HP 8100 Parallel Interface Support, Standard Parallel Port Mode, Enhanced Parallel Port Mode

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Input/Output Interfaces

5.4Parallel Interface Support

These systems include a system board header (J50) that supports an optional parallel bracket/cable assembly that provides a parallel interface for a peripheral device such as a printer. The parallel interface supports bi-directional 8-bit parallel data transfers with a peripheral device. The parallel interface supports three main modes of operation:

■Standard Parallel Port (SPP) mode

■Enhanced Parallel Port (EPP) mode

■Extended Capabilities Port (ECP) mode

These three modes (and their submodes) provide complete support as specified for an IEEE 1284 parallel port.

5.4.1 Standard Parallel Port Mode

The Standard Parallel Port (SPP) mode uses software-based protocol and includes two sub-modes of operation, compatible and extended, both of which can provide data transfers up to 150 KB/s. In the compatible mode, CPU write data is simply presented on the eight data lines. A CPU read of the parallel port yields the last data byte that was written.

5.4.2 Enhanced Parallel Port Mode

In Enhanced Parallel Port (EPP) mode, increased data transfers are possible (up to 2 MB/s) due to a hardware protocol that provides automatic address and strobe generation. EPP revisions 1.7 and 1.9 are both supported. For the parallel interface to be initialized for EPP mode, a negotiation phase is entered to detect whether or not the connected peripheral is compatible with EPP mode. If compatible, then EPP mode can be used. In EPP mode, system timing is closely coupled to EPP timing. A watchdog timer is used to prevent system lockup.

5.4.3 Extended Capabilities Port Mode

The Extended Capabilities Port (ECP) mode, like EPP, also uses a hardware protocol-based design that supports transfers up to 2 MB/s. Automatic generation of addresses and strobes as well as Run Length Encoding (RLE) decompression is supported by ECP mode. The ECP mode includes a bi-directional FIFO buffer that can be accessed by the CPU using DMA or programmed I/O. For the parallel interface to be initialized for ECP mode, a negotiation phase is entered to detect whether or not the connected peripheral is compatible with ECP mode. If compatible, then ECP mode can be used.

The ECP mode includes several sub-modes as determined by the Extended Control register. Two submodes of ECP allow the parallel port to be controlled by software. In these modes, the FIFO is cleared and not used, and DMA and RLE are inhibited.

 

