Intel Power Management Features of the D945GCLF2 and ACPI Integration
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Product Description

1.13 Power Management

Power management is implemented at several levels, including:

•Software support through Advanced Configuration and Power Interface (ACPI)

•Hardware support:

⎯Power connector

⎯Fan headers

⎯LAN wake capabilities

⎯Instantly Available PC technology

⎯Wake from USB

⎯Wake from PS/2 devices

⎯Power Management Event signal (PME#) wake-up support

1.13.1ACPI

ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with the board requires an operating system that provides full ACPI support. ACPI features include:

•Plug and Play (including bus and device enumeration)

•Power management control of individual devices, add-in boards (some add-in boards may require an ACPI-aware driver), video displays, and hard disk drives

•Methods for achieving less than 15-watt system operation in the power-on/standby sleeping state

•A Soft-off feature that enables the operating system to power-off the computer

•Support for multiple wake-up events (see Table 8 on page 31)

•Support for a front panel power and sleep mode switch

Table 6 lists the system states based on how long the power switch is pressed, depending on how ACPI is configured with an ACPI-aware operating system.

Table 6. Effects of Pressing the Power Switch

If the system is in this

…and the power switch

 

state…

is pressed for

…the system enters this state

 

 

 

Off

Less than four seconds

Power-on

(ACPI G2/G5 – Soft off)

 

(ACPI G0 – working state)

 

 

 

On

Less than four seconds

Soft-off/Standby

(ACPI G0 – working state)

 

(ACPI G1 – sleeping state)

 

 

 

On

More than four seconds

Fail safe power-off

(ACPI G0 – working state)

 

(ACPI G2/G5 – Soft off)

 

 

 

Sleep

Less than four seconds

Wake-up

(ACPI G1 – sleeping state)

 

(ACPI G0 – working state)

 

 

 

Sleep

More than four seconds

Power-off

(ACPI G1 – sleeping state)

 

(ACPI G2/G5 – Soft off)

 

 

 

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Contents D945GCLF2 Revision Revision History Date Revision HistoryWhat This Document Contains Intended AudienceTypographical Conventions Chapter DescriptionOther Common Notation Contents Error Messages and Beep Codes Tables ContentsViii Overview Feature SummaryFeature Summary Instantly Available Product Description Board LayoutItem/callout From Figure Description Board Components Shown in FigureBlock Diagram Block DiagramOnline Support Legacy ConsiderationsProcessor To find information about… Visit this World Wide Web siteFor information about… Refer to Supported Memory ConfigurationsSystem Memory Intel GMA950 Graphics Controller Intel 945GC ChipsetIntel 945GC Graphics Subsystem Dynamic Video Memory Technology Dvmt Configuration Modes2 USB Page Real-Time Clock Subsystem Legacy I/O Controller Video OutputSerial Port Parallel PortKeyboard and Mouse Interface Audio Jack Retasking Support Audio SubsystemItem Description Audio Connectors and HeadersAudio Subsystem Software LAN Subsystem Software LAN SubsystemLAN Connector LED States 11.2 RJ-45 LAN Connector with Integrated LEDsHardware Monitoring Hardware Management SubsystemThermal Sensors and Fan Headers Thermal MonitoringAcpi Power ManagementEffects of Pressing the Power Switch Power States and Targeted System Power System States and Power StatesWake-up Devices and Events Wake-up Devices and EventsHardware Support Power ConnectorLAN Wake Capabilities Fan HeadersInstantly Available PC Technology 13.2.8 +5 V Standby Power Indicator LED 13.2.7 PME# Signal Wake-up SupportWake from USB Wake from PS/2 DevicesEnergy Star Addressable Memory Memory MapDetailed System Memory Address Map Address Range Decimal Hex Size Description System Memory MapTechnical Reference Connectors and Headers Back Panel Connectors Back Panel ConnectorsComponent-side Connectors and Headers Component-side Connectors and HeadersComponent-side Connectors and Headers Shown in Figure Signal Tables for the Connectors and Headers Main Power Connector Add-in Card ConnectorsPower Supply Connectors ATX12V Power Connector Front Panel Header Front Panel HeaderPower/Sleep LED Header Reset Switch HeaderStates for a One-Color Power LED States for a Two-Color Power LEDFront Panel USB Headers Connection Diagram for Front Panel USB HeadersJumper Block Function/Mode Jumper Setting ConfigurationForm Factor Mechanical ConsiderationsRecommended Power Supply Current Values Power Supply ConsiderationsElectrical Considerations Fan Header Current CapabilityAdd-in Board Considerations Thermal ConsiderationsThermal Considerations for Components Component Maximum Case TemperatureParameter Specification Intel Desktop Board D945GCLF2 Environmental SpecificationsReliability EnvironmentalPage Introduction Overview of Bios FeaturesResource Configuration Bios Flash Memory Organization1 PCI* Autoconfiguration Bios Setup Program Menu BarOverview of Bios Features System Management Bios SmbiosLegacy USB Support Custom Splash Screen Bios UpdatesLanguage Support Media Type Can be used for Bios recovery? Bios RecoveryAcceptable Drives/Media Types for Bios Recovery CD-ROM Boot Boot OptionsNetwork Boot Booting Without Attached DevicesBios Boot Optimizations Adjusting Boot SpeedPeripheral Selection and Configuration Supervisor and User Password Functions Bios Security FeaturesPage Type Pattern Bios Front-panel Power LED CodesFront-panel Power LED Blink Codes Bios Error Messages Bios Beep CodesBios Error Messages Beep CodesPort 80h Post Codes Error Messages and Beep CodesPort 80h Post Code Ranges Range Category/SubsystemPort 80h Post Codes Mouse PS/2 or USB Post Code Description of Post OperationFixed Media Removable MediaDXE Drivers Post Code Description Typical Port 80h Post SequencePage Safety Standards Safety StandardsRegulatory Compliance Standard TitleEuropean Union Declaration of Conformity Statement Product Ecology Statements Regulatory Compliance and Battery Disposal InformationDisposal Considerations Recycling ConsiderationsEspañol Russian Lead Free Intel Desktop BoardDescription Mark Lead-Free Board MarkingsRegulation Title EMC RegulationsEMC Regulations Product Certification Markings Product Certification Markings Board LevelPrecaution Battery Disposal InformationPrecaución Awas

