Suppose a circuit is constructed from three D-type flip-flops, one input I, with
a. Draw the circuit diagram.
b. Assume the circuit starts with all flip-flops set. Sketch a table that shows the outputs of all three flip-flops.
Analysis:
a. To draw the circuit diagram simply draw lines from the outputs Q1 and Q2 to the inputs D0 and D1, respectively. Likewise, create an exclusive OR gate with Q1 and Q2 as its inputs and ? as its output. Then create another exclusive OR gate with ? and I as its inputs. The output of this second exclusive OR gate is the input to D2. The result of this procedure is shown in the figure.
b. A table of the various outputs in response to the input I is shown here. Notice that I acts as an enable input.
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