Ampro Corporation XTX 820 manual Watchdog Timer WDT

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Chapter 3

Hardware

To ensure the impact on processor performance is reduced to a minimum, the TCC can only be active for short periods of time, which requires a properly designed thermal solution. The Intel Pentium/Celeron M processor datasheet can provide you with more information.

The thermal trip signal is used by Intel's Pentium/Celeron M processors for catastrophic thermal protection. If the processor's silicon reaches a temperature of approximately 125°C then the processor's thermal trip signal will go active and the system will automatically shut down to prevent any damage to the processor as a result of overheating. The thermal trip signal activation is completely independent from processor activity and therefore does not produce any bus cycles.

NOTE

An ATX power supply is required to make use of the thermal trip

 

signal and automatically switch off the system.

Watchdog Timer (WDT)

The watchdog timer (WDT) restarts the system if an error or mishap occurs, allowing the system to recover from the mishap, even though the error condition may still exist. Possible problems include failure to boot properly, the application software’s loss of control, failure of an interface device, unexpected conditions on the bus, or other hardware or software malfunctions.

The WDT (watchdog timer) can be used both during the boot process and during normal system operation.

•During the Boot process – If the operating system fails to boot in the time interval set in the BIOS, the system will reset.

The watchdog timer (WDT) is enabled and configured in the BIOS Setup Utility screen, Advanced BIOS Features. Set the WDT for a time-out interval in seconds or minutes (between 30 sec to 30 min) in the Advanced BIOS Features screen. Ensure you allow enough time for the boot process to complete and for the OS to boot. The OS or application must tickle (reset) the WDT before the timer expires. This can be done by accessing the hardware directly or through a BIOS call.

•During System Operation – An application can set up the WDT hardware through a BIOS call, or by accessing the hardware directly. Some Ampro Board Support Packages provide an API interface to the WDT. The application must tickle (reset) the WDT before the timer expires or the system will be reset.

•Watchdog Setup – Ampro has provided a System Utility which helps you set up the WDT. The System Utility and its user guide are located on the XTX 820 Doc & SW CD-ROM. Refer also to Ampro's Watchdog Timer Application Note.

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Reference Manual

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Contents XTX Computer On Module Reference Manual Audience Assumptions Contents Index List of Figures List of Tables Reference Manual XTX Specifications Purpose of this ManualReference Material XTX 820 Support Products Related Ampro ProductsAmpro XTX Products Ampro ETX ProductsOther Ampro Products Chapter ETX→ Concept and XTX Extension Chapter Product OverviewHardware Design Path Product DescriptionBoard Features Chapter Chapter COM1 COM2 Block DiagramGmhc Major Integrated Circuits ICsChip Type Mfg Model Description Function CPUSignals Description Connector DefinitionsDimension SpecificationsPhysical Specifications Mechanical SpecificationsParameter GHz ULV Celeron GHz LV Pentium M Characteristics Power SpecificationsEnvironmental Specifications Thermal/Cooling SolutionsOverview HardwareMemory CPU U1Size Memory MapAvailable Typical Interrupt Source Connected to Pin Address Range Decimal Hex0CFC 0CFF Address MapAddress Range Size Description Decimal Hex Address hex Size Available DescriptionPin # PCI Bus Interface Connector J1Signal PCI BusFrame GNTPME DevselAD6 GNDAD9 CBE0CBE2 CLKREQ CBE3CBE1 Serial Interrupt Request Signal Description Pin #J1 Pin # Signal Description Universal Serial Bus USBPin # Signal Description Serirq GNT0VCC0 VCC1Reserved AoutrVCC2 VCC3VCC5 VCC4PCI Express/ExpressCards PCI Express Interface J2Additional Universal Serial Bus USB Ports Serial ATAExtended System Management LPC InterfaceFanpwmout PCIGNT#APCIREQ#A FantachoinEXC1RST# Fan tachometer input Signal 34-Pin Description Pin # Cable Primary I/O Interface J3Floppy Port Parallel Port Signal DB25 Description Pin #Serial Ports 1 CTS2 Infrared IrDA PortPS/2 Keyboard PS/2 MouseVideo Engine Internal Graphics FeaturesVideo Interface CRT InterfaceLvds Interface J3 Pin # Signal Description TV Out Component and S-Video Comp Floppy Write Protect Senses the diskette is write protected MOT DRVIDE Ports IDE and Auxiliary Interface J4Cblidp PideiowPideior PiderdyActled Ethernet Port InterfaceTX+ LiledPower Control Signals Power Management SignalsSpeaker SMBus I2C Bus Real Time Clock RTC/BatteryMatrix Component Address Binary GPE1 I2DATGND2 GND4GND5 GND7VCC6 TXD GPE2 RXD RXD+Sdvo Port MiscellaneousTemperature Monitoring Serial Console Remote AccessWatchdog Timer WDT Pwrok Power InputPower and Sleep States Power-On SwitchSleep States Acpi Signal/Device Condition Wake Up ActivitiesGEP1 Introduction Accessing Bios Setup Utility VGA DisplayBios Setup Utility Menu Item/Topic Accessing Bios Setup Utility Remote AccessESC Bios MenusBios Main Setup Screen Key DescriptionAcpi Configuration Bios Advanced Setup ScreenPCI IRQ Resource Exclusion PCI ConfigurationFlat Panel Resolution BITs Auto Parallel ATA in Enhanced/Native ModeSerial ATA in Enhanced/Native Mode Azalia Intel High Definition Audio Graphics ConfigurationChipset Configuration CPU ConfigurationInterface Configuration PCI Express ConfigurationClock Configuration Primary IDE Master Not Detected or Device Type IDE ConfigurationChapter Bios Setup Utility Secondary IDE Master Not Detected or Device Type Primary IDE Slave Not Detected or Device TypeThird IDE Master Not Detected or Device Type Secondary IDE Slave Not Detected or Device TypeFourth IDE Master Not Detected or Device Type Third IDE Slave Not Detected or Device TypeFourth IDE Slave Not Detected or Device Type Module Version USB Devices Enabled Drives None USB ConfigurationUSB Mass Storage Device Configuration Bios Post Keyboard/Mouse ConfigurationHardware Health Configuration Watchdog ConfigurationHardware Health Event Monitoring Chapter Bios Setup Utility Bios Boot Setup Screen Boot Priority Selection Device Based or Type BasedBoot Device Priority Boot Settings Configuration Loss Control feature To clear Supervisor password Bios Security Setup ScreenHard Disk Security APM Bios Power Setup ScreenChapter Bios Setup Utility Exit Options Bios Exit Setup ScreenLoading Defaults Reference Manual XTX Method Contact Information Appendix a Technical SupportAppendix a Appendix B LAN Boot Feature Initializing Intel R Boot Agent FE PXE v2.0 Build 0xx WfM Accessing the LAN PXE Boot FeaturePress F12 if you want to boot from the Network Alternate Method of Selecting LAN BootReference Manual XTX J6 Sdvo Appendix C Connector Part NumbersAppendix C PCI AcpiUSB CD-ROMRTC Real Time Clock RTC Reference material WDT
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