Discussion
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- Question
Assume a 4-bit Johnson counter is initially cleared. After the first clock pulse the output is 0001. After the next clock pulse the output will be ________.
Options- A. 0011
- B. 0010
- C. 1000
- D. 0110
- Correct Answer
- 0011
- 1. A 4-bit ring counter is loaded with a single 1. The frequency of any given output is ________.
Options- A. the same as the clock
- B. twice the clock frequency
- C. one-half the clock frequency
- D. one-fourth the clock frequency Discuss
- 2. Assume a LOW logic level is placed on the SHIFT/LOAD input of a 74195 shift register. The output will change ________.
Options- A. immediately
- B. if the CLOCK is also LOW
- C. on the next clock leading edge
- D. depending on the J and K inputs Discuss
- 3. A Johnson counter, constructed with N flip-flops, has how many unique states?
Options- A. N
- B. 2N
- C. 2N
- D. N2 Discuss
- 4. A type of shift register that requires access to the Q outputs of all stages is ________.
Options- A. parallel in/serial out
- B. serial in/parallel out
- C. serial in/serial out
- D. a bidirectional shift register Discuss
- 5. The ring and Johnson shift counters are uncommon circuits that are similar to synchronous counters.
Options- A. True
- B. False Discuss
- 6. A type of shift register in which the Q or Q output of one stage is not connected to the input of the next stage is ________.
Options- A. parallel in/serial out
- B. serial in/parallel out
- C. serial in/serial out
- D. parallel in/parallel out Discuss
- 7. An 8-bit serial in/parallel out shift register is clocked at 4 MHz and is used to delay a serial digital signal by 1.25 µs. The output that has the proper delay is ________.
Options- A. QE
- B. QF
- C. QG
- D. QH Discuss
- 8. Assume a 4-bit parallel in/serial out shift register is loaded with a binary number. How many clock pulses are required after the parallel load has occurred before the first bit in the sequence appears on the serial output line?
Options- A. 0
- B. 1
- C. 2
- D. 3 Discuss
- 9. Shifting a binary number to the left by one position is equivalent to ________.
Options- A. multiplying by two
- B. multiplying by four
- C. dividing by two
- D. dividing by four Discuss
- 10. Assume an 8-bit serial in/parallel out shift register needs to be cleared but has no clear input. How many clock cycles are required before a zero applied to the input appears on the QH output?
Options- A. 1
- B. 7
- C. 8
- D. 9 Discuss
Shift Registers problems
Search Results
Correct Answer: one-fourth the clock frequency
Correct Answer: on the next clock leading edge
Correct Answer: 2N
Correct Answer: serial in/parallel out
Correct Answer: False
Correct Answer: parallel in/parallel out
Correct Answer: QE
Correct Answer: 1
Correct Answer: multiplying by two
Explanation:
Shifting a binary number by one bit is equivalent to multiplying (when shifting to the left) or dividing (when shifting to the right) the number by 2.
Correct Answer: 8
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