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  • Question

  • A D flip-flop can be made to toggle by ________.


  • Options
  • A. connecting to Q to D
  • B. connecting to Q to D
  • C. connecting D low
  • D. connecting D high

  • Correct Answer
  • connecting to Q to D 

    • Counters problems

    Search Results

    • 1. Referring to the function table given below, taking the CLEAR, S1, and S0 inputs all HIGH ________.


    • Options
    • A. will inhibit the operation of the register
    • B. will reset the parallel registers and inhibit the serial data inputs
    • C. will cause the parallel data inputs to be loaded and passed to the parallel data outputs
    • D. will depend on what values are loaded into the parallel data inputs
      • Discuss
    • 2. The minimum number of flip-flops that can be used to construct a modulus-5 counter is ________.

    • Options
    • A. 3
    • B. 5
    • C. 8
    • D. 10
      • Discuss
    • 3. The circuit shown below is a ________.


    • Options
    • A. parallel in/serial out register
    • B. serial in/parallel load register
    • C. multiplexer
    • D. demultiplexer
      • Discuss
    • 4. ________ is the modulus of the counter shown below.


    • Options
    • A. 200
    • B. 19
    • C. 0.005
    • D. 5000
      • Discuss
    • 5. In general, when using a scope to troubleshoot digital systems the instrument should be triggered by ________.

    • Options
    • A. the A channel or channel 1
    • B. the vertical input mode, when using more than one channel
    • C. the system clock
    • D. line sync, in order to observe troublesome power line glitches
      • Discuss
    • 6. The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for QB is shown by waveform ________.


    • Options
    • A. synchronous, a
    • B. asynchronous, b
    • C. synchronous, c
    • D. asynchronous, d
      • Discuss
    • 7. In VHDL, if we need to remember a value it must be stored in a ________.

    • Options
    • A. function
    • B. type declaration
    • C. variable
    • D. process
      • Discuss
    • 8. The circuit shown below is a ________.


    • Options
    • A. Johnson counter
    • B. ring counter
    • C. decade counter
    • D. BCD counter
      • Discuss
    • 9. Modulus refers to ________.

    • Options
    • A. a method used to fabricate decade counter units
    • B. the modulus of elasticity, or the ability of a circuit to be stretched from one mode to another
    • C. an input on a counter that is used to set the counter state, such as UP/DOWN
    • D. the maximum number of states in a counter sequence
      • Discuss
    • 10. The decimal equivalent of the largest number that can be stored in a 4-bit binary counter is ________.

    • Options
    • A. 8
    • B. 15
    • C. 16
    • D. 32
      • Discuss

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