The Verilog Hardware Description Language （第五版）

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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 supports 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 verification/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. Further, it is difficult to separate it from a synthesis tool because the semantics of the language become limited by what a synthesis tool allows in its input specification and produces as an implementation. Where possible, we have stayed away from simulatorand synthesis-specific details and concentrated on design specification. But, we have included enough information to be able to write working executable models.

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