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A. 1 B. 2 C. 3 D. 4 E. 5
9. What is the input equation for D flip-flop for the circuit below?
A. A+X B. AÅ X C. AÅ XÅ Y D. XÅ Y E. XÅ Y¤A
10. For the circuit below X=1, B=1, Y=1, C=1. What will be the next state for the flip-flop? A. set B. reset C. complement D. No change E. none
LABORATORY WORK # 12. COUNTERS.
Aims: investigate the operations of switch tail ring counter and ripple counter.
PREPARATION TO LAB WORK.
1. Learn the information about flip-flops, registers and counters. 2. Prepare logic diagram of 4-stage switch-tail ring counter using 4 D-flip-flops, and draw it with application of Scheme Design System. This circuit will be used in experiment 12A. 3. Construct a 4-bit asynchronous ripple counter with 4 JK-flip-flops for the experiment 12B, and draw it with application of Scheme Design System. 4. Answer the question below in written form. 4.1. What is a word-time signal? 4.2. What is a ring counter? 4.3. What is switch tail ring counter? 4.4. What is ripple counter? 4.5. What is BCD counter? 4.6. What is the difference between synchronous and asynchronous counters?
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