CHAPTER

1

Basic Concepts

This chapter answers the question,“What are abstract data

types?”The idea of using well-designed abstract data types

(ADTs) to simplify the development life cycle and to create

reusable code is well established. This chapter covers the ba-

sics of designing and implementing ADTs in an object-ori-

ented programming language. As a foundation to exploring

data abstraction, we will take a look inside Java and ex-

plore some of the internal workings of the Java runtime sys-

tem. Java reference objectswill be explained. The passing

of reference and value types as arguments and how each

type of argument passing is used in the Java programming

language will be discussed. Near the end of this chapter, ex-

ercises are provided to stimulate understanding in the use

of reference objects.

1

CHAPTER

(^1313)

CPU: Synthesis

Description

In this chapter, we further refine the CPU description and

examine the RTL (Register Transfer Level) description of

the CPU. The CPU is described by a number of lower-level

components that are instantiated to form the CPU design.

At the top of the CPU design is an architecture that

instantiates all of the lower-level components to form

the CPU. The CPU block diagram is shown in Figure 13-1.