In a parallel in/parallel out shift register, D0 = 1, D1 = 1, D2 = 1, and D3 = 0. After three clock pulses, the data outputs are ________
Question
In a parallel in/parallel out shift register,
D0 = 1,
D1 = 1,
D2 = 1,
D3 = 0.
After three clock pulses, the data outputs are ________
Solution
In a parallel in/parallel out shift register, the data is shifted on each clock pulse. Given that D0 = 1, D1 = 1, D2 = 1, and D3 = 0, after three clock pulses, the data outputs would be as follows:
1st clock pulse: D3 takes the value of D2, D2 takes the value of D1, D1 takes the value of D0, and D0 is unknown as it depends on the new input. So, the outputs are D0 = X, D1 = 1, D2 = 1, D3 = 1.
2nd clock pulse: D3 takes the value of D2, D2 takes the value of D1, D1 takes the value of D0, and D0 is again unknown. So, the outputs are D0 = X, D1 = X, D2 = 1, D3 = 1.
3rd clock pulse: D3 takes the value of D2, D2 takes the value of D1, D1 takes the value of D0, and D0 is again unknown. So, the outputs are D0 = X, D1 = X, D2 = X, D3 = 1.
So, after three clock pulses, the data outputs are D0 = X, D1 = X, D2 = X, D3 = 1.
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