Intel ETX CD manual Important Technology Information, I/O Apic vs 8259 PIC Interrupt mode

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7 Important Technology Information

7 Important Technology Information

The following technological information is designed to give the reader a better understanding of some of features of the ETX®-CD. This information can be referenced when reading the System Resources and BIOS Operation sections that follow. There are also references to additional documentation that will help to develop a better understanding of the technical information described herein.

7.1I/O APIC vs 8259 PIC Interrupt mode

The I/O APIC (Advanced Programmable Interrupt Controller) handles interrupts differently then the 8259 PIC. The following information explains these differences. The ETX®-CD only supports the APIC mode of interupt handling.

7.1.1Method of interrupts transmission

The I/O APIC transmits interrupts through the system bus and interrupts are handled without the needs for the processor to run an interrupt acknowledge cycle.

7.1.2Interrupt priority

The priority of interrupts in the I/O APIC is independent of the interrupt number.

7.1.3More interrupts

The I/O APIC in the chipset of the ETX®-CD supports a total of 24 interrupts.

The APIC is not supported by all operating systems. Only Windows Xp supports APIC.

For more information see chapter 8 of the IA-32 Intel Architecture Software Developer’s Manual, Volume 3.

7.2Thermal Monitor and Catastrophic Thermal Protection

The Thermal Monitor within the Intel® processors helps to control the processor temperature by activating the TCC (Thermal Control Circuit) when the processor silicon reaches its maximum operating temperature. The temperature at which the Intel® Thermal Monitor activates the TCC is not user- configurable and is not software visible.

The Thermal Monitor controls the processor temperature by modulating (starting and stopping) the CPU core clocks at a 50% duty cycle (TM1) or by initiating an Enhanced Intel SpeedStep technology transition (TM2)* when the processor silicon reaches its maximum operating temperature (selectable in setup).

Note: TM2 is the recommended mode for the Intel® Core Duo® and Core2Duo® processors. *Not supported on the ETX®-CD with the CM 423.

Thermal Monitor supports two modes to activate the TCC: Automatic and On-Demand mode. The Intel Thermal Monitor Automatic Mode must be enabled via BIOS for the processor to be operating within specification.

Kontron User's Guide ETX CD

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Contents Document Revision All not approved entries are marked ETX CDThis page intentionally left blank Table of Contents Kontron Users Guide ETX CD Connector X4 IDE 1, IDE 2, Ethernet, Miscellaneous10.3 10.110.2 10.2.1User Information Asia Europe North/South America Technical Support2x Serial ATA Sata 1x Parallel ATA IDE IntroductionETX-CD IntroductionETX Benefits ETX DocumentationFunctional Specifications SpecificationsEnhanced Intelligent Drive Electronics Eide Intel ICH7 System MemorySerial Digital Video Output Sdvo Intel 945GM PCI 32 Intel ICH7AC ’97 Audio Intel 945GM Bios Phoenix, 1MB Flash-BIOS in Firmware Hub Flash MemoryTrustes Platform Module TPM Block diagram Electrical Specifications Mechanical SpecificationsCmos Battery Power Consumption Power Consumption Windows XP SP2ETX-CD Core Duo Processor T2500 Humidity Environmental SpecificationsTemperature MtbfSpecifications ETX connectors ETX connectorsConnector Locations General Signal DescriptionPin Signal Connector X1 PCI bus, USB, AudioPin 1-50 Power PCI USB Audio Connector X1 Signal LevelsPin Signal Description Type Termination Comment Pin Signal Description Pin 51-100 Power PCI USB AudioType Termination Comment Audio Connector X1 Signal Description3V Power Supply for External Components PCI BusConnector X2 ISA Bus Pin 1-50 Power ISA Connector X2 Signal LevelsPin 51-100 Power ISA Lvds Interface Pinout Jili Connector X2 Signal DescriptionISA Bus Slot Flat-Panel InterfacesParallel Port / Floppy Interfaces Parallel Port Mode Pinout Floppy Support Mode PinoutDCD1# SLCT# WGATE# DSR1# Msclk CTS1# Msdat TXD1 Kbclk Pin 1-50 Power VGA Lcdtv Connector X3 Signal LevelsPin 51-100 Power COM LPT Floppy KB/MS/IR PS/2 Keyboard Connector X3 Signal DescriptionVGA Output Serial Ports 1Parallel Port IrDAFloppy Connector X4 IDE 1, IDE 2, Ethernet, Miscellaneous Connector X4 SubsystemsPin 1-50Power IDE Ethernet Power control Misc Connector X4 Signal LevelsPin Signal Description Type IDE Ports Connector X4 Signal DescriptionPower Control Power ManagementMiscellaneous Circuits Feature Connector J11Sdvo Connector and Flat Foil Cable Sdvo OutputPinout Feature Connector J11 Bios RequirementsPin Pin on ETX-CD Description Reserved Configuration Special FeaturesWatchdog Timer Special FeaturesDesign Considerations Heatspreader DimensionsDesign Considerations Thermal ManagementPage Important Technology Information I/O Apic vs 8259 PIC Interrupt modeThermal Monitor and Catastrophic Thermal Protection Summary Processor Performance ControlActive Cooling Critical Trip Point ETX-CD onboard Fan connectorSchematics of Fan control Passive CoolingPinout Kontron Users Guide ETX CD Location and Pinout of Fan connector J6Electrical characteristics Bios SettingsVcc = Imax continuous = 68 a Imax pulsed = Processor Clock Throttling Acpi Suspend Modes and Resume EventsPage System Resources 8259 PIC modeInterrupt Request IRQ Lines Apic mode Direct Memory Access DMA ChannelsUsed For Available Available for PCI Comment Inter-IC I2C Bus Memory AreaI/O Address Map Peripheral Component Interconnect PCI DevicesJILI-I2C Bus Limitations LimitationsISA Bus WindowsStart Phoenix Bios Setup Utility Bios OperationDetermining the Bios Version Setup GuideGeneral Help Window Selecting an ItemDisplaying Submenus Item Specific Help WindowInfo Screen Bios Setup MenusMain Menu DisabledAuto IDE Channels SubmenuAdvanced Advanced Chipset Control CPU Control Feature bit to always returnChipset control DefaultDvmt Integrated VideoISA Options Other PCI/PNP ConfigurationPCI/PNP ISA UMB Region Exclusion PCI/PNP ISA IRQ Resource Exclusion Write Protect Cache MemoryDevice Configuration Lan Options IRQ4 Super I/O Controller OptionsUSB ports Console Redirection 30/sec Keyboard Features SubmenuHardware Monitor Watchdog Settings CRT + LFP Display ControlMiscellaneous Submenu Security Menu Yes Power MenuPOR CPU Thermal Control CircuitFeature Option Descpription Boot MenuExit Menu Feature DescriptionCannot flash when memory managers are present Updating or Restoring BiosPreventing Problems When Updating or Restoring Bios Jida Information Appendix a Jida StandardAppendix a Jida Standard 12.1.2 PCI/104 12.1.1 ISA, Standard PS/2 ConnectorsAppendix B PC Architecture Information Buses12.2.3 USB Ports12.2.1 RS-232 Serial Serial ATAKontron Users Guide ETX CD Appendix C Document Revision Appendix C Document RevisionRev. Date Author Changes