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Theory of Operation 4-13
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.
4.3.2.2 ALI M6377 (Power Management Unit)
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Three operation states
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ON state
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DOZE state
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SLEEP state
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Programmable DOZE and SLEEP timers
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Programmable EL timer for backlight control
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Three output pins depending on operation state, each pin is programmable and power configurable.
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Provide system activity monitoring, including:
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video
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hard disk
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floppy disk
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serial port
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keyboard
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parallel port
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two programmable I/O groups activity monitor, each group contains 16/8 I/O addresses.
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one predefined I/O group activity monitor
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Multiple external wake up events from DOZE and SLEEP states
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External push button
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RTC alarm
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Two levels battery warning monitor
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AC power monitoring to disable PMU function