Entering Standby Mode; Wakeup; Power And Reset Button Functionality - VersaLogic Ocelot Reference Manual

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Datasheet of VL-CBR-2012 - 20" 24-BIT LVDS CABLE
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E S
NTERING TANDBY
Standby mode can be entered through the OS (by configuring the standby settings in Power
Options Properties) or programmatically, through a function call or the execution of a shutdown
utility.
SetSystemPowerState Function
The "Power Management Reference" in the
API available for power control under Windows. The "Power Management Functions" section
provides complete information on the use of the API.
The function used to set the system power state is SetSystemPowerState. This function suspends
the system by shutting power down. Depending on the ForceFlag parameter, the function either
suspends operation immediately or requests permission from all applications and device drivers
before doing so.
BOOL SetSystemPowerState(
BOOL fSuspend,
BOOL fForce
);
Parameters:
fSuspend
[in] If this parameter is TRUE, the system is suspended. If the parameter is FALSE, the
system hibernates. This parameter is ignored in Windows Me/98/95.
fForce
[in] If this parameter is TRUE, the function broadcasts a PBT_APMSUSPEND event to
each application and driver, then immediately suspends operation. If the parameter is
FALSE, the function broadcasts a PBT_APMQUERYSUSPEND event to each
application to request permission to suspend operation.
W
AKEUP
The system will wake with one power button push. It can also wake potentially (with software
support) from the Ethernet or serial port.
P R
OWER AND ESET
The power and reset button inputs of the VL-EPMs-21 are simplified versions of those described
in ACPI Specification 2.0. There is no software interface to observe or configure their behavior.
The power button has direct control of the system power state. When the system is in the S0 state
(fully on), pressing the power button will shut off the VL-EPMs-21 and place it into the S5 state
(off). No event signal is given to the OS and the system will not wait for the OS to shutdown
before removing power to the CPU and chipset.
VL-EPMs-21 Reference Manual
M
ODE
MSDN Library
B F
UTTON UNCTIONALITY
System Features
contains complete information on the
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