Discussion :: Exam Questions Paper
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Figure shows four D type FFs are connected as a shift register using an XOR gate. The initial state and 3 subsequent states for 3 clock pulses are also given
The state QA QB QC QD after the 4th clock pulse is
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Answer : Option D
Explanation :
After the 3rd pulse FF3 is 0 and FF4 is 1, so that XOR output is 1 which is fed to DA.
So, QA = 1, QA to QB → 0
AB to AC → 0, QC → QD → 0.
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