76
8175 N/B MAINTENANCE
8175 N/B MAINTENANCE
Exception -Note, when APM is disabled, BIOS should disable all timers and not to automatically
power manage devices. Furthermore, the APM BIOS will neither response to CPU Idle
Function, nor recognize the time periods set for Standby and Suspend in SCU.
System States:
Full On -Full running state, the system is in optimized performance
Idle -No Idle mode support in this situation .
Standby -Same as S1/S2 above
Suspend
-Same as S3 above (Including save-to-ram and power-on-suspend)
1.5.9.5 Definitions when no APM or ACPI engaged
Standby -When all the devices have no system activities for a specific time period, BIOS will
inform a standby event once OS calls GetPMEvent Function.
Suspend -When all the devices have no system activities for a specific time period, BIOS will
inform a suspend event once OS calls GetPMEvent Function.
Activities -System activities is defined in SCU one by one. SCU also includes two columns for the
time periods for Standby and Suspend. In addition, Keyboard activity is always one of
the system activities. Whenever any system activities detected, timers for Standby and
Suspend are reloaded into the value specified. By the way, RTC could also
programmable to wake up the system from Standby and Suspend states.
Event Notifications: