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  • Question

  • The circuit given below has no output on Q1 when examined with an oscilloscope. All J-K inputs are HIGH, the CLK signal is present, and the Q0 is toggling. The C input of FF1 is a constant LOW. What could be causing the problem?

    The circuit given below has no output on Q1 when examined with an oscilloscope. All J-K inputs are H


  • Options
  • A. The Q0 output should be connected to the J input of FF1.
  • B. The output of FF0 may be shorted to ground.
  • C. The input of FF1 may be shorted to ground.
  • D. Either the output of FF0 or the input of FF1 may be shorted to ground.

  • Correct Answer
  • Either the output of FF0 or the input of FF1 may be shorted to ground. 

    • More questions

    • 1. A 1-of-8 octal decoder has eight outputs and decodes an input of ________ bit(s).

    • Options
    • A. three
    • B. two
    • C. four
    • D. one
      • Discuss
    • 2. A four-line multiplexer must have as inputs four data inputs and two select inputs.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Basically, a multiplexer changes parallel data inputs to a serial output.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. In a positive logic system, the HIGH level is usually represented by ________.

    • Options
    • A. 0 V
    • B. +1 V
    • C. +5 V
    • D. +9 V
      • Discuss
    • 5. Eight bits of digital data are normally referred to as a:

    • Options
    • A. group.
    • B. byte.
    • C. word.
    • D. cell.
      • Discuss
    • 6. The JTAG signals are named TDI, TDO, TMS, and TCK.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The exclusive-OR provides a LOW input if one input or the other input is HIGH.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A burst refresh and a normal memory operation of a DRAM can be interspersed.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. When extremely critical timing is required, a quartz crystal can be used.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. How many 2K × 8 ROM chips would be required to build a 16K × 8 memory system?

    • Options
    • A. 2
    • B. 4
    • C. 8
    • D. 16
      • Discuss

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