Digital System Projects Using HDL problems
- 1. In the frequency counter, what is the function of the Schmitt trigger circuit?
Options- A. To reduce input noise
- B. To condition the input signal
- C. To convert non-square waveforms
- D. To provide a usable signal to the display unit Discuss
Correct Answer: To convert non-square waveforms
- 2. In a digital clock application, the basic frequency must be divided down to:
Options- A. 1 Hz.
- B. 60 Hz.
- C. 100 Hz.
- D. 1000 Hz. Discuss
Correct Answer: 1 Hz.
- 3. Which is not a step used to define the scope of an HDL project?
Options- A. Are the inputs and outputs active HIGH or active LOW?
- B. A clear vision of how to make each block work
- C. What are the speed requirements?
- D. How many bits of data are needed? Discuss
Correct Answer: A clear vision of how to make each block work
- 4. In the frequency counter, when is the new count stored in the display register?
Options- A. After disabling the counter
- B. When the count buffer is full
- C. After the sample interval is set
- D. When the timing and control block has put it there Discuss
Correct Answer: After disabling the counter
- 5. In the digital clock project, what is the frequency of the MOD-6 counter in the minutes section?
Options- A. 1 pulse per minute
- B. 6 pulses per minute
- C. 10 pulses per minute
- D. 1 pulse per hour Discuss
Correct Answer: 1 pulse per hour
- 6. In the frequency counter, if the clock generator produces a 100 kHz system clock signal, how many decade counters are required to measure 1 Hz?
Options- A. 6
- B. 5
- C. 4
- D. 3 Discuss
Correct Answer: 5
- 7. In the digital clock project, when does the PM indicator go high?
Options- A. Never
- B. Going from 11:59:59 to 12:00:00
- C. Going from 12:59:59 to 01:00:00
- D. On the falling edge of the clock after enable goes high Discuss
Correct Answer: Going from 11:59:59 to 12:00:00
- 8. Which is not a step in strategic planning for HDL development?
Options- A. There must be a way to test each piece.
- B. Each block must fit together to make up the whole system.
- C. The names of each input and output must be known.
- D. The exact operation of each block must be thoroughly defined and understood. Discuss
Correct Answer: The names of each input and output must be known.
- 9. In a frequency counter, what happens at high frequencies when the sampling interval is too long?
Options- A. The counter works fine.
- B. The counter undercounts the frequency.
- C. The measurement is less precise.
- D. The counter overflows. Discuss
Correct Answer: The counter overflows.
- 10. In the keypad application, just after the 4 ms mark the simulation imitates the release of the key by changing the column value back to F hex, which causes the d output to go into its Hi-Z state. On the next rising clock edge, what happens to dav?
Options- A. It goes HIGH.
- B. It goes LOW.
- C. It goes to Hi-Z.
- D. It goes to 1111H. Discuss
Correct Answer: It goes LOW.
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