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Richards controller
The Richards controller is a method of implementing a finite state machine using simple integrated circuits and combinational logic. The method has been named after its inventor, Charles L. Richards. One of the distinct advantages of this method over conventional finite state machine design methods is that it allows for easier design of complex finite state machines than the traditional techniques of state diagrams, state transition tables and Boolean algebra offer. Using Richards technique it becomes relatively easy to implement machines with many hundreds or even thousands of states.
== History ==
The Richards controller was made because of the need for an easier method of designing finite state machines than using the traditional method of state diagrams, state transition tables, and logic minimization. At the time many of the computer based logic minimization tools that we have today did not exist. Hence logic minimization was for the most part limited to the use of Karnaugh Maps and DeMorgan's Law. Because of this Charles L. Richards invented a method of implementing a finite state machine that did not need an explicit state transition table. He published his findings in the February 1973 issue of Electronics. His generalized implementation became popular and by the 1980s was considered a classic design method. While it is unlikely that commercial products found today contain a classic Richards controller, (since there are faster designs now than ones that use loadable counters,) there is a good chance of a modified Richards controller or a design derived from the Richards controller being used.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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