Texas Instruments Extensa 60x Series Maintenance Manual page 59

4.3.2.2 ALI M6377 (Power Management Unit)
Three operation states
ON state
DOZE state
SLEEP state
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
floppy disk
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
AC power monitoring to disable PMU function
A simplified block diagram of the M6377 Power Management Unit is provided in Figure
4-6. The chip pinouts are provided in Figure 4-7.
Theory of Operation 4-13