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4 theory of operation, Introduction, Notebook functional description – Texas Instruments EXTENSA 570CD User Manual

Page 39: Processor/memory subsystems, 4theory of operation

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4

Theory of Operation

4.1

Introduction

This section describes the notebook theory of operation.

4.2

Notebook Functional Description

Functionally, the notebook computer consists of the following major
subsystems:

Processor and Memory Subsystem

I/O Subsystem

Video Subsystem

Hard Disk Subsystem

Floppy Disk Subsystem

CD-ROM Subsystem

PCMCIA Subsystem

Sound Subsystem

Serial Infrared Subsystem

Power Subsystem

A functional block diagram of the Extensa 57x Series Notebook is shown in
Figure 4-1.

4.2.1

Processor/Memory Subsystems

The Processor function, housed on the Main Board, is implemented with the
Intel

Pentium Processor (P54C/LM). The processor operates in

conjunction with RAM and ROM Memory on the Memory Board and other
control logic on the Main Board to process software instructions (BIOS,
Windows 95, and Applications).

Primary control for the Processor/Memory subsystem is implemented with
the Pentium Chipset (Opti Viper 82C556/82C557).

The memory subsystem, implemented on the Memory Board and optional
Dual Inline Memory Modules, provides 8 MB (expandable to 40 MB) of fast

Theory of Operation 4-1