Ampro Corporation MightyBoard 821 manual Sleep States Acpi

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Chapter 3

Hardware

The Power-On Switch is provided externally by connecting a momentary switch between pins 1 and 2 on the Utility connector (J17). The Power-On signal occurs when ground is placed on pin 6 of J17.

Sleep States (ACPI)

The MightyBoard 821 supports the ACPI (Advanced Configuration and Power Interface) standard, which is a key component of certain Operating Systems’ power management. The supported features (sleep states) listed here are only available when an ACPI-compliant OS is used for the MightyBoard, such as Windows 2000/XP. The term “sleep” state refers to a reduced power consumption state, which can be re-started (awakened), restoring full operation to the MightyBoard 821.

In these various sleep states, the MightyBoard 821 appears to be off, indicated by such things as no display on the attached monitor and no activity for the connected CD-ROM or hard drives. However, when the MightyBoard 821 detects certain types of activity (i.e. power button, mouse, keyboard, or LAN activity), it returns to a fully operational state. The type of activity detected is based on those supported by the MightyBoard 821.

The MightyBoard 821 supports at least four ACPI power states, depending on the operating system used and its ability to manage sleep states. Typically, the Power-On switch is used to wake up from a sleep state, or transition from one state to another, but this is dependent on the operating system.

•1st state is normal Power-On (S0).

♦To go to a fully powered on state, the MightyBoard 821 must either be powered Off (S5), or in a sleep state (S1 or S4), and then the Power On/Off switch is pressed for less than 4 seconds (default).

♦The MightyBoard 821 can transition from this state (S0) to the various states described below, depending on the power management capability of the OS and how it is programmed.

•2nd state is a standby state (S1).

In this state, no internal operations take place except for the internal RTC (real time clock) and the contents of RAM. This typically includes no activity for the CPU, CD-ROM, or hard disk drives. The CPU may be active, and the peripheral devices may power down if no signals occur or power to the device(s) is not provided. The MightyBoard 821 appears to be off including the Power-On LED.

♦Normally, to enter this sleep state, the MightyBoard 821 must be fully powered on (S0) while the OS transitions the MightyBoard into this standby state (S1) under user control.

♦To exit this sleep state, typically the power button is used to wake up the MightyBoard 821 to restore full operation, including the Power-On LED. Typically, pressing the power switch for less than 4 seconds (default) will restore full operation.

•3rd state is Suspend to RAM or Standby [Windows] (S3).

In this state, main memory (RAM) and the internal RTC (real time clock) are the only devices where power is maintained. This state (Suspend to RAM) stores the state of the operating prior to shutdown including all open applications and open documents, etc. in main memory. This allows users to resume their work exactly where they left off just prior to entering this state (S3) when the system restores power and the contents of main memory.

This state takes longer to restore and uses less power than S1 or S2, but if AC power is completely lost, the contents of main memory (RAM), including any changes to documents or data stored in RAM during S3, is also lost.

♦To enter the Suspend to RAM (S3) or Standby state, the computer must be fully powered on and the OS transitions the computer into this sleep state under user control.

♦To exit this sleep state, typically pressing the Power On switch for less then 4 seconds (default) will restore full operation.

•4th state is a hibernate or suspend-to-disk state (S4).

In this state, no internal operations take place, except for the internal RTC. This includes no activity for the CPU, CD-ROM, or hard disk drives. The MightyBoard 821 appears to be off, including the external

MightyBoard 821

Reference Manual

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Contents MightyBoard Single Board Computer Reference Manual Audience Contents Appendix a About This Manual SpecificationsPurpose of this Manual ReferencesChapter MightyBoard Architecture Product OverviewProduct Description Board FeaturesChapter Chapter Major Components ICs Block DiagramChip Type Mfg Model Description Function U10Jack # Signal Description Connector and Header DefinitionsJ16 J15 J17 J18J9 J6 J20 J21 J22 JP1 BT1 Additional ComponentsSpecifications Power SpecificationsJumper Definitions Environmental Specifications Thermal/Cooling RequirementsHumidity Physical Specifications Mechanical SpecificationsDimension Reference Manual MightyBoard Overview HardwareInterrupt Channel Assignments Memory MapDevice vs IRQ No Base Address Function Address MapAddress hex Subsystem CF8-CFFRS485 Serial Port Implementation Serial InterfacesPin # Signal Description Keyboard Interface Keyboard/Mouse InterfacesMouse Interface USB InterfacesUSB 2.0 Support Legacy USB SupportAudio Interface Video InterfacesUSBP4+ Lvds Interface Pin # Signal Description Line ChannelUtility Interface Temperature Monitoring External Battery BT1User Gpio Signals J8 MiscellaneousEthernet External LED Serial ConsoleInfrared IrDA Port Watchdog Timer Power InterfacesATX Power Supply Interface Irrx GNDPower-On Switch Power and Sleep StatesOptional CPU Fan Optional System FanSleep States Acpi Chapter Hardware Entering Bios Setup VGA Display Bios SetupEntering Bios Setup Remote Access IntroductionLogo Screen Image Requirements Logo screenMethod Contact Information Appendix a Technical SupportAppendix a
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