Counters – Exercise – 3

120. It is a characteristic of ring counters that the ________ equal to the number of flip-flops in the register.

(a) number of invalid states is
(b) number of CASE statements is
(c) modulus is
(d) other states are

121. The ________ counter in the Altera library has controls that allow it to count up or down, and perform synchronous parallel load and asynchronous cascading.

(a) 74134
(b) LPM
(c) synchronous
(d) AHDL

122. The decimal equivalent of the largest number that can be stored in a 4-bit binary counter is ________.

(a) 8
(b) 15
(c) 16
(d) 32

123. A 4-bit binary up counter has an input clock frequency of 20 kHz. The frequency of the most significant bit is ________.

(a) 1.25 kHz
(b) 2.50 kHz
(c) 160 kHz
(d) 320 kHz

124. An asynchronous binary up counter, made from a series of leading edge-triggered flip-flops, can be changed to a down counter by ________.

(a) taking the output on the other side of the flip-flops ( instead of Q)
(b) clocking of each succeeding flip-flop from the other side ( instead of Q)
(c) changing the flip-flops to trailing edge triggering
(d) all of the above

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