HP dc7800 manual USB Legacy Support, Management Engine Functions

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SYSTEM BIOS

8.6 USB Legacy Support

The system BIOS ROM checks the USB port, during POST, for the presence of a USB keyboard. This allows a system with only a USB keyboard to be used during ROM-based setup and also on a system with an OS that does not include a USB driver.

On such a system a keystroke will generate an SMI and the SMI handler will retrieve the data from the device and convert it to PS/2 data. The data will be passed to the keyboard controller and processed as in the PS/2 interface. Changing the delay and/or typematic rate of a USB keyboard though BIOS function INT 16 is not supported.

8.7 Management Engine Functions

The management engine function of Intel AMT allows a system unit to be managed remotely over a network, where or not the system is powered up or not1. The system BIOS can request the management engine to generate the following alerts:

■Temperature alert

■Fan failure alert

■Chassis intrusion alert

■Watchdog timer alert

■No memory installed alert

1.Assumes the unit is connected to an active AC outlet.

8-8

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Technical Reference Guide

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Contents Technical Reference Guide OctoberTechnical Reference Guide Contents System Support Processor/Memory SubsystemInput/Output Interfaces Power and Signal Distribution Integrated Graphics SubsystemSystem Bios Error Messages and Codes IndexAbout this Guide Additional Information SourcesModel Numbering Convention Online ViewingIntroduction Serial Number Notational ConventionsSpecial Notices ValuesCommon Acronyms and Abbreviations Acronyms and Abbreviations Acronym or DescriptionCMC CmosCPQ CPUEscd FifoFPM FPUAcronyms and Abbreviations Acronym or Abbreviation DescriptionPCA PCIPCI-E PCMSgram SimdSimm SmartVAC VDCVesa VGASystem Overview IntroductionFeatures Sodimm Dimm Feature Difference Matrix by Form Factor4GB 8GB Architectural Differences By Form Factor System ArchitectureFunction HP Comapq dc7800 Business PC Architecture, Block diagram Intel Processor Support Chipset Components and Functionality ChipsetComponents Function Support Components System MemorySupport Component Functions Component Name FunctionMass Storage Serial and Parallel InterfacesUniversal Serial Bus Interface Network Interface ControllerGraphics Subsystem Audio SubsystemIntegrated Graphics Subsystem Statistics Integrated Graphics ControllerSpecifications Environmental Specifications Factory ConfigurationPower Supply Electrical Specifications Parameter Operating Non-operatingPhysical Specifications Parameter Usdt SFF CMTDiskette Drive Specifications Parameter MeasurementOptical Drive Specifications DVD/CD-RW SuperMultiParameter CD-RW/DVD-ROM Combo LightScribe ComboHard Drive Specifications Parameter 80 GB 160 GB 250 GBSystem Overview Processor/Memory Subsystem Intel Processors Intel Processor OverviewProcessor Changing/Upgrading Supported ProcessorsClock FormMemory Subsystem Memory Upgrading Memory Mapping and Pre-allocationMemory Socket Loading Channel a Channel B Socket Socket 2 Socket 4 TotalSystem Memory Map for maximum of 8 gigabytes PCI Bus Overview PCI 2.3 Bus OperationPCI Component Configuration Access PCI Bus PCI Component Function # Device # Wired toPCI Express Bus Operation Software/Driver LayerTransaction Protocol Layer PCI Bus Mastering DevicesPCI Power Management Support Option ROM MappingPCI Interrupts Link LayerPCI 2.3 Connector PCI ConnectorsPCI 2.3 Bus Connector Pinout PCI Express Connectors PCI Express Bus Connector PinoutApic Mode System ResourcesInterrupts ModeDirect Memory Access Connector PCI slot 1 PCI slot 2 PCI slot 3PCI Interrupt Distribution System Interrupts System BoardReal-Time Clock and Configuration Memory Clearing CmosConfiguration Memory Cmos Map System ManagementStandard Cmos Locations Security FunctionsPower-On / Setup Password Setup PasswordCable Lock Provision Interface SecurityPower Management Smart Cover Lock OptionalAcpi Wake-Up Events Acpi Wake-Up Event System Wakes FromSystem Status PowerLED Beeps Action Required System StatusThermal Sensing and Cooling System Operational Status LED IndicationsRegister Map and Miscellaneous Functions System I/O MapICH9 Functions Gpio FunctionsSystem I/O Map Controller Functions Input/Output Interfaces Sata Interface Pin Sata Connector PinoutPin Description Pin Signal Pin Slim IDE Connector PinoutPata Interface Diskette Drive Interface Pin Diskette Drive Connector Pinout Pin Signal DescriptionDB-9 Serial Connector Pinout Serial InterfaceStandard Parallel Port Mode Enhanced Parallel Port ModeExtended Capabilities Port Mode Parallel InterfaceDB-25 Parallel Connector Pinout Parallel Interface ConnectorPin Signal Function Keyboard/Pointing Device Interface Keyboard Interface OperationKeyboard/Pointing Device Interface Connector Keyboard/Pointing Device Connector PinoutPointing Device Interface Operation DataUSB Connector USB Connector LocationController Signals USDT, SFF Form Factors CMT Form Factor Universal Serial Bus InterfaceUSB Connector Pinout USB Cable DataUSB Cable Length Data USB Color CodeAudio Subsystem Functional Block Diagram Audio SubsystemHD Audio Link Bus HD Audio ControllerAudio Multistreaming HD Audio Subsystem Specifications Audio SpecificationsADC/DAC Network Interface Controller LAN I/F NICWake-On-LAN Support Power Management SupportAlert Standard Format Support NIC Connector NIC SpecificationsNIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Subsystem Q35 IGC, Block diagram Functional DescriptionSdram Installed Maximum Memory Allocation IGC Standard 2D Display ModesResolution Maximum Refresh Rate Analog Digital Monitor Display ModesUpgrading Analog Monitor Connector Monitor ConnectorsDB-15 Monitor Connector Pinout Digital Monitor Connector Integrated Graphics Subsystem Power Distribution Usdt Power DistributionSFF Power Distribution Usdt 135-Watt Power Supply Unit SpecificationsSFF 240-Watt Power Supply Unit Specifications Min Range Current Max Surge Tolerance Loading RippleCMT 365-Watt Power Supply Unit Specifications CMT Power DistributionRange or Min Current Max Surge Tolerance Loading Ripple Shows the power supply cabling for CMT systems Energy Star CompliancyPower Control Power ButtonPower Button Actions Pressed Power Button ResultsPower Button Actions Power LED Condition Wake Up Events Wake-On-LANSystem Power States Power Transition OS RestartState System Condition Consumption To S0 by RequiredSignal Distribution CR1 +5 VDC LEDSystem Board Component Designations Power and Signal Distribution System Bios Upgrading ROM FlashingChangeable Splash Screen Boot Functions Boot Device OrderNetwork Boot F12 Support Memory Detection and ConfigurationBoot Error Codes Boot Error CodesVisual power LED Audible speaker Meaning Client Management Functions Function ModeClient Management Functions INT15 Temperature Status Drive Fault PredictionSystem ID and ROM Type System ID NumbersSmbios Type DataUSB Legacy Support Management Engine FunctionsIndex NumericsIndex

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