HP dc7900 manual System Support, PCI Bus Overview, PCI 2.3 Bus Operation

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4

System Support

4.1Introduction

This chapter covers subjects dealing ICH10 with basic system architecture and covers the following topics:

PCI bus overview (4.2)

System resources (4.3)

Real-time clock and configuration memory (4.4)

System management (4.5)

Register map and miscellaneous functions (4.6)

This chapter covers functions provided by off-the-shelf chipsets and therefore describes only basic aspects of these functions as well as information unique to the systems covered in this guide. For detailed information on specific components, refer to the applicable manufacturer's documentation.

4.2PCI Bus Overview

This section describes the PCI bus in general and highlights bus implementation for systems covered in this guide. For detailed information regarding PCI bus operation, refer to the appropriate PCI specification or the PCI web site: www.pcisig.com.

These systems implement the following types of PCI buses:

PCI 2.3 - Legacy parallel interface operating at 33-MHz

PCI Express - High-performance interface capable of using multiple TX/RX high-speed lanes of serial data streams

4.2.1 PCI 2.3 Bus Operation

The PCI 2.3 bus consists of a 32-bit path (AD31-00 lines) that uses a multiplexed scheme for handling both address and data transfers. A bus transaction consists of an address cycle and one or more data cycles, with each cycle requiring a clock (PCICLK) cycle. High performance is achieved during burst modes in which a transaction with contiguous memory locations requires that only one address cycle be conducted and subsequent data cycles are completed using auto-incremented addressing.

Devices on the PCI bus must comply with PCI protocol that allows configuration of that device by software. In this system, configuration mechanism #1 (as described in the PCI Local Bus specification Rev. 2.3) is employed.

 