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Contents February 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 BiosOnline Viewing IntroductionAbout this Guide Additional Information SourcesValues Serial NumberNotational Conventions Special NoticesAcronyms and Abbreviations Common Acronyms and AbbreviationsAcronym or Abbreviation Description CDS Eisa IPL Nvram Sdram Uart Introduction Introduction System OverviewFeatures SFF CMT Feature Differences by Form FactorArchitectural Differences by Form Factor System ArchitectureFunction HP Compaq 8100 Elite Business PC Architecture, Block diagram Chipset Intel Processor SupportComponent Name Function Support ComponentsSystem Memory Support Component FunctionsNetwork Interface Controller Mass StorageSerial Interface Universal Serial Bus InterfaceIntel Core i5-661 Processor Graphics SubsystemAudio Subsystem Intel Integrated Graphics Controller StatisticsParameter Operating Non-operating SpecificationsEnvironmental Specifications Factory Configuration HP ProtectTools Embedded SecurityParameter SFF CMT Power Supply Electrical SpecificationsPhysical Specifications Parameter ValueSystem Overview Processor/Memory Subsystem Architecture Processor/Memory SubsystemIntel Processor Intel Processor FeaturesSupported Processors Processor Changing/UpgradingMemory Subsystem Channel a Channel B Socket Total Memory UpgradingMemory Mapping and Pre-allocation Memory Socket LoadingSystem 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 BusPCI Bus Mastering Devices PCI Express Bus OperationSoftware/Driver Layer Transaction Protocol LayerLink Layer PCI Power Management SupportOption ROM Mapping PCI InterruptsPCI 2.3 Connector PCI ConnectorsPCI 2.3 Bus Connector Pinout PCIe Bus Connector Pinout PCIe ConnectorsMode Apic ModeSystem Resources InterruptsPCI Interrupt Distribution Direct Memory AccessClearing Cmos Real-Time Clock and Configuration MemorySecurity Functions Configuration Memory Cmos MapSystem Management Standard Cmos LocationsInterface Security Power-On / Setup PasswordSetup Password Cable Lock ProvisionAcpi Wake-Up Event System Wakes From Power ManagementSmart Cover Lock Optional Acpi Wake-Up EventsSystem Status System Status PowerLED Beeps Action RequiredSystem Operational Status LED Indications Thermal Sensing and Cooling Register Map and Miscellaneous FunctionsSystem I/O Map Port Function System I/O MapPCH-DO Functions Gpio FunctionsSIO Controller Functions Input/Output Interfaces Pin Description Pin Sata Connector Pinout SATA/eSATA Interfaces Sata interfaceESATA interface Optional eSATA Bracket/Cable AssemblyPin Signal Description DB-9 Serial Connector PinoutSerial Interface Parallel Interface Support Standard Parallel Port ModeEnhanced Parallel Port Mode Extended Capabilities Port ModeDB-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 Universal Serial Bus Interface USB Signals USB Connector Location all form factorsPCH USB Port Mapping USB Cable Length Data USB ConnectorUSB Connector Pinout USB Cable DataAudio Subsystem Audio Subsystem Functional Block DiagramHD Audio Link Bus HD Audio ControllerAudio Multistreaming HD Audio Subsystem Specifications Audio SpecificationsParameter Measurement 10. LAN LED Indications Network Interface ControllerFunction Activity LED Speed LED Wake-On-LAN Support Power Management SupportAlert Standard Format Support Parameter Compatibility standard orprotocol NIC ConnectorNIC Specifications 11. NIC SpecificationsIntegrated Graphics Subsystem Functional Description Integrated Graphics Subsystem, Block diagramSystem Available Installed Setting Memory Graphics Memory System Memory Installed Pre-allocatedAvailable Total Shared System Memory Resolution Analog Digital Integrated Graphics Controller Supported ResolutionsMaximum Refresh Rate Upgrading Analog Monitor Connector Monitor ConnectorsDB-15 Monitor Connector Pinout Pin Signal DisplayPort ConnectorIntegrated Graphics Subsystem Power Distribution Power and Signal DistributionCMT 320-Watt Power Supply Unit Specifications SFF 240-Watt Power Supply Unit SpecificationsPressed Power Button Results Power ControlPower Button Power Button ActionsPower LED Indications Condition Wake Up Events Power ManagementConsumption To S0 by Required System Power StatesPower Transition OS Restart State System ConditionCR1 +5 VDC LED Signal DistributionXBT1 System Board Connector, Indicator, and Switch DesignationsSystem Bios Upgrading ROM FlashingChangeable Splash Screen Memory Detection and Configuration Boot FunctionsBoot Device Order Network Boot F12 SupportBoot Error Codes Boot Error CodesVisual power LED Audible speaker Meaning Client Management Functions Function ModeClient Management Functions INT15 System Form Factor System ID Temperature StatusSystem ID and ROM Type System ID NumbersType Data Smbios FunctionsManagement Engine Functions USB Legacy SupportBeeps Power LED Probable Cause Error Messages and CodesBeep/Power LED Codes Table A-1 Beep/Power LED CodesPower-On Self Test Post Messages Table A-2 Error Messages and Codes Table A-3 System Error Messages Probable Cause System Error MessagesMessage Probable Cause Memory Error MessagesMemory Error Messages Table A-4Table A-5 Keyboard Error Messages Probable Cause Keyboard Error MessagesTable A-7 Video Graphics Error Messages Probable Cause Printer Error MessagesVideo Graphics Error Messages Table A-6 Printer 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 Table A-17 Network Interface Error Messages Probable Cause 17 DVD/CD-ROM Error MessagesNetwork Interface Error Messages DVD/CD-ROM Error MessagesTable 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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