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Home ‣ Digital Electronics ‣ Describing Logic Circuits Comments
  • Question

  • In VHDL, the mode of a port does not define:


  • Options
  • A. an input.
  • B. an output.
  • C. both an input and an output.
  • D. the TYPE of the bit.

  • Correct Answer
  • the TYPE of the bit. 

    • Describing Logic Circuits problems

    Search Results

    • 1. The special software application that translates from HDL into a grid of 1's and 0's, which can be loaded into a PLD, is called a:

    • Options
    • A. formatter.
    • B. compiler.
    • C. programmable wiring.
    • D. CPU.
      • Discuss
    • 2. Which of the following equations would accurately describe a 4-input OR gate when A = 1, B = 1, C = 0, and D = 0?

    • Options
    • A. 1 + 1 + 0 + 0 = 1
    • B. 1 + 1 + 0 + 0 = 01
    • C. 1 + 1 + 0 + 0 = 0
    • D. 1 + 1 + 0 + 0 = 00
      • Discuss
    • 3. Which of the figures in figure (a to d) is equivalent to figure (e)?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 4. The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):

    • Options
    • A. truth table.
    • B. input logic function.
    • C. Boolean constant.
    • D. Boolean variable.
      • Discuss
    • 5. A NAND gate has:

    • Options
    • A. active-LOW inputs and an active-HIGH output.
    • B. active-LOW inputs and an active-LOW output.
    • C. active-HIGH inputs and an active-HIGH output.
    • D. active-HIGH inputs and an active-LOW output.
      • Discuss
    • 6. For a three-input NOR gate, with the input waveforms as shown below, which output waveform is correct?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 7. An OR gate with inverted inputs functions as:

    • Options
    • A. an AND gate.
    • B. a NAND gate.
    • C. a NOR gate.
    • D. an inverter.
      • Discuss
    • 8. Which of the examples below expresses the associative law of addition:

    • Options
    • A. A + (B + C) = (A + B) + C
    • B. A + (B + C) = A + (BC)
    • C. A(BC) = (AB) + C
    • D. ABC = A + B + C
      • Discuss
    • 9. Which of the following is a form of DeMorgan's theorem?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. Which of the symbols shown below represents an AND gate?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss

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