Step-by-Step Solution
Refer to the sequential circuit in Figure P5.8 in the textbook.
Draw the circuit for a 
flip-flop.
If the 
input is high, then the 
flip-flop changes its state (“toggles”) whenever the clock input is strobed. If the 
input is low, the flip-flop holds the previous state.
flipflop operation is illustrated as follows:
Write the characteristic equation.
From the Figure P5.8 in the textbook, write the Boolean expressions for 
and 
.
Use flip flop input equations, Construct the excitation table for the circuit.
Recall the Table 2 by ignoring the flip flop inputs.
Draw the state diagram by observing present state and next state in table 2.
Thus, state table and state diagram has been implemented for the sequential circuit.
From Table 2, it is seen that the counter counts 
and 
. Therefore, the circuit acts as a mod 2 counter.
Here, the state 11 is unused state. If the circuit enters the unused state, the circuit gets reset that is 
.
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