1. Referring to the following hardware DFA, write the next state number in the blank provided for each combination of current state and condition.

                 In state...     on condition...          go to state...
               
                      2               a                   _____________
               
                      2               c                   _____________
               
                      3               d                   _____________
               
                      0               a                   _____________
               
                      1               c                   _____________
               
                      1               b                   _____________

  In state...     on condition...          go to state...
       2               a                   _____0_______
       2               c                   _____3_______
       3               d                   _____3_______
       0               a                   _____1_______
       1               c                   _____3_______
       1               b                   _____2_______

2. If there were 20 different states, how many flip-flops would you need for the DFA state register?

3. Show the AND gate that controls the S₁ control wire. Which instructions set the S₁ wire? (S₁ is one of the inputs to the shifter.)

answer...

4. Since the IR register is only changed at one point during the instruction cycle, what STATE wire would control IR-LD? (Refer to Fig. 7.7.2)

5. Which instructions cause the DFA to move directly from state 2 to state 4, bypassing state 3 entirely? (Refer to Fig. 7.7.2)