Theory of Operation
4-5
— On Mode
— Doze Mode
— Sleep Mode
— Suspend Mode
— Auto Power Reduction Mode (APR)
— Word Processing Mode (WP)
— All Register Read/Writeable for 0V Suspend
— Microsoft APM Compatible
— Supports 0V Suspend
— Demand Driven Clock Control
— Supports Resume/Suspend Key
— Auto Wake-Up Function
— Three Low Battery Monitor Input
— System Operating Voltage from 3V to 5.5V
— Low Power Consumption (at 3.3V)
— 50mA at Full On Mode
— 25mA at Doze Mode
— 100
µ
A at SUSPEND Mode
— 15
µ
A at POWER-OFF Mode with RTC active
4.2.4 Video Subsystem
The video subsystem is implemented on the VGA Video Board and on the System
Board Assemblies.
The notebook contains a built-in 10.4-inch (or larger) LCD and features simultaneous
LCD and external VGA display.
The video subsystem includes a 1.5 MB DRAM memory, 32-bit DRAM bus, and
separate display and memory clocks. An additional frame buffer/accelerator DRAM
increases the available memory band width for CPU accesses. The video section also
uses additional levels of write FIFOs, a read cache, page mode DRAM.
4.2.5 Sound Subsystem
The Extensa Series Notebook is equipped with a sound chip set that is Sound
Blaster
TM
and Sound Blaster Pro
compatible. Internal stereo speakers provide the
Notebook with sound generation capabilities. A set of 3.5 mm connectors allow for
Summary of Contents for Extensa 660 Series
Page 1: ...Maintenance Manual ExtensaTM 660 Series Notebook Computers 9813214 0001 Rev A February 1997 ...
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