1
Question
Assuming that all flip-flops are in reset conditions initially, the count sequence observed at QA in the circuit shown is
Assuming that all flip-flops are in reset conditions initially, the count sequence observed at QA in the circuit shown is
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Solution
The correct option is A 0110100..
Initially,
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
QA = QB = QC = 0
DA = QB ⊙ QC = 1, DB = QA = 0
DC = QB = 0
After one clock pulse,
QA = 1, QB = 0, QC = 0
DA = QB ⊙ QC = 1
DB = QA = 1, DC = QB = 0
After two clock pulse,
QA = 1, QB = 1, QC = 0
DA = QB ⊙ QC = 0
DB = QA = 1, DC = QB = 1
After three clock pulse,
QA = 0, QB = 1, QC = 1
DA = QB ⊙ QC = 1
DB = QA = 0, DC = QB = 1
After four clock pulse,
QA = 1, QB = 0, QC = 1
DA = QB ⊙ QC = 0
DB = QA = 1, DC = QB = 0
After five clock pulse,
QA = 0, QB = 1, QC = 0
DA = QB ⊙ QC = 0
DB = QA = 0, DC = QB = 1
After six clock pulse,
QA = 0, QB = 0, QC = 1
Therefore, the count sequence observed at QA is 0110100....
Initially, <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> QA = QB = QC = 0
DA = QB ⊙ QC = 1, DB = QA = 0
DC = QB = 0
After one clock pulse,
QA = 1, QB = 0, QC = 0
DA = QB ⊙ QC = 1
DB = QA = 1, DC = QB = 0
After two clock pulse,
QA = 1, QB = 1, QC = 0
DA = QB ⊙ QC = 0
DB = QA = 1, DC = QB = 1
After three clock pulse,
QA = 0, QB = 1, QC = 1
DA = QB ⊙ QC = 1
DB = QA = 0, DC = QB = 1
After four clock pulse,
QA = 1, QB = 0, QC = 1
DA = QB ⊙ QC = 0
DB = QA = 1, DC = QB = 0
After five clock pulse,
QA = 0, QB = 1, QC = 0
DA = QB ⊙ QC = 0
DB = QA = 0, DC = QB = 1
After six clock pulse,
QA = 0, QB = 0, QC = 1
Therefore, the count sequence observed at QA is 0110100....
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