Exercise: Counters

Questions for: Counters

Which of the following statements are true?
A:
Asynchronous events do not occur at the same time.
B:
Asynchronous events are controlled by a clock.
C:
Synchronous events do not need a clock to control them.
D:
Only asynchronous events need a control clock.
Answer: A
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What is the maximum delay that can occur if four flip-flops are connected as a ripple counter and each flip-flop has propagation delays of tPHL = 22 ns and tPLH = 15 ns?
A:
15 ns
B:
22 ns
C:
60 ns
D:
88 ns
Answer: D
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Four cascaded modulus-10 counters have an overall modulus of ________.
A:
10
B:
100
C:
1,000
D:
10,000
Answer: D
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Which is not an example of a truncated modulus?
A:
8
B:
9
C:
11
D:
15
Answer: A
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For a one-shot application, how can HDL code be used to make a circuit respond once to each positive transition on its trigger input?
A:
By using a counter
B:
By using an active clock
C:
By using an immediate reload
D:
By using edge trapping
Answer: D
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