Power Management Modes - Teknor Industrial Computers VIPer807 Technical Reference Manual

9.02 POWER MANAGEMENT MODES

The VIPer807 supports a very flexible and powerful power management scheme. The
System Controller provides progressively higher levels of power conservation whenever
the system is idle through the following special power saving modes: Doze Mode, Sleep
Mode and Suspend Mode (power management test results are given in Table A-2 on page
A-2). These modes are fully programmable through the AMIBIOS Setup Program.
The CPU power consumption is reduced through the STOPCLOCK protocol, which is
used to shut down the CPU's internal clock during the various power management modes.
In general, each progressive level of power management is entered when inactivity is
detected by the System Controller which monitors activity from the Keyboard, Video,
Serial and Parallel I/O, and the Hard and Floppy Drives.
The timeouts which are used to enter into Doze Mode, then Sleep Mode, and finally
Suspend Mode, are programmable via the AMIBIOS Power Management Setup screen.
Each mode is described below.
9.02.1 DOZE MODE
The Doze Mode is the System Controller's first level of power conservation. During Doze
Mode, the display and hard drive will remain active. In fact, this mode is transparent to
the user. Exit from Doze Mode is by a keypress or a serial port interrupt (e.g., mouse
movement). Exit from Doze Mode is immediate.
9.02.2 SLEEP MODE
The Sleep Mode is the System Controller's second level of power conservation. During
Sleep Mode, the display becomes inactive and the hard drive motor is stopped. Exit from
Sleep Mode is by a keypress or a serial port interrupt (e.g., mouse movement). Exit from
Sleep Mode takes approximately 5 seconds.
9.02.3 SUSPEND MODE
The Suspend Mode is the System Controller's third and deepest level of power
conservation. During Suspend Mode, the display and the hard drive motor remain
inactive. Exit from Suspend Mode is via a contact closure on the J11 Suspend / Resume
Momentary Switch Connector (see Diagram 8-1) or via the RING signal from an external
modem. Thus, if Suspend Mode is to be used, a Normally Open momentary switch should
be connected to this connector. Exit from Suspend Mode takes approximately 7 seconds.
Power Management 9-2