How many flip-flops will be required to design a MOD 12 Johnson counter? Tabulate the count sequence and find the Boolean terms of each of the 12 AND gate outputs. Determine the number of unused states.
(a) Write and verify an HDL behavioral description of a four-bit register with parallel load and asynchronous clear.
(b) Write and verify the HDL structural description of the four-bit register with parallel load shown in Fig. 6.2. Use a 2 1 multiplexer for the flip-flop inputs. Include an asynchronous clear input.
(c) Verify both descriptions, using a testbench.
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