JK Flip Flop Circuit Output

digital-logicflipflopmultisim

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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Best Answer

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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