10 Chapter 1
Power Management Function(ACPI support function)
Device Standby Mode
• Independent power management timer for hard disk drive devices(0-15 minutes,time step=1minute).
• Hard Disk drive goes into Standby mode(for ATA standard interface).
• Disable V-sync to control the VESA DPMS monitor.
• Resume method:device activated (keyboard for DOS, keyboard &mouse for Windows.
• Resume recovery time 3-5sec.
Global Standby Mode
• Global power management timer(2-120minutes,time step=10minute).
• Hard disk drive goes into Standby mode(for ATA standard interface).
• Disable H-sync and V-sync signals to control the VESA DPMS monitor.
• Resume method: Resume to original state by pushing external switch Button,modem ring in,keyboard
an mouse for APM mode.
• Resume recovery time :7-10sec
Suspend Mode
• Independent power management timer(2-120minutes,time step=10minute)or pushing extern switch
button.
• CPU goes into SMM
• CPU asserts STPCLK# and goes into the Stop Grant State.
• LED on panel turns amber colour.
• Hard disk drive goes into SLEEP mode (for ATA standard interface).
• Disable H-sync and V-sync signals to control the VESA DPMS monitor.
• Ultra I/O and VGA chip go into power saving mode.
• Resume method: Resume to original state by pushing external switch Button,modem ring in,keyboard
an mouse for APM mode
• Return to original state by pushing external switch button,modem ring inand USB keyboard for ACPI
mode.
ACPI
• ACPI specification 1.0b
• S0,S1,S2 and S5 sleep state support.
• On board device power management support.
• On board device configuration support.
