LOGIC DESIGN LABORATORY MANUAL - VTU e-Learning Centre

Logic Design Laboratory Manual 60
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Up counter
Down counter
CLK Q D Q C Q B Q A
0 0 0 0 0
1 0 0 0 1
2 0 0 1 0
3 0 0 1 1
4 0 1 0 0
5 0 1 0 1
6 0 1 1 0
7 0 1 1 1
8 1 0 0 0
9 1 0 0 1
10 1 0 1 0
11 1 0 1 1
12 1 1 0 0
13 1 1 0 1
14 1 1 1 0
15 1 1 1 1
16 0 0 0 0
CLK Q D Q C Q B Q A
0 1 1 1 1
1 1 1 1 0
2 1 1 0 1
3 1 1 0 0
4 1 0 1 1
5 1 0 1 0
6 1 0 0 1
7 1 0 0 0
8 0 1 1 1
9 0 1 1 0
10 0 1 0 1
11 0 1 0 0
12 0 0 1 1
13 0 0 1 0
14 0 0 0 1
15 0 0 0 0
16 1 1 1 1
b) Design up counter for preset value 0010 and N=10
CIRCUIT DIAGRAM