[21 [60 points] Design a clocked synchronous counter using Enabled D Flip-Flops with output sequence: I, 3, 5, 7, 9, 11, 13, 15, 14, 12, 10, 8, 6, 4, 2, 0, 1, Show the characteristic and excitation equations of the Flip-Flops, as well as the state-transition table and the logic diagram of the counter.
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