However, asynchronous logic is more difficult to design and is subject to problems not encountered in synchronous designs. The main problem is that digital memory elements are sensitive to the order that their input signals arrive; if two signals arrive at a flip-flop or latch at almost the same time, which state the circuit goes into can depend on which signal gets to the gate first. Therefore, the circuit can go into the wrong state, depending on small differences in the propagation delays of the logic gates.
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This is called a race condition. This problem is not as severe in synchronous circuits because the outputs of the memory elements only change at each clock pulse.
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The interval between clock signals is designed to be long enough to allow the outputs of the memory elements to "settle" so they are not changing when the next clock comes. Therefore, the only timing problems are due to "asynchronous inputs"; inputs to the circuit from other systems which are not synchronized to the clock signal.
Asynchronous sequential circuits are typically used only in a few critical parts of otherwise synchronous systems where speed is at a premium, such as parts of microprocessors and digital signal processing circuits.
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The design of asynchronous logic uses different mathematical models and techniques from synchronous logic, and is an active area of research. From Wikipedia, the free encyclopedia. For the synthesizer company, see Sequential Circuits. Main article: asynchronous circuit.
Michael VLSI Design. CRC Press. Sequential Logic: Analysis and Synthesis. John Wiley and Sons. Palnitkar offers a wealth of proven Verilog HDL modeling tips, and more than fully-updated illustrations, examples, and exercises. Each chapter contains detailed learning objectives and convenient summaries. This is one of the best Verilog HDL books, with this book, you can: 1.
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It includes explanations of all the new features introduced in this version of the language, with examples. This book teaches the basic concepts of digital design in a clear, accessible manner. The book presents the basic tools for the design of digital circuits and provides procedures suitable for a variety of digital applications. The text presents the basic tools for the design of digital circuits and provides procedures suitable for a variety of digital applications. This Digital Design book supports a multimodal approach to learning, with a focus on digital design, regardless of language.
The Verilog Hardware Description Language, 5th Edition, is a valuable resource for engineers and students interested in describing, simulating, and synthesizing digital systems; the extensive number of simulatable examples and wide range of representation styles covered ensure its quick use in design.
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Sequential Logic and Verilog HDL Fundamentals discusses the analysis and synthesis of synchronous and asynchronous sequential machines. The book concentrates on sequential logic design with a focus on the design of various Verilog HDL projects. Emphasis is placed on structured and rigorous design principles that can be applied to practical applications. Each step of the analysis and synthesis procedures is clearly delineated.