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I have a group project that requires us to use three flip flops with the following requirements. If x = 0 and y = 0, the counter remains the same.

If x = 0 and y = 1, the circuit through the state transition from 000, 001,...,111, back to 000 and repeats.

If x = 1 and y = 0, state transitions from 111, 110, ..., 000 back to 111, and repeats.

If x = 1 and y = 1, the counter resets to 000.

I have created the state table to determine the functin of the circuit and constructed the circuit in Multisim. I've tried connecting the lcd display to the Q outputs of the JK's, but my output does not make any sense. It does not count through the cycles.

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    \$\begingroup\$ "It does not count through the cycles". What does it do? Is the output always the same? \$\endgroup\$
    – nidhin
    Apr 29, 2015 at 4:23
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    \$\begingroup\$ You need to tell us how it is not behaving properly. What's not working? What outputs are you actually getting? This is easily as important as explaining what you WANT it to do. \$\endgroup\$
    – Dwayne Reid
    Apr 29, 2015 at 5:01

1 Answer 1

Reset to default
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The JK latches must set have SET and RESET connected. Do not leave disconnected ( hanging in the air ). When x=1 and y=1, RESET'S connected to "1" (5v). When x<>1 or y<>1, RESET'S and STE'S to "0" (ground) SET and RESET are active "1"

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