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A serial in/parallel out, 4-bit shift register initially contains all 1s. The data nibble 0111 is waiting to enter. After four clock pulses, the register contains ________
- a)0000
- b)1111
- c)0111
- d)1000
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A serial in/parallel out, 4-bit shift register initially contains all ...
Solution:
Shift registers are digital circuits that are used for the storage and movement of data. They are constructed using flip-flops and are capable of shifting data either to the left or to the right.
Serial in/parallel out shift register:
A serial in/parallel out shift register is one in which data is inputted serially, one bit at a time, and outputted in parallel, all at once.
Given:
The shift register is a 4-bit serial in/parallel out shift register that is initially loaded with all 1s. The data nibble 0111 is waiting to enter.
We need to determine the contents of the shift register after four clock pulses.
Working:
Initially, the shift register contains all 1s:
Q3 Q2 Q1 Q0
1 1 1 1
The data nibble 0111 is waiting to enter:
Data: 0 1 1 1
After the first clock pulse, the data bit 0 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 1 1 1
↓
1 1 1 0
After the second clock pulse, the data bit 1 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 1 1 0
↓
1 1 0 1
After the third clock pulse, the data bit 1 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 1 0 1
↓
1 0 1 1
After the fourth clock pulse, the data bit 1 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 0 1 1
↓
0 1 1 1
Therefore, the contents of the shift register after four clock pulses are 0111, which is the data nibble that was waiting to enter.
Hence, the correct answer is option (c) 0111.
Shift registers are digital circuits that are used for the storage and movement of data. They are constructed using flip-flops and are capable of shifting data either to the left or to the right.
Serial in/parallel out shift register:
A serial in/parallel out shift register is one in which data is inputted serially, one bit at a time, and outputted in parallel, all at once.
Given:
The shift register is a 4-bit serial in/parallel out shift register that is initially loaded with all 1s. The data nibble 0111 is waiting to enter.
We need to determine the contents of the shift register after four clock pulses.
Working:
Initially, the shift register contains all 1s:
Q3 Q2 Q1 Q0
1 1 1 1
The data nibble 0111 is waiting to enter:
Data: 0 1 1 1
After the first clock pulse, the data bit 0 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 1 1 1
↓
1 1 1 0
After the second clock pulse, the data bit 1 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 1 1 0
↓
1 1 0 1
After the third clock pulse, the data bit 1 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 1 0 1
↓
1 0 1 1
After the fourth clock pulse, the data bit 1 enters the shift register and the existing bits shift to the left by one position:
Q3 Q2 Q1 Q0
1 0 1 1
↓
0 1 1 1
Therefore, the contents of the shift register after four clock pulses are 0111, which is the data nibble that was waiting to enter.
Hence, the correct answer is option (c) 0111.
Community Answer
A serial in/parallel out, 4-bit shift register initially contains all ...
In Serial-In/Parallel-Out shift register, data will be shifted all at a time with every clock pulse. Therefore,
Wait | Store
0111 | 0000
011 | 1000 1st clk
01 | 1100 2nd clk
0 | 1110 3rd clk
X | 1111 4th clk.
Wait | Store
0111 | 0000
011 | 1000 1st clk
01 | 1100 2nd clk
0 | 1110 3rd clk
X | 1111 4th clk.
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A serial in/parallel out, 4-bit shift register initially contains all 1s. The data nibble 0111 is waiting to enter. After four clock pulses, the register contains ________a)0000b)1111c)0111d)1000Correct answer is option 'C'. Can you explain this answer?
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