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VHDL for Engineers - Kenneth L. Short.pdf
VHDL can also be used as a general purpose parallel programming language. S Department of Defense in order to document the behavior of the ASICs that supplier companies were including in equipment. The idea of being able to simulate the ASICs from the information in this documentation was so obviously attractive that logic simulators were developed that could read the VHDL files. The next step was the development of logic synthesis tools that read the VHDL, and output a definition of the physical implementation of the circuit. Due to the Department of Defense requiring as much of the syntax as possible to be based on Ada, in order to avoid re-inventing concepts that had already been thoroughly tested in the development of Ada, [ citation needed ] VHDL borrows heavily from the Ada programming language in both concepts and syntax. A problem not solved by this edition, however, was "multi-valued logic", where a signal's drive strength none, weak or strong and unknown values are also considered. The updated IEEE , in , made the syntax more consistent, allowed more flexibility in naming, extended the character type to allow ISO printable characters, added the xnor operator, etc.
VHDL Computer hardware description language 2. Programmable logic devices. Digital electronics. S Photograph courtesy of Patricia L. Used by permission.
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It teaches VHDL using selected sample problems, which are solved step by step and with precise explanations, so that readers get a clear idea of what a good VHDL code should look like. The book is divided into eight chapters, covering aspects ranging from the very basics of VHDL syntax and the module concept, to VHDL logic circuit implementations. In the first chapter, the entity and architecture parts of a VHDL program are explained in detail. The second chapter explains the implementations of combinational logic circuits in VHDL language, while the following chapters offer information on the simulation of VHDL programs and demonstrate how to define data types other than the standard ones available in VHDL libraries. In turn, the fifth chapter explains the implementation of clocked sequential logic circuits, and the sixth shows the implementation of registers and counter packages. The book offers extensive exercises at the end of each chapter, inviting readers to learn VHDL by doing it and writing good code.