Verilog -- A Tutorial Introduction
Digital systems are highly complex. At their most detailed level, they may consist of over a million elements, as would be the case if we viewed a system as a collection of logic gates or pass transistors. From a more abstract viewpoint, these elements may be grouped into a handful of functional components such as cache memories, floating point units, signal processors, or real-time controllers. Hardware description languages have evolved to aid in the design of systems with this large number of elements and wide range of electronic and logical abstractions.
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