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4-10 Theory of Operation
4.3.5 ALI M6377 (Powre 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 4-5. The
chip pinouts are provided in Figure 4-6.