A switch-tail counter (also called twisted ring counter, Johnson counter) uses the complement of the serial output of a right shift register as its serial input.
(a) Starting from an initial state of 000, list the sequence of states after each shift until the register returns to 000.
(b) Beginning in state 00...0, how many states are there in the count sequence of an n-bit switch-tail counter?
(c) Design a decoder lo be driven by the counter that produces a one-hot code output for each of the states. Make use of the don’t-care states in your design.
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