PHYS345 Electricity and Electronics

Answers for 11/9 Assignment

Answer for 14.4

The sequence of states Q0Q1Q2 is 111, 101, 100, 010, 001, 110, 011, and back to 111.

(000 is excluded and unfortunately does not enter into the sequence.)

Answer for S14.1

Divide-by-3 Timing Diagram

Each Q is cycling once for each 3 CLK pulses; this is a divide-by-3 counter.

Answer for S14.2

For D0:           For D1:           For D2:
 Q2 0  1 
Q0 Q1\  
 00     0   0 
 01     1   1 
 11     0   0 
 10     1   1 
 
 Q2 0  1 
Q0 Q1\  
 00     1   1 
 01     0   0 
 11     0   0 
 10     1   1 
 
 Q2 0  1 
Q0 Q1\  
 00     0   0 
 01     0   0 
 11     0   0 
 10     0   0 
 
D0 = Q'0Q1 + Q0Q'1           D1 = Q'1           D2 = 0

3-bit even-number counter


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Last updated Nov. 18, 1999.
Copyright George Watson, Univ. of Delaware, 1999.