D945GCLF2 specifications

The Intel D945GCLF2 is a compact and efficient motherboard designed for the Intel Atom processor family, particularly suited for low-power, cost-sensitive systems. This mini-ITX form factor board was released as a part of Intel's D945 series, targeting small form factor PCs, embedded systems, and home theater PC (HTPC) builds.

One of the standout features of the D945GCLF2 is its support for the Intel Atom N270 processor, a dual-core CPU that operates at a low thermal design power (TDP) of just 4 watts. This makes the board ideal for users looking to build energy-efficient systems without compromising on performance. The motherboard supports up to 2GB of DDR2 RAM, utilizing a single-channel memory architecture, which, while modest by today’s standards, suffices for basic computing tasks such as browsing, document editing, and media playback.

In terms of connectivity, the D945GCLF2 integrates a variety of I/O ports that enhance usability. It features four USB 2.0 ports, one PCI slot, and an IDE connector, catering to older peripherals while also allowing for the installation of additional components like graphics cards and network adapters. The onboard Intel Graphics Media Accelerator 950 provides adequate graphics performance for everyday activities and even supports HD video playback, making it a solid choice for multimedia applications.

Incorporating Intel's Advanced Configuration and Power Interface (ACPI) technology, the D945GCLF2 allows for efficient power management, giving users the flexibility to optimize their system's energy consumption. The board also includes essential connectivity options such as Ethernet through a 10/100 LAN port, facilitating wired networking capabilities.

Furthermore, the D945GCLF2 is equipped with multiple storage options; it provides support for Serial ATA (SATA) devices, allowing for faster data transfer rates compared to traditional PATA drives. The BIOS is user-friendly and offers a range of settings for users looking to tweak their system's performance.

Overall, the Intel D945GCLF2 motherboard is a robust solution for anyone looking to build a low-cost, low-power computing system. Its combination of small form factor, energy efficiency, and decent performance makes it suitable for a variety of applications, from basic user tasks to serving as the core of a compact home theater setup. Despite its age, the D945GCLF2 remains relevant for specific, budget-friendly builds, showcasing Intel's legacy in innovative motherboard design.
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