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Basics of J-K Flipflop when J=K=1 :-

CLK=0 ===> previous values as o/p

CLK=1 ===> toggle the previous values as o/p


∴ Q0N = Q0'          ( CLK )   value changed from 1 --> 0 ( Because -ve edge triggering )


∴ Q1N = Q1'  when ( Q0N and CLK )   value changed from 1 --> 0 ( Because -ve edge triggering )

           = Q1  otherwise

for avoiding confusion, take a temporary clock  as  Q0N and CLK


∴ Q2N = Q2'  when ( Q0N and Q1N and CLK ) value changed from 1 --> 0 ( Because -ve edge triggering )

           = Q2  otherwise

for avoiding confusion, take another temporary clock  as  Q0N and Q1N and CLK


By the above information

 Q0     Q1     Q2

-----------------------

0        0        0

1        0        0   ( after applying 1st clock pulse )

0        1        0   ( after applying 2nd clock pulse )

1        1        0   ( after applying 3rd clock pulse )

0        0        1   ( after applying 4th clock pulse )

1        0        1   ( after applying 5th clock pulse )

 

After 5 clk pulses, 101 (Q0,Q1,Q2) and Y=0 (Q0⊕Q1⊕Q2)

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