Sample Class Test #2

1. Show by means of a timing diagram how a glitch could occur at the output of a two input NOR gate when the input changes from 01 to 10

2. Each bit in a binary word is stored in a flip-flop, how many flip-flops will be complemented when the number below is increased by adding 1

                  11011011

3. Implement the function below with an 4 x 1 multiplexer

                  

EITHER DO QUESTION 4A OR QUESTION 4B BUT NOT BOTH

4A. A 3-bit finite state device, built with J-K flip-flops, has the following flip-flop input functions.

                  

Draw the State Diagram
What are the unused states ?
Is the device self correcting ?

4B. A 3-bit finite state device, built with J-K flip flops, has the following repeating state sequence

                  3,7,1,2,4,6......

Find the simplified flip flop input functions

5. Implement the following function using a 3 x 8 decoder and one additional logic gate.

                  

6. Give the binary string for both the next and the previous number in the Gray Code sequence

                  10010

© copyright 2010 Stephen E. Mendes, Barbados.


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