Design a sequential circuit (Figure 16-27) which adds six

Chapter 16, Problem 16.4

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Design a sequential circuit (Figure 16-27) which adds six to a binary number in the range 0000 through 1001. The input and output should be serial with the least significant bit first. Find a state table with a minimum number of states. Design the circuit using NAND gates, NOR gates, and three D flip-flops. Any solution which is minimal for your state assignment and uses 10 or fewer gates and inverters is acceptable. (Assign 000 to the reset state.)

Test Procedure: First, check out your state table by starting in each state and making sure that the present output and next state are correct for each input. Then, starting in the reset state, determine the output sequence for each of the ten possible input sequences and make a table.

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