GATE | GATE CS 2010 | Question 65

In the sequential circuit shown below,if the initial value of the output Q1Q0 is 00,what are the next four values of Q1Q0? 

(A)

11, 10, 01, 00

(B)

10, 11, 01, 00

(C)

10, 00, 01, 11

(D)

11, 10, 00, 01

Answer: (A)

Explanation:

We have t flip flop Truth table of t flip flop  

t	q
0	q
1	q’

So q0 always inverted as t=1 always So 1)q10=1 2)q0 =0 3)q0 =1 4)q0 =1 For q1 also t=1 always but clock is so we have to observe positive edge of clock I.e. when is q0 going from 0 -> 1 1)q1 =1 2)q1 =1 3)q1 =0 4)q1 =0 So final combination q0q1->(11,10,01,00) Ans (A)

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