Ch2Problems2

Ch2Problems2 - Sequential Circuits Problems(I) Prof....

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Unformatted text preview: Sequential Circuits Problems(I) Prof. Sin-Min Lee Department of Mathematics and Computer Science Algorithm = Logic + Control We wish to design a synchronous sequential circuit whose state diagram is shown in Figure. The type of flip-flop to be use is J-K Two flip-flops are needed to represent the four states and are designated Q0Q1. The input variable is labelled x. . Excitation table for JK flip-flop Excitation table of the circuit The simplified Boolean functions for the combinational circuit can now be derived How do we determine the combinatorial ciccuit? This circuit has three inputs, I, R, and the current A. It has one output, DA, which is the desired next A. So we draw a truth table, as before. For convenience I added the label Next A to the DA column But this table is simply the truth table for the combinatorial circuit. A divide-by-three counter which outputs one 1 for every 3 1's seen as input (not necessarily in succession.) After outputting a 1, it starts counting all over again. 1....
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Ch2Problems2 - Sequential Circuits Problems(I) Prof....

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