Ali M6377 Power Management Unit - Acer Extensa 900 Series Maintenance Manual

4.2.11.1 ALI M6377 Power Management Unit

The major features of the ALI M6377 Power Management Unit include:
Three operation states
Programmable DOZE and SLEEP timers
Programmable EL timer for backlight control
Three output pins depending on operation state, each pin is programmable and
power configurable.
Provide system activity monitoring, including:
Video
Hard disk drive
Floppy disk drive
Serial port
Keyboard
Parallel port
Two programmable I/O groups activity monitor, each group contains 16/8
I/O addresses.
One predefined I/O group activity monitor
Multiple external wake up events from DOZE and SLEEP states
External push button
RTC alarm
Two levels battery warning monitor
Port definitions for the M6377 Chip are provided in Table 4-5.
4-22 Theory of Operation
— ON state
— DOZE state
— SLEEP state