S1 Sequential Circuit Analysis

# S1 Sequential Circuit Analysis - The question: On page 518...

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The question: On page 518 of the text, how did Figure 8.19 go from table (a) to table (b)? ********** This is a very good question, and one that finds us trying to understand the difference between design and analysis. Design is a forward process, and one that involves synthesis. In our sequential design process, we start with a specification. We take the specification and make a model - a state diagram. We turn the state diagram into a state table. We reduce the state table to one having a minimal number of states. (This step, while important, is superficial, as it does not change the nature of the state machine.) We devise a method for making an optimal state assignment. With this assignment made, we encode the state table, form the Karnaugh maps for excitation and obtain the flip-flop excitation equations. At this point, the design is complete. Now consider an analysis process. Analysis is a reverse process - one that has us determining certain things about something that has already been designed. For example, given a set of excitation equations, we can determine the Karnaugh maps from which the

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## S1 Sequential Circuit Analysis - The question: On page 518...

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