Hardware Technical Specification
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clock (SUSCLK) in this suspend mode to support refresh of these memory subsystems. Only an enabled
“resume event” can bring the platform out of the suspend to RAM (STR) state.
6.2.5 Suspend to disk mode (STD)
A suspend state where the context of the entire system is saved to disk, all motherboard components are
powered-off, and all clocks are stopped. Any enabled “resume event”, such as Power switch or RTC, can
bring the platform out of the suspend to disk (STD) state.
6.2.6 Soft off mode (SOFF)
This is the same as suspend to disk except the context of memory is not saved. The system will resume
from Soft Off as if a hard reset had occurred.
6.2.7 Mechanical off mode (MOFF)
All power except the RTC has been removed from the system.
6.3 PMU mode transition event
The following table summarizes the entry events and wake-up events of each power management mode.
Power State
Entry Event
Wake up Event
Doze
Doze Time out
Predefined Memory/IO range access
Ring Indicator Keystroke
Mouse movement
IRQ 1-15
Stand by
Stand by Time out
Stand by hot key pressed
Predefined Memory/IO range access
Battery Warning
Battery Low
Ring Indicator
Keystroke
Mouse movement
Schedule Alarm
STR
Suspend Time out
STR hot key pressed
Suspend button
Battery Low
Power Button
Ring Indicator
Keystroke (Int. KB)
Schedule Alarm
STD
Suspend Time out
STD hot key pressed
Hibernate
Battery Low
Power Button
Schedule Alarm
Soft Off
Power button
Execute Windows shutdown
command
Power Button
Schedule Alarm