Technical Reference Guide

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Contents September Technical Reference GuideTechnical Reference Guide Contents System Support Processor/Memory SubsystemInput/Output Interfaces Integrated Graphics Subsystem Power and Signal DistributionError Messages and Codes Index System BiosAbout this Guide IntroductionAdditional Information Sources Online ViewingNotational Conventions Serial NumberSpecial Notices ValuesAcronyms and Abbreviations Acronym or Description Common Acronyms and AbbreviationsCGA CDSCMC CmosEPP EisaEide EscdISA IRQLAN LCDPAL ODDPata PCASEC SdvoSecam SgramAcronym or Abbreviation Description Acronyms and AbbreviationsIntroduction Introduction System OverviewFeatures Sodimm Dimm Feature Difference Matrix by Form Factor1ODD Architectural Differences By Form Factor System ArchitectureFunction HP Compaq dc7900 Business PC Architecture, Block diagram Intel Processor Support Chipset Components and Functionality ChipsetComponents Function System Memory Support ComponentsSupport Component Functions Component Name FunctionSerial Interface Mass StorageUniversal Serial Bus Interface Network Interface ControllerAudio Subsystem Graphics SubsystemIntegrated Graphics Subsystem Statistics Integrated Graphics ControllerEnvironmental Specifications Factory Configuration SpecificationsPower Supply Electrical Specifications Parameter Operating Non-operatingParameter Usdt SFF CMT Physical SpecificationsHP SuperMulti LightScribe Optical Drive SpecificationsParameter CD-RW/DVD-ROM ComboParameter 80 GB 160 GB 250 GB Hard Drive SpecificationsProcessor/Memory Subsystem Architecture Processor/Memory SubsystemIntel Processor Overview Intel ProcessorsSupported Processors partial listing Processor Changing/UpgradingClock FormMemory Subsystem Memory Mapping and Pre-allocation Memory UpgradingMemory Socket Loading Channel a Channel B Socket Socket 2 Socket 4 TotalSystem Memory Map for maximum of 8 gigabytes PCI Bus Overview System SupportPCI 2.3 Bus Operation PCI Component Function # Device # Wired to PCI Component Configuration Access PCI BusSoftware/Driver Layer PCI Express Bus OperationTransaction Protocol Layer PCI Bus Mastering DevicesOption ROM Mapping PCI Power Management SupportPCI Interrupts Link LayerPCI 2.3 Connector PCI ConnectorsPCI 2.3 Bus Connector Pinout PCI Express Bus Connector Pinout PCI Express ConnectorsSystem Resources Apic ModeInterrupts ModePCI Interrupt Distribution Direct Memory AccessClearing Cmos Real-Time Clock and Configuration MemorySystem Management Configuration Memory Cmos MapStandard Cmos Locations Security FunctionsSetup Password Power-On / Setup PasswordCable Lock Provision Interface SecuritySmart Cover Lock Optional Power ManagementAcpi Wake-Up Events Acpi Wake-Up Event System Wakes FromSystem Status System Status PowerLED Beeps Action RequiredThermal Sensing and Cooling System Operational Status LED IndicationsSystem I/O Map Register Map and Miscellaneous FunctionsPort Function System I/O MapICH10 Functions Gpio FunctionsSIO Controller Functions Input/Output Interfaces SATA/eSATA Interfaces Pin Sata Connector PinoutSata interface Pin DescriptionESATA interface Optional eSATA Bracket/Cable AssemblyDiskette Drive Interface Pin Signal Description Pin Diskette Drive Connector PinoutSerial Interface DB-9 Serial Connector PinoutEnhanced Parallel Port Mode Standard Parallel Port ModeExtended Capabilities Port Mode Parallel Interface SupportDB-25 Parallel Connector Pinout Parallel Interface ConnectorPin Signal Function Keyboard Interface Operation Keyboard/Pointing Device InterfaceKeyboard/Pointing Device Connector Pinout Keyboard/Pointing Device Interface ConnectorPointing Device Interface Operation DataController Signals USB Connector Location all form factors USB ConnectorUniversal Serial Bus Interface ICH10 USB Port MappingUSB Cable Data USB Connector PinoutUSB Cable Length Data USB Color CodeAudio Subsystem Audio Subsystem Functional Block DiagramHD Audio Link Bus HD Audio ControllerAudio Multistreaming HD Audio Subsystem Specifications Audio SpecificationsParameter Measurement ADC/DACLED Network Interface ControllerWake-On-LAN Support Power Management SupportAlert Standard Format Support NIC Specifications NIC ConnectorNIC Specifications Parameter Compatibility standard orprotocolIntegrated Graphics Subsystem RGB Functional DescriptionGMA 4500 Memory Allocation Sdram Installed Maximum Memory AllocationDisplay Modes Resolution Maximum Refresh Rate Analog Digital MonitorIGC Standard 2D Display Modes Upgrading Analog Monitor Connector Monitor ConnectorsDB-15 Monitor Connector Pinout Pin Signal DisplayPort ConnectorIntegrated Graphics Subsystem Power Distribution Power and Signal DistributionUsdt Power Distribution Usdt 135-Watt Power Supply Unit Specifications 2 SFF/CMT Power DistributionMin Range Current Max Surge Tolerance Loading Ripple SFF 240-Watt Power Supply Unit SpecificationsRange or Min Current Max Surge Tolerance Loading Ripple CMT 365-Watt Power Supply Unit SpecificationsEnergy Star Compliancy Shows the power supply cabling for CMT systemsPower Button Power ControlPower Button Actions Pressed Power Button ResultsPower LED Indications Condition Wake-On-LAN Wake Up EventsPower Transition OS Restart System Power StatesState System Condition Consumption To S0 by RequiredCR1 +5 VDC LED Signal DistributionSystem Board Component Designations Power and Signal Distribution System Bios Upgrading ROM FlashingChangeable Splash Screen Boot Device Order Boot FunctionsNetwork 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 System ID and ROM Type Temperature StatusSystem ID Numbers SubsystemType Data Smbios FunctionsManagement Engine Functions USB Legacy SupportBeep/Power LED Codes Error Messages and CodesTable A-1 Beep/Power LED Codes Beeps Power LED Probable CausePower-On Self Test Post Messages Table A-2 Table A-2 Error Message Probable CauseTable A-3 System Error Messages Probable Cause System Error MessagesTable A-4 Memory Error Messages Probable Cause Memory Error MessagesTable A-5 Keyboard Error Messages Probable Cause Keyboard Error MessagesVideo Graphics Error Messages Printer Error MessagesTable A-6 Printer Error Messages Probable Cause Table A-7 Video Graphics Error Messages Probable CauseTable A-8 Diskette Drive Error Messages Probable Cause Diskette Drive Error MessagesTable A-9 Serial Interface Error Messages Probable Cause Serial Interface Error MessagesModem Communications Error Messages System Status Error Messages System Status Error MessagesTable A-11 Table A-12 Hard Drive Error Messages Probable Cause Hard Drive Error MessagesXx = 03, Hard drive read/write compare test Table A-13 Hard Drive Error Messages Probable Cause Table A-14 Video Graphics Error Messages Probable Cause Audio Error MessagesTable A-15 Audio Error Messages Probable Cause Network Interface Error Messages 17 DVD/CD-ROM Error MessagesDVD/CD-ROM Error Messages Table A-17 Network Interface Error Messages Probable CauseTable A-18 Scsi Interface Error Messages Scsi Interface Error Messages 65xx-xx, 66xx-xxPointing Device Interface Error Messages 8601-xx Error Messages and Codes Numerics IndexIndex
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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.

One of the standout features of the HP dc7900 is its robust configuration options. It typically comes equipped with Intel's Core 2 Duo or Quad processors, giving users the ability to handle demanding applications seamlessly. The inclusion of Intel's technologies, such as Intel vPro, enhances remote management and IT control, making it an ideal choice for businesses looking to streamline their operations.

The dc7900 is designed with flexibility in mind. It offers multiple form factors, including mini-tower, small form factor, and ultra-slim desktop configurations. This variety enables organizations to choose a model that best fits their workspace requirements, maximizing both efficiency and aesthetics. The small footprint models are particularly beneficial in space-constrained environments, while the mini-tower version provides expandability for future upgrades.

In terms of graphics capabilities, the HP dc7900 typically features integrated Intel graphics, with options to install discrete graphics cards for users who require enhanced visual performance. This makes the dc7900 suitable for tasks ranging from standard office applications to more graphics-intensive responsibilities.

Connectivity is another key characteristic of the HP dc7900. It is equipped with a variety of ports, including USB 2.0 and audio jacks, allowing users to connect peripherals easily. Additionally, the dc7900 supports legacy connections, making it easier for businesses with older equipment to integrate new systems without hassle.

Durability and reliability are hallmarks of the HP dc7900. Built with high-quality materials and subjected to rigorous testing, this desktop is designed to withstand the demands of a bustling office environment. Furthermore, HP's comprehensive warranty and support options assure businesses of the reliability of their investment.

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.