anti-aliased lines
• Video
⎯ Hardware motion compensation for MPEG2
⎯ Software DVD at 30 fps full screen
• Intel
®
Zoom Utility
For information about Refer to
Obtaining graphics software and utilities Section 1.2, page 14
1.5.1.2 Video Memory Allocation
Video memory is allocated from the total available system memory for the efficient
balancing of 2-D/3-D graphics performance and overall system performance. Dynamic
allocation of system memory to video memory is as follows:
• 256 MB total RAM results in 32 MB video RAM
• 512 MB total RAM results in 64 MB video RAM
• 1 GB total RAM results in 128 MB video RAM
• 2 GB total RAM results in 224 MB video RAM
1.5.1.3 Analog Display (VGA)
The VGA port supports analog displays. The maximum supported resolution is 2048 x
1536 (QXGA) at a 75 Hz refresh rate.
1.5.1.4 Digital Visual Interface (DVI)
The DVI-D port supports digital DVI displays. The maximum supported resolution is
1600 x 1200 (UXGA). The DVI port is compliant with the DVI 1.0 specification.
Intel Desktop Board D945GSEJT Technical Product Specification
18
1.5.2 USB
The board supports up to seven USB 2.0 ports, supports UHCI and EHCI, and uses
UHCI- and EHCI-compatible drivers.
ICH7-M provides the USB controllers for all USB ports. The port arrangement is as
follows:
• Three ports are implemented through a single vertical and a dual-port horizontal
connector on the back panel
• Four ports are routed to two separate front panel USB headers
NOTE
One of the front panel USB headers supports an Intel Z-U130 USB Solid-State Drive
(or compatible device).
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 2-2, page 37
The location of the front panel USB headers Figure 2-4, page 39
1.5.3 ATA Support
The board provides three ATA interface connectors:
• One PATA connector that supports two devices
• Two SATA connectors that support one device per connector
1.5.3.1 PATA Interface
The ICH7-M’s PATA controller has one bus-mastering PATA interface that is accessible
through a 44-pin connector that is compatible with 2.5 or 3.5 inch PATA hard drives
(including 2.5 inch hard drive power support). The PATA 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 ATA bus supporting host and target throttling and
transfer rates of up to 33 MB/sec.
• ATA-66: DMA protocol on ATA 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 ATA bus allows host and target throttling. The
ICH7-M’s ATA-100 logic can achieve read transfer rates up to 100 MB/sec and write
transfer rates up to 88 MB/sec.
Product Description
19
NOTE
ATA-66 and ATA-100 are faster timings and require a specialized cable to reduce
reflections, noise, and inductive coupling.
The PATA 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.
For information about Refer to
The location of the PATA connector Figure 2-4, page 39
1.5.3.2 SATA Interfaces
The ICH7-M’s SATA controller offers two independent SATA ports with a theoretical
maximum transfer rate of 3.0 Gbits/sec on each port. One device can be installed on
each port for a maximum of two SATA devices. A point-to-point interface is used for
host to device connections, unlike PATA which supports a master/slave configuration
and two devices on each channel.
For compatibility, the underlying SATA functionality is transparent to the operating
system. The SATA controller supports IDE and AHCI configuration and can operate in
both legacy and native modes. In legacy mode, standard ATA 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 Vista* operating systems.
The board ships with a 1 x 4 power connector and a power cable for powering internal
SATA storage devices. SATA power delivery is rated as follows for any combination of
hard drives and/or optical drives:
• 5 V rail: up to 3 A
• 12 V rail: up to 1.5 A
For information about Refer to
Obtaining AHCI driver Section 1.2, page 14
The location of the SATA connectors Figure 2-4, page 39
Intel Desktop Board D945GSEJT Technical Product Specification
20
1.6 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 1-1 on page 11 shows the location of the
battery.
1.7 Legacy I/O Controller
The Legacy I/O Controller provides the following features:
• Two serial ports
• 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 keyboard interface
• 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 Legacy I/O controller.
1.7.1 Serial Ports
The serial ports, COM 1 and COM 2, are implemented as two 10-pin headers on the
board. The serial ports support data transfers at speeds up to 115.2 kbits/sec with
BIOS support.
For information about Refer to
The location of the serial port headers Figure 2-4, page 39
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