Specifications

Chapter 3 Hardware
56 Reference Manual ReadyBoard 800
Power and Sleep States
The following information only applies if an ATX power supply is used to provide power to the
ReadyBoard 800. If a non-ATX power supply is used, then the ReadyBoard 800 is only controlled by
the Power On/Off switch on the power supply and the various sleep states are not available. The sleep
states are OS dependent and not available if your OS does not support power management based on the
ACPI standard.
Power On Switch
The Power On switch turns the ReadyBoard 800 and its attached power supply to a fully On condition, if
you are using an ATX power supply. Normally, if the operating system (OS) supports sleep states, the
OS will turn Off the ReadyBoard and its power supply during the OS shut down process. If the OS
supports sleep states, the Power On button typically, will also transition the ReadyBoard and its power
supply between a fully Powered On state, various sleep states depending on the OS control setting, and a
fully Powered Off state. If the OS does not support sleep states, then the Power On button only turns
power On or Off to the ReadyBoard 800.
An OS supporting ACPI, typically allows the Power-On switch to be configured through a user
interface. The Power-On switch for the ReadyBoard 800 is provided externally by connecting a
momentary switch between pins-1 and -2 on the Utility connector (J12). The power on signal occurs
when ground is placed on pin-1 of J12.
Sleep States (ACPI)
The ReadyBoard 800 supports the ACPI (Advanced Configuration and Power Interface) standard, which
is a key component of certain Operating Systems’ (OS’s) power management. The supported features
(sleep states) listed here are only available when an ACPI-compliant OS is used for the operating
system, such as Windows 2000/XP. The term “sleep” state refers to a low latency (reduced power
consumption) state, which can be re-started (awakened) restoring full operation to the ReadyBoard 800.
If a computer is in one of the various sleep states, the computer appears to be off, indicated by such
things as no display on the attached monitor and no activity for the connected floppy drive, CD-ROM, or
hard drives. Normally, when a computer is in one of the various sleep states and it detects certain
activity (i.e. power switch, mouse, keyboard, or certain types of LAN activity), it returns to a fully
operational state.
NOTE The ReadyBoard 800 supports various wake-up activities , including
the Power-On switch to wake the ReadyBoard 800 from a powered
down state, such as Standby (S1), Hibernate (S4) and Power Off (S5).
The ReadyBoard 800 supports 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 OS and the settings in BIOS Setup.
• 1st state is normal Power On (S0).
♦ To go to a fully powered on state, the ReadyBoard 800 must either be powered Off (S5), or in a
sleep state (S1 or S4), and then the Power-On switch is pressed for less than 4 seconds (default).
♦ The ReadyBoard 800 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 there are very few internal operations taking placing, except for the internal RTC
(real time clock), the Power On LED, and the contents of RAM. This includes no activity for the
CPU, CD-ROM, or hard disk drives. The ReadyBoard 800 appears to be off except for the
Power On LED.