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22 Chapter 1
Power Management Functions
Device Standby Mode
T Independent power management timer for hard disk drive devices
(0-15 minutes, time step=1 minute).
T Hard disk drive goes into Standby mode (for ATA standard interface).
T Disable V-sync to control the VESA DPMS monitor.
T Resume method: device activated (Keyboard for DOS, keyboard & mouse for Windows).
T Resume recovery time: 3-5 sec.
Global Standby Mode
T Global power management timer (2-120 minutes, time step=10 minute).
T Hard disk drive goes into Standby mode (for ATA standard interface).
T Disable H-sync and V-sync signals to control the VESA DPMS monitor.
T Resume recovery time: 7-10 sec.
Suspend Mode
T Independent power management timer (2-120 minutes, time step=10 minutes) or pushing external
switch button
T CPU goes into SMM.
T CPU asserts STPCLK# and goes into the Stop Grant State.
T LED on the panel turns amber color.
T Hard disk drive goes into SLEEP mode (for ATA standard interface).
T Disable H-sync and V-sync signals to control the VESA DPMS monitor.
T Return to original state by pushing external switch button.
Suspend to RAM
T The system context is maintained in system memory
T Power is shut to non-critical circuits.
T Memory is retained, and refreshes continually.
T All clocks shut except RTC.
T Return to original state by pushing external switch button & “PME” events at ACPI mode.