Digital System Projects Using HDL problems
- 1. In an HDL stepper motor design, why is there more than one mode?
Options- A. To change the speed of the stepper motor
- B. To change the direction of the stepper motor
- C. To direct drive the stepper motor
- D. All of the above Discuss
Correct Answer: All of the above
- 2. For the frequency counter, which is not a control signal from the control and timing block?
Options- A. Clear
- B. Enable
- C. Reset
- D. Store Discuss
Correct Answer: Reset
- 3. List three basic blocks in the digital clock project.
Options- A. MOD-60, MOD-12 counters
- B. MOD-5, MOD-10, MOD-12 counters
- C. MOD-60, MOD-10 counters
- D. MOD-6, MOD-12, and MOD-10 counters Discuss
Correct Answer: MOD-6, MOD-12, and MOD-10 counters
- 4. In the keypad application, what does the preset state of the ring counter define?
Options- A. The proper output of the column encoder
- B. The NANDing of the rows
- C. The NANDing of the columns
- D. The proper output of the row encoder Discuss
Correct Answer: The proper output of the row encoder
- 5. Which is not a step that should be followed in project management?
Options- A. Overall definition
- B. System documentation
- C. Synthesis and testing
- D. System integration Discuss
Correct Answer: System documentation
- 6. What are two ways to remember the current state of a counter in VHDL?
Options- A. With FUNCTIONS and PROCESS
- B. With counters and timers
- C. With SIGNAL and VARIABLE
- D. With bit types Discuss
Correct Answer: With SIGNAL and VARIABLE
- 7. In a full-step sequence involving two flip-flops driving four coils of a stepper motor, how far will the stepper motor step?
Options- A. 90°
- B. 45°
- C. 30°
- D. 15° Discuss
Correct Answer: 15°
- 8. In the digital clock project, what type of counter is used to count to 59 seconds?
Options- A. MOD-60
- B. MOD-6
- C. BCD
- D. BCD followed by a MOD-6 Discuss
Correct Answer: BCD followed by a MOD-6
- 9. In an HDL application of a stepper motor, after an up/down counter is built what is done next?
Options- A. Build the sequencer
- B. Test it on a simulator
- C. Test the decoder
- D. Design an intermediate integer variable Discuss
Correct Answer: Test it on a simulator
- 10. What does the ring counter in the HDL keypad application do when a key is pressed?
Options- A. Count to find the row
- B. Freeze
- C. Count to find the column
- D. Start the D flip-flop Discuss
Correct Answer: Freeze
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