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Home ‣ Digital Electronics ‣ Describing Logic Circuits See What Others Are Saying!
- 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.
- 1. The flash method of analog-to-digital conversion uses comparators that compare reference voltages with the analog input voltage.
Options- A. True
- B. False Discuss
- 2. BCD arithmetic is performed using base 10 numbers.
Options- A. True
- B. False Discuss
- 3. The gates in this figure are implemented using TTL logic. If the output of the inverter has an internal open circuit, what voltage would you expect to measure at the inverter's output?
Options- A. Less than 0.4 V
- B. 1.6 V
- C. Greater than 2.4 V
- D. All of the above Discuss
- 4. When implementing a complete system application using IC counter chips, output devices such as LED indicators must be configured to operate from the counter outputs.
Options- A. True
- B. False Discuss
- 5. Generally speaking, the synchronous counter requires more circuitry than an asynchronous counter.
Options- A. True
- B. False Discuss
- 6. If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
Options- A. 1
- B. 2
- C. 7
- D. 8 Discuss
- 7. On a CD-ROM, ________ are raised areas representing a 1.
Options- A. mounds
- B. lands
- C. holes
- D. pits Discuss
- 8. What should be done with unused inputs to a TTL NAND gate?
Options- A. let them float
- B. tie them LOW
- C. tie them HIGH Discuss
- 9. Define a race condition for a flip-flop.
Options- A. The inputs to a trigger device are changing slightly before the active trigger edge.
- B. The inputs to a trigger device are changing slightly after the active trigger edge.
- C. The inputs to a trigger device are changing at the same time as the active trigger edge. Discuss
- 10. 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
More questions
Correct Answer: True
Correct Answer: False
Correct Answer: 1.6 V
Correct Answer: False
Correct Answer: True
Correct Answer: 1
Correct Answer: lands
Correct Answer: tie them HIGH
Correct Answer: The inputs to a trigger device are changing at the same time as the active trigger edge.
Correct Answer: With SIGNAL and VARIABLE
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