Counters and Registers
417
Q 0
FF0
J
K
Q 1
FF1
J
K
Q 2
FF2
J
K
Q 3
FF3
J
