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Chapter 2: Custom single-purpose processors - page 3 / 29

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Embedded Systems Design: A Unified Hardware/Software Introduction, (c) 2000 Vahid/Givargis

Introduction

Processor

Digital circuit that performs a computation tasks

Controller and datapath

General-purpose: variety of computation tasks

Single-purpose: one particular computation task

Custom single-purpose: non-standard task

A custom single-purpose processor may be

Fast, small, low power

But, high NRE, longer time-to-market, less flexible

Microcontroller

CCD preprocessor

Pixel coprocessor

A2D

D2A

JPEG codec

DMA controller

Memory controller

ISA bus interface

UART

LCD ctrl

Display ctrl

Multiplier/Accum

Digital camera chip

lens

CCD

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