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Overview[ edit ] Hardware description languages such as Verilog are similar to software programming languages because they include ways of describing the propagation time and signal strengths sensitivity. The non-blocking assignment allows designers to describe a state-machine update without needing to declare and use temporary storage variables.
Since these concepts are part of Verilog's language semantics, designers could quickly write descriptions of large circuits in a relatively compact and concise form. At the time of Verilog's introduction , Verilog represented a tremendous productivity improvement for circuit designers who were already using graphical schematic capture software and specially written software programs to document and simulate electronic circuits.
The designers of Verilog wanted a language with syntax similar to the C programming language , which was already widely used in engineering software development.
Verilog requires that variables be given a definite size. In C these sizes are assumed from the 'type' of the variable for instance an integer type may be 8 bits. A Verilog design consists of a hierarchy of modules.
Modules encapsulate design hierarchy, and communicate with other modules through a set of declared input, output, and bidirectional ports. However, the blocks themselves are executed concurrently, making Verilog a dataflow language. Verilog's concept of 'wire' consists of both signal values 4-state: "1, 0, floating, undefined" and signal strengths strong, weak, etc. This system allows abstract modeling of shared signal lines, where multiple sources drive a common net.
When a wire has multiple drivers, the wire's readable value is resolved by a function of the source drivers and their strengths. A subset of statements in the Verilog language are synthesizable. Verilog modules that conform to a synthesizable coding style, known as RTL register-transfer level , can be physically realized by synthesis software.
Synthesis software algorithmically transforms the abstract Verilog source into a netlist , a logically equivalent description consisting only of elementary logic primitives AND, OR, NOT, flip-flops, etc. Further manipulations to the netlist ultimately lead to a circuit fabrication blueprint such as a photo mask set for an ASIC or a bitstream file for an FPGA. Beginning[ edit ] Verilog was one of the first popular[ clarification needed ] hardware description languages to be invented.
Su, for his PhD work. Cadence now has full proprietary rights to Gateway's Verilog and the Verilog-XL, the HDL-simulator that would become the de facto standard of Verilog logic simulators for the next decade.
Originally, Verilog was only intended to describe and allow simulation, the automated synthesis of subsets of the language to physically realizable structures gates etc. Verilog is a portmanteau of the words "verification" and "logic". In the same time frame Cadence initiated the creation of Verilog-A to put standards support behind its analog simulator Spectre.
Verilog [ edit ] Extensions to Verilog were submitted back to IEEE to cover the deficiencies that users had found in the original Verilog standard. Verilog is a significant upgrade from Verilog First, it adds explicit support for 2's complement signed nets and variables.
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Previously, code authors had to perform signed operations using awkward bit-level manipulations for example, the carry-out bit of a simple 8-bit addition required an explicit description of the Boolean algebra to determine its correct value.
Extensive test code is included for each function, to assist you with your own verification efforts. Although Verilog Designer's Library assumes a basic familiarity with Verilog structure and syntax, it does not require a background in programming. Beginners can work through the book in sequence to develop their skills, while experienced Verilog users can go directly to the routines they need.
Hardware designers, systems analysts, VARs, OEMs, software developers, and system integrators will find it an ideal sourcebook on all aspects of Verilog development. Their ability to model and simulate all levels of design, from abstract algorithms and behavioral functions to register transfer level RTL and gate level descriptions, make them extremely powerful tools.
Synthesis software allows engineers to take these very high-level descriptions of chips and systems and automatically convert them to real netlists for manufacturing, at least in theory. As chip complexity increases, and gate counts commonly reach , and above, HDLs become the only practical design method.
The benefits of HDLs are even trickling into the areas of PCB design, where it is useful to have one set of tools for simulating integrated circuits and PCBs and the systems into which they are incorporated. The value of using HDLs to model a system on a behavioral level also cannot be ignored as system architects use them to determine and eliminate bottlenecks and improve overall performance of a wide variety of systems.
Of the HDLs available, Verilog is one of the most popular. Many designs have been created in Verilog and a large number of Verilog simulators, compilers, synthesizers, and other tools are available from numerous vendors. Its powerful features have led to many applications in all areas of chip design.
