MadeEasy Workbook: Digital Logic - Flip Flop

Question

 to complete the circuit what is the value of X?? A) Q2' B) Q1 + Q2  C) (Q1 ex-or Q2)'  D) (Q1 ex-or Q2)

Answer 1

Truth Table

Q2	Q1	T2	T1
0	0	1	0
1	0	0	1
1	1	1	0
0	1	0	1

X = T₁  = Q₁ exor Q₂

Comments

i didn't get T2 in second line why T2 is 0. Plz explain??

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T₂ is 0 because value of Q₂ (i.e, 1) does not change on next clock transition. In row 2 and 3, Q₂ has same value 1. All values of T₂ and T₁ are calculated in similar way.

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my doubt is T2= Q1'  so first line  T2 =1 and second line if Q1= 0 so T2 =1 but it is zero so it does not depend on Q1..and i also getting ur point is T2 =0 because i devlop a sequencr string according to move but i think T2  why not depends on Q1'..plz explain????