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Home Digital Electronics Digital System Projects Using HDL Comments

  • Question
  • In the digital clock project, the purpose of the frequency prescaler is to:


  • Options
  • A. find the basic frequency.
  • B. transform a 60 pps input to a 1 pps timing signal.
  • C. prevent the clock from exceeding 12:59:59.
  • D. allow the BCD display to have a value from 00?59.

  • Correct Answer
  • transform a 60 pps input to a 1 pps timing signal. 


  • Digital System Projects Using HDL problems


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    • 1. Which is not a major block of an HDL frequency counter?

    • Options
    • A. Display register
    • B. Decoder/display
    • C. Timing and control unit
    • D. Bit shifter
    • Discuss
    • 2. The accuracy of the frequency counter depends on the:

    • Options
    • A. system clock frequency.
    • B. number of displayed digits.
    • C. sampling rate.
    • D. display update rate.
    • Discuss
    • 3. Why should a real hardware functional test be performed on the HDL stepper motor design?

    • Options
    • A. To check the speed of the software
    • B. To check the current levels in the motor
    • C. To check the voltage levels of the real outputs
    • D. To provide a fully operational system
    • Discuss
    • 4. What does the major block of an HDL code emulation of a keypad include?

    • Options
    • A. A sequencer
    • B. A clock
    • C. A multiplexer
    • D. A ring counter
    • Discuss
    • 5. How is the output frequency related to the sampling interval of a frequency counter?

    • Options
    • A. Directly with the sampling interval
    • B. Inversely with the sampling interval
    • C. More precision with longer sampling interval
    • D. Less precision with longer sampling interval
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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