EDN Magazine — 05.12.94 Transition maps guide successful asynchronous state-machine design (figure)

FIGURE 7

Fig 7—The timing diagram (a) for a proposed circuit shows that Z follows A and B=1 and remains stable if B=0. Creating a transition map (b) for the circuit starts at an assumed stable state and fills adjacent squares with the desired next-state values while avoiding state collisions (c). The final state map (d) forms the basis of the Karnaugh maps (e), from which you can derive the final circuit (f).

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