# self doubt

175 views

!

In the box it is DQ0Q1Q2Q3.

option is a) 3  b) 4 c) 6  d) 7

0
c)

1 vote

As per question we have arrangement as shown in fig .

We have arranged the registers are  Q0,Q1,Q2,Q3 input to Q0 is  ((Q2 ex-or Q3) Ex-Or Q0)

as per current values we have Q0,Q1,Q2,Q3 as 1000 now ,

 CLOCK NUMBER Q0 Q1 Q2 Q3 INPUT At D (Q2 exor Q3 exor Q0) its already loaded input 1 0 0 0 1 CLOCK 1 1 1 0 0 1 CLOCK 2 1 1 1 0 0 CLOCK 3 0 1 1 1 0 CLOCK 4 0 0 1 1 0 CLOCK 5 0 0 0 1 1 CLOCK 6 1 0 0 0 DESIRED OUTPUT GOT.

Hence in 6th clock we got output as 1000

0
thanks bro i got it.
1

SHUBHAM SHASTRI

if you are taking order as Q0 Q1 Q2 Q3 you should start with 0001.

0
yes you are correct .. i  went wrong there
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okay :)
This will be the sequence after each clock cycle:

0001(in order Q0, Q1, Q2, Q3)

1000

1100

1110

0111

0011

0001

1000

After 7th clock cycle, we will get 1000.
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Utkarsh bro but the answer is 6th clock pulse..
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how?
0
i dont know that why i post the question here.
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Do you find any mistake in the solution?? If not consider 7 as the answer. their solution might be wrong.
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but brother may be your solution wrong i think i should wait for some better answer then i go to final decesion.
0

@Utkarsh Joshi you are correct but why you are taking given condition as clock 1...

Means your clock 1 is already exsisting pattern , no need to count it .

0
@utkarsh joshi

1000 (Q3, Q2, Q1, Q0) this is given in question

now you have taken initialy

1000 (which is right)

means after doing exor opration of Q3,Q2,Q0 =1 ,you put this value at the the position of Q3 and shifted the remaining bits and you got 1100

but according to figure it should be put at Q0  position
0
I have considered 0001 initially. read carefully.

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