Verilog硬件描述语言教程

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"The Verilog Hardware Description Language, Fifth Edition 是一本深入学习Verilog语言的英文书籍，由Donald E. Thomas和Philip R. Moorby合著。本书由Kluwer Academic Publishers出版，电子书 ISBN 为0-306-47666-5，印刷版 ISBN 为1-4020-7089-6。Verilog是Cadence Design Systems, Inc.的注册商标。" Verilog是一种广泛使用的硬件描述语言（HDL），用于设计和验证数字系统的逻辑。它允许工程师以一种结构化的方式描述硬件电路的行为和结构，这些描述可以被编译并仿真，以验证设计是否符合预期。这本书的第五版是进阶学习Verilog的宝贵资源，适合已经具备一定基础的读者。在"Getting Started"部分，作者通常会引导读者了解Verilog的基础知识，包括如何设置开发环境、编写基本的代码结构以及如何进行首次仿真。这部分可能会介绍如何定义模块（modules）、输入和输出端口（input and output ports）、以及基本的数据类型如 wire 和 reg。 "A Structural Description"章节则深入到Verilog的结构化描述，讲解如何使用各种逻辑门（gates）和组合逻辑电路（combinational logic circuits）来构建更复杂的模块。这可能包括AND、OR、NOT等门级逻辑，以及用case语句和函数来描述多输入逻辑功能。书中还可能涉及时序逻辑（sequential logic），包括寄存器（registers）和时钟（clocks）的概念，以及如何用always块来描述状态机和存储元素的行为。此外，高级特性如接口（interfaces）、参数化（parametrization）和综合（synthesis）也可能被涵盖，这些都是现代数字系统设计的关键元素。模拟（simulation）是验证Verilog设计的重要步骤，书中会详细解释如何使用不同的测试向量（test vectors）来检查设计的功能正确性。这可能包括边界情况（boundary conditions）的处理和错误检测机制。最后，附录和参考文献提供了额外的学习资源和对Verilog标准的详细引用，帮助读者更全面地理解和应用Verilog语言。这本书对于希望在数字系统设计、FPGA开发或者SoC验证等领域深化Verilog技能的工程师来说是一本必备读物。通过阅读和实践书中的例子，读者能够提升自己在硬件描述语言方面的专业知识，进而设计出更加高效和可靠的数字系统。

Preface

The Verilog language is a hardware description language that provides a means of

specifying a digital system at a wide range of levels of abstraction. The language sup-

ports the early conceptual stages of design with its behavioral level of abstraction, and

the later implementation stages with its structural abstractions. The language includes

hierarchical constructs, allowing the designer to control a description’s complexity.

Verilog was originally designed in the winter of 1983/84 as a proprietary verifica-

tion/simulation product. Later, several other proprietary analysis tools were developed

around the language, including a fault simulator and a timing analyzer. More recently,

Verilog has also provided the input specification for logic and behavioral synthesis

tools. The Verilog language has been instrumental in providing consistency across

these tools. The language was originally standardized as IEEE standard #1364-1995.

It has recently been revised and standardized as IEEE standard #1364-2001. This

book presents this latest revision of the language, providing material for the beginning

student and advanced user of the language.

It is sometimes difficult to separate the language from the simulator tool because

the dynamic aspects of the language are defined by the way the simulator works. Fur-

ther, it is difficult to separate it from a synthesis tool because the semantics of the lan-

guage become limited by what a synthesis tool allows in its input specification and

produces as an implementation. Where possible, we have stayed away from simulator-

and synthesis-specific details and concentrated on design specification. But, we have

included enough information to be able to write working executable models.

xvi

The Verilog Hardware Description Language

The book takes a tutorial approach to presenting the language. Indeed, we start

with a tutorial introduction that presents, via examples, the major features of the lan-

guage and the prevalent styles of describing systems. We follow this with a detailed

presentation on using the language for synthesizing combinational and sequential sys-

tems. We then continue with a more complete discussion of the language constructs.

Our approach is to provide a means of learning by observing the examples and

doing exercises. Numerous examples are provided to allow the reader to learn (and re-

learn!) easily by example. It is strongly recommended that you try the exercises as

early as possible with the aid of a Verilog simulator. The examples shown in the book

are available in electronic form on the enclosed CD. Also included on the CD is a

simulator. The simulator is limited in the size of description it will handle.

The majority of the book assumes a knowledge of introductory logic design and

software programming. As such, the book is of use to practicing integrated circuit

design engineers, and undergraduate and graduate electrical or computer engineering

students. The tutorial introduction is organized in a manner appropriate for use with

a course in introductory logic design. A separate appendix, keyed into the tutorial

introduction, provides solved exercises that discuss common errors. The book has also

been used for courses in introductory and upper level logic and integrated circuit

design, computer architecture, and computer-aided design (CAD). It provides com-

plete coverage of the language for design courses, and how a simulator works for

CAD courses. For those familiar with the language, we provide a preface that covers

most of the new additions to the 2001 language standard.

The book is organized into eleven chapters and eight appendices. The first part of

the book contains a tutorial introduction to the language which is followed by a chap-

ter on its use for logic synthesis. The second part of the book, Chapters 3 through 6,

provide a more rigorous presentation of the language’s behavioral, hierarchical, and

logic level modeling constructs. The third part of the book, Chapters 7 through 11,

covers the more specialized topics of cycle-accurate modeling, timing and event

driven simulation, user-defined primitives, and switch level modeling. Chapter 11

suggests two major Verilog projects for use in a university course. One appendix pro-

vides tutorial discussion for beginning students. The others are reserved for the dryer

topics typically found in a language manual; read those at your own risk.

Have fun designing great systems…

always,

Donald E. Thomas

Philip R. Moorby

March 2002

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