Verifiable RTL 设计原则（第2版）：实现可验证的功能编码风格

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"Principles of Verifiable RTL Design (2nd Ed.) 是一本由Kluwer出版的书籍，主要关注Verilog语言中的可验证寄存器传输级（RTL）设计方法，作者是Lionel Benning和Harry Foster，来自Hewlett-Packard Company。本书强调了一种支持验证过程的功能编码风格，旨在帮助IC设计工程师更好地理解和实践可验证的RTL设计。" 《可验证RTL设计原理（第2版）》深入探讨了在集成电路（IC）设计中，如何通过采用特定的编码风格来增强RTL代码的验证效率和可靠性。书中内容涵盖了Verilog语言的应用，特别是在确保设计正确性方面的重要原则和技巧。书中的主要内容可能包括： 1. **寄存器传输级（RTL）设计**：RTL是数字电路设计的关键阶段，它描述了数据在系统中如何流动和处理。书中可能会详细解释如何编写可读、可维护且易于验证的RTL代码。 2. **功能性编码风格**：书中提到的“支持验证过程的功能编码风格”可能涉及编写能够暴露潜在错误和简化验证逻辑的代码规范。 3. **验证过程**：可能会详细介绍如何利用Verilog的特性进行系统级验证，包括边界扫描、状态机建模、随机化测试向量生成和形式验证等方法。 4. **案例研究与实践**：书中可能包含实际的设计示例，用于演示如何应用这些原则来解决复杂的设计问题和验证挑战。 5. **工具和技术**：可能涵盖现代验证工具的使用，如仿真器、综合器、形式验证工具，以及如何结合使用这些工具来提高设计质量。 6. **调试与修复**：讨论如何发现和修复RTL设计中的错误，以及如何建立有效的调试策略。 7. **设计重用和IP核**：可能涉及如何确保重用的IP核符合验证标准，以保证整个系统的可靠性。 8. **预序和前言**：作者可能会在前言中阐述编写本书的动机和目标，以及对读者群体的定位，预序可能由行业专家提供，对书中的贡献和价值进行评述。通过阅读这本书，IC设计工程师和验证工程师可以提升其在Verilog RTL设计和验证方面的专业技能，确保设计的高质量和可验证性，从而减少设计周期中的错误和返工。书中提供的实用指导将对提升整体设计流程的效率和可靠性起到关键作用。

FOREWORD

System designers, computer scientists and engineers have con-

tinuously invented and employed notations for modeling, specify-

ing, simulating, documenting, communicating, teaching, verifying

and controlling the designs of digital systems. Initially these sys-

tems were represented via electronic and fabrication details. Fol-

lowing C. E. Shannon’s revelation of 1948, logic diagrams and

Boolean equations were used to represent digital systems in a fash-

ion that de-emphasized electronic and fabrication detail while

revealing logical behavior. A small number of circuits were made

available to remove the abstraction of these representations when it

was desirable to do so. As system complexity grew, block diagrams,

timing charts, sequence charts, and other graphic and symbolic

notations were found to be useful in summarizing the gross features

of a system and describing how it operated. In addition, it always

seemed necessary or appropriate to augment these documents with

lengthy verbal descriptions in a natural language.

While each notation was, and still is, a perfectly valid means of

expressing a design, lack of standardization, conciseness, and for-

mal definitions interfered with communication and the understand-

ing between groups of people using different notations. This

problem was recognized early and formal languages began to

evolve in the 1950s when I. S. Reed discovered that flip-flop input

equations were equivalent to a register transfer equation, and that

xvi

tor-like notation. Expanding these concepts Reed developed a nota-

tion that became known as a Register Transfer Language (RTL).

While the notation had only a few features that are associated with

RTLs today, its development started an evolutionary process that is

still underway. RTLs such as Verilog improve the ability of the

designer to communicate the design intent as well as providing a

mechanism to verify correctness.

In the late 1980s, progress in RTL synthesis provided productiv-

ity gains by translating the designer’s intent into gates and silicon.

Success with RTL synthesis resulted in the acceptance of an RTL

synthesizable subset. In other words, by constraining a rich RTL to

a subset of keywords and an explicit coding style, synthesis can use

precise semantics to provide an efficient and clear mapping to a

specific hardware implementation.

Unfortunately, the synthesis productivity gain has resulted in an

increase in verification complexity. In this book, the focus is on ver-

ification productivity gains. This seems to be a normal progression

to emphasize synthesis productivity gains when synthesis was in

the critical path, and then turn to verification productivity gains

when it became the biggest problem for the design team. This book

promotes a strong coupling between the RTL specification and the

verification process. The authors have placed emphasis on describ-

ing verification processes and explicitly how

they relate to RTL

coding style. Many other Verilog books describe details for the

entire language without considering the coding impact related to

the verification process.

By constraining a rich hardware description language to an RTL

verifiable subset, emerging verification technologies can easily be

integrated into the design flow (e.g., model checking, equivalence

checking, cycle-based simulation and fast two-state simulation).

The RTL verifiable subset in this book is actually a smaller synthe-

sizable subset, which includes the keywords supporting higher lev-

els of modeling and abstraction. Some Hewlett-Packard engineers

outside the authors’ team have found the ideas too revolutionary,

and out-of-line with the way that they learned to use Verilog for

simulation and synthesis. However, the authors’ team has success-

fully developed very large complex systems in Hewlett-Packard fol-

lowing the guidelines and methodologies discussed in this book.

Furthermore, the authors’ team has successfully integrated emerg-

ing verification technologies into their design flow, while other

design teams are struggling and fighting the verification tools and

processes.

I find this book to be a significant contribution in helping other

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