Question: Design a 4-bit asynchronous up-down counter using D flip-flops. The up or down count is decided by the logic value of a direction input, U

Design a 4-bit asynchronous up-down counter using D flip-flops. The up or down count is decided by the logic value of a direction input, U. If U=1, the counter will count up. If U=0, the counter will count down.

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