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A. a, c, d, e, f, g B. a, c, d, e, f C. a, b, c, f, g D. c, d, e, f, g E. a, b, c, d, e, f
3. The circuit below can’t count _______. A. up B. down C. up and down D. None E. It is not a counter
4. 7447 is A. 3*8 decoder B. 4-bit magnitude comparator C. priority encoder D. D flip-flop E. BCD-to-seven-segment decoder/driver
5. Master-reset input is the input A. to initialize the states of all flip-flops in the system B. to initialize the states of all flip-flops in the system, when clock pulse will appear C. to change the states of all flip-flops in the system D. To clear all flip-flops asynchronously E. to set all flip-flops asynchronously
6. Enable input is the input A. to make a device active B. to provide the normal device’s operation C. to control the circuit operation D. to make the circuit sensitive E. to have part of the circuit active
7. 74192 is A. up/down counter B. a BCD counter C. a BCD decade counter D. a BCD decade up/down counter E. a register
8. The terminal count up (TCu) and terminal count down (TCd) of 74193 are normally ____. The TCu is used to indicate that ____ count is reached. A. HIGH, 9th B.LOW, 9th C. HIGH, 15th D. LOW, 15 E. LOW, maximum 9. What can you say about state of diodes 1, 2, 3 in the picture?
A. reverse, forward, reverse B. reverse, forward, forward C. forward, reverse, forward D. Reverse, reverse, forward E. forward, forward, reverse
10. Parallel load input is used to change the counter _____ regardless of the conditions of the clock _______. A. inputs, output B. inputs, outputs C. outputs, input D. outputs, inputs E. output, input
LABORATORY WORK # 14.
BIDIRECTIONAL SHIFT REGISTER.
Aims: investigate operation of the registers, improving students’ design and analytical skills.
PREPARATION TO LAB WORK.
1. Learn the information about registers. 2. Draw the circuit (using Scheme Design System) for 4-bit bidirectional shift register, connecting outputs of the register to LEDs as shown in experiment 14A. 3. Fill in table theoretically. 4. Construct the circuit (using Scheme Design System) for 8-bit bidirectional shift regidter on the basis of experiment 14A. Use the resulting scheme in experiment 14B. 5. Answer the questions in writing form: 5.1. What is register? 5.2. What types of registers do you know? 5.3. Explain parallel-in serial-out register. 5.4. Explain 7447 principle of operation. 5.5. Explain 74192 principle of operation.
Date: 2015-12-11; view: 878
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