This book provides a library of general purpose routines that simplify the task of Verilog programming and enhance existing designs. I have taken input from other designer engineers to make sure that this library covers many of the common functions that a hardware designer is likely to need. Beginning Verilog designers can use these routines as tutorials in order to learn the language or to increase their understanding of it.
Experienced Verilog designers can use these routines as a reference and a starting point for real world designs.
Rather than redevelop code for common functions, you can simply cut and paste these routines and modify them for your own particular needs. Each routine includes a brief but complete description plus fully documented Verilog code for Behavioral and Register Transfer Level RTL implementations.
In addition, the Verilog simulation code that was used to verify each hardware module is also included. This code is also available on the enclosed diskette.
Feel free to include the Verilog code, royalty-free, in your own designs. The routines are organized according to functionality.
Each chapter addresses a common type of function such as state machines, memory models, or data flow. Each section of a chapter gives an example of code to implement that particular function. Also, successive sections, in general, have increasingly more complex examples. Each function is described using a behavioral model followed by an RTL model. Because behavioral models do not include low level implementation details, they simulate very fast and can be used for quickly evaluating a proposed architecture for a chip or a system.
The behavioral models are also useful for creating a simulation environment for your design. The inputs to a chip can be stimulated using behavioral models that might represent something simple, like DRAMs connected to a microprocessor, or something complex like workstations connected to a network. The RTL code, on the other hand, is needed to create real hardware. It is written with synthesis in mind. Despite the sophistication of many synthesis tools, these programs need to make decisions about the gate level implementation based on the RTL code.
For this reason, the RTL descriptions must be written in such a way so that there is no ambiguity with respect to what the designer has in mind. Also, the Verilog simulation code is given that is used to test the functionality of each module.
This is important because good simulation code will determine whether the hardware will work correctly.
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The organization of the book has another advantage. If you are a novice Verilog designer, you can start by studying the simple examples in the beginning and work your way up to the complex examples toward the end. This will give you a very comprehensive understanding of Verilog. If you are an experienced Verilog designer, you can simply jump right to the section that most closely matches your particular design needs. Take that function, play with it, and modify it to suit your design.
Digital Integrated Circuit Design Using Verilog and Systemverilog
This will save a significant amount of time by eliminating the need to write the code from scratch. This book is for Verilog users at any level. It assumes a basic familiarity with Verilog structure and syntax.
It does not assume any programming background. The book will also appeal to experienced Verilog designers who can skip to the sections that fit their own needs.
This book is valuable to hardware designers, systems analysts, students, teachers, trainers, vendors, system integrators, VARs, OEMs, software developers. It is an ideal follow-on or sourcebook for those who have just completed an introductory book or course on Verilog programming. TXT file on the accompanying diskette. The publisher and I welcome your comments regarding the routines in the book. If you find bugs, discover better ways to accomplish tasks, or can suggest other routines that you think should be included, I am eager to hear about them.
To receive notification of revisions and upgrades to the Library, please mail the registration form that appears later in this book. Bob Zeidman Cupertino, California. Ready-to-use building blocks for integrated circuit design. There are plenty of introductory texts to describe the basics of Verilog, but "Verilog Designer's Library" is the only book that offers real, reusable routines that you can put to work right away.
Coverage includes: Essential Verilog coding techniques Basic building blocks of successful routines State machines and memories Practical debugging guidelines Although "Verilog Designer's Library" assumes a basic familiarity with Verilog structure and syntax, it does not require a background in programming. Implementation Code. Appendix A: Resources.
He has written technical papers on hardware and software design methods, and has taught courses on Verilog, ASIC design, and FPGA design at conferences throughout the world. Backcover copy Ready-to-use building blocks for integrated circuit design. Why start coding from scratch when you can work from this library of pre-tested routines, created by an HDL expert?
There are plenty of introductory texts to describe the basics of Verilog, but Verilog Designer's Library is the only book that offers real, reusable routines that you can put to work right away.Consequently, much of the language can not be used to describe hardware. Take that function, play with it, and modify it to suit your design.
Each function is described by a behavioral model to use for simulation, followed by the RTL code you'll use to synthesize the gate-level implementation. It clearly explains what is useful for circuit design and what parts of the languages are only software, providing a non-theoretical, practical guide to robust, reliable and optimized hardware design and development. Sign in Sign in Remember me Forgot username or password?
This item: In addition, the Verilog simulation code that was used to verify each hardware module is also included.