HP dc7900 manual Direct Memory Access, PCI Interrupt Distribution

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System Support

Table 4-5.

PCI Interrupt Distribution

 

 

 

 

 

System Interrupts

 

 

 

 

 

 

 

 

 

 

 

 

 

System Board

PIRQ

PIRQ

PIRQ

PIRQ

PIRQ

 

PIRQ

PIRQ

PIRQ

Connector

A

B

C

D

E

 

F

G

H

 

 

 

 

 

 

 

 

 

 

 

PCI slot 1

(J20) [1]

 

 

 

 

A

 

B

C

D

 

 

 

 

 

 

 

 

 

 

 

PCI slot 2

(J21) [1]

 

 

 

 

D

 

A

B

C

 

 

 

 

 

 

 

 

 

 

 

PCI slot 3

(J22) [2]

 

 

 

 

C

 

D

A

B

 

 

 

 

 

 

 

 

 

 

 

NOTES:

[1]SFF and CMT only

[2]CMT only

The PCI interrupts can be configured by PCI Configuration Registers 60h..63h to share the standard ISA interrupts (IRQn).

The APIC mode is supported by Windows NT, Windows 2000, and Windows XP, and Windows Vista operating systems. Systems running the Windows 95 or 98 operating system will need to run in 8259 mode.

4.3.2Direct Memory Access

Direct Memory Access (DMA) is a method by which a device accesses system memory without involving the microprocessor. Although the DMA method has been traditionally used to transfer blocks of data to or from an ISA I/O device, PCI devices may also use DMA operation as well. The DMA method reduces the amount of CPU interactions with memory, freeing the CPU for other processing tasks. For detailed information regarding DMA operation, refer to the data manual for the Intel 82801 ICH10 I/O Controller Hub.

 

4-8

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Technical Reference Guide

Image 44
Contents Technical Reference Guide SeptemberTechnical Reference Guide Contents Input/Output Interfaces Processor/Memory SubsystemSystem Support Power and Signal Distribution Integrated Graphics SubsystemSystem Bios Error Messages and Codes IndexIntroduction About this GuideAdditional Information Sources Online ViewingSerial Number Notational ConventionsSpecial Notices ValuesCommon Acronyms and Abbreviations Acronyms and Abbreviations Acronym or DescriptionCDS CGACMC CmosEisa EPPEide EscdIRQ ISALAN LCDODD PALPata PCASdvo SECSecam SgramAcronyms and Abbreviations Acronym or Abbreviation DescriptionIntroduction System Overview IntroductionFeatures 1ODD Feature Difference Matrix by Form FactorSodimm Dimm Function System ArchitectureArchitectural Differences By Form Factor HP Compaq dc7900 Business PC Architecture, Block diagram Intel Processor Support Components Function ChipsetChipset Components and Functionality Support Components System MemorySupport Component Functions Component Name FunctionMass Storage Serial InterfaceUniversal 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 CMTOptical Drive Specifications HP SuperMulti LightScribeParameter CD-RW/DVD-ROM ComboHard Drive Specifications Parameter 80 GB 160 GB 250 GBProcessor/Memory Subsystem Processor/Memory Subsystem ArchitectureIntel Processors Intel Processor OverviewProcessor Changing/Upgrading Supported Processors partial listingClock 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 2.3 Bus Operation System SupportPCI Bus Overview PCI 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 Bus Connector Pinout PCI ConnectorsPCI 2.3 Connector PCI Express Connectors PCI Express Bus Connector PinoutApic Mode System ResourcesInterrupts ModeDirect Memory Access PCI Interrupt DistributionReal-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 MapSystem I/O Map Port FunctionSIO Controller Functions Gpio FunctionsICH10 Functions Input/Output Interfaces Pin Sata Connector Pinout SATA/eSATA InterfacesSata interface Pin DescriptionOptional eSATA Bracket/Cable Assembly ESATA interfaceDiskette 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 Interface SupportPin Signal Function Parallel Interface ConnectorDB-25 Parallel Connector Pinout Keyboard/Pointing Device Interface Keyboard Interface OperationKeyboard/Pointing Device Interface Connector Keyboard/Pointing Device Connector PinoutPointing Device Interface Operation DataUSB Connector Controller Signals USB Connector Location all form factorsUniversal Serial Bus Interface ICH10 USB Port MappingUSB Connector Pinout USB Cable DataUSB Cable Length Data USB Color CodeAudio Subsystem Functional Block Diagram Audio SubsystemAudio Multistreaming HD Audio ControllerHD Audio Link Bus Audio Specifications HD Audio Subsystem SpecificationsParameter Measurement ADC/DACNetwork Interface Controller LEDAlert Standard Format Support Power Management SupportWake-On-LAN Support NIC Connector NIC SpecificationsNIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Subsystem Functional Description RGBSdram Installed Maximum Memory Allocation GMA 4500 Memory AllocationIGC Standard 2D Display Modes Resolution Maximum Refresh Rate Analog Digital MonitorDisplay Modes Upgrading DB-15 Monitor Connector Pinout Monitor ConnectorsAnalog Monitor Connector DisplayPort Connector Pin SignalIntegrated Graphics Subsystem Usdt Power Distribution Power and Signal DistributionPower Distribution 2 SFF/CMT 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 Range or Min Current Max Surge Tolerance Loading RippleShows the power supply cabling for CMT systems Energy Star CompliancyPower Control Power ButtonPower Button Actions Pressed Power Button ResultsPower LED Indications 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 Changeable Splash Screen ROM FlashingUpgrading Boot Functions Boot Device OrderNetwork Boot F12 Support Memory Detection and ConfigurationVisual power LED Audible speaker Meaning Boot Error CodesBoot Error Codes Client Management Functions INT15 Function ModeClient Management Functions Temperature Status System ID and ROM TypeSystem ID Numbers SubsystemSmbios Functions Type DataUSB Legacy Support Management Engine FunctionsError Messages and Codes Beep/Power LED CodesTable A-1 Beep/Power LED Codes Beeps Power LED Probable CausePower-On Self Test Post Messages Table A-2 Error Message Probable Cause Table A-2System Error Messages Table A-3 System Error Messages Probable CauseMemory Error Messages Table A-4 Memory Error Messages Probable CauseKeyboard Error Messages Table A-5 Keyboard Error Messages Probable CausePrinter Error Messages Video Graphics Error MessagesTable A-6 Printer Error Messages Probable Cause Table A-7 Video Graphics Error Messages Probable CauseDiskette Drive Error Messages Table A-8 Diskette Drive Error Messages Probable CauseSerial Interface Error Messages Table A-9 Serial Interface Error Messages Probable CauseModem Communications Error Messages Table A-11 System Status Error MessagesSystem Status Error Messages Hard Drive Error Messages Table A-12 Hard Drive Error Messages Probable CauseXx = 03, Hard drive read/write compare test Table A-13 Hard Drive Error Messages Probable Cause Table A-15 Audio Error Messages Probable Cause Audio Error MessagesTable A-14 Video Graphics Error Messages Probable Cause 17 DVD/CD-ROM Error Messages Network Interface Error MessagesDVD/CD-ROM Error Messages Table A-17 Network Interface Error Messages Probable CauseScsi Interface Error Messages 65xx-xx, 66xx-xx Table A-18 Scsi Interface Error MessagesPointing Device Interface Error Messages 8601-xx Error Messages and Codes Index NumericsIndex
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dc7900 specifications

The HP dc7900 is a well-regarded desktop solution that serves as a testament to HP's commitment to performance, reliability, and user accessibility. Introduced as part of HP’s Compaq line and designed primarily for business professionals, the dc7900 combines powerful processing capabilities with a compact form factor that suits various office environments.

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The HP dc7900 is not just a powerful desktop; it’s a versatile and dependable solution for modern businesses. With its combination of performance, expandability, and solid build quality, the dc7900 remains a relevant choice for those looking to enhance their productivity and efficiency in the workplace.