Discussion
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- Question
The 74121 nonretriggerable multivibrator can have the output pulse set by a single external component. This component is a(n) ________.
Options- A. capacitor
- B. inductor
- C. resistor
- D. LED
- Correct Answer
- capacitor
- 1. An edge-triggered flip-flop can change states only when ________.
Options- A. the trigger is HIGH
- B. the D input is HIGH
- C. the trigger is LOW
- D. the trigger input changes levels Discuss
- 2. The inputs on a 7474 D flip-flop are S, R, D, and CLK ________ is/are synchronous.
Options- A. Only S
- B. S and R
- C. Only D
- D. All of the above. Discuss
- 3. Setup time specifies ________.
Options- A. the minimum time for the control levels to be maintained on the inputs prior to the triggering edge of the clock in order for data to be reliably clocked into the FF
- B. the maximum time interval required for the control levels to remain on the inputs before the triggering edge of the clock in order for the data to be reliably clocked out of the FF
- C. how long the operator has in order to get the flip-flop running before the maximum power level is exceeded
- D. how long it takes the output to change states after the clock has transitioned Discuss
- 4. The key to edge-triggered sequential circuits in VHDL is the ________.
Options- A. ARCHITECTURE
- B. PROCESS
- C. FUNCTION
- D. VARIABLE Discuss
- 5. An input which can only be accepted when an enable or trigger is present is called asynchronous.
Options- A. True
- B. False Discuss
- 6. In VHDL, each instance of a component is given a name followed by a ________ and the name of the library primitive.
Options- A. function
- B. signal
- C. semicolon
- D. colon Discuss
- 7. In synchronous systems, the exact times at which any output can change state are determined by a signal commonly called the ________.
Options- A. traffic
- B. D
- C. flip-flop
- D. clock Discuss
- 8. Assume a J-K flip-flop has 1s on the J and K inputs. The next clock pulse will cause the output to ________.
Options- A. set
- B. reset
- C. latch
- D. toggle Discuss
- 9. If an input is activated by a signal transition, it is ________.
Options- A. hair-triggered
- B. line-triggered
- C. pulse-triggered
- D. edge-triggered Discuss
- 10. Most people would prefer to use ________ over HDL.
Options- A. graphic descriptions
- B. functions
- C. VHDL
- D. AHDL Discuss
Flip-Flops problems
Search Results
Correct Answer: the trigger input changes levels
Correct Answer: All of the above.
Correct Answer: the minimum time for the control levels to be maintained on the inputs prior to the triggering edge of the clock in order for data to be reliably clocked into the FF
Correct Answer: PROCESS
Correct Answer: False
Correct Answer: colon
Correct Answer: clock
Correct Answer: toggle
Correct Answer: edge-triggered
Correct Answer: graphic descriptions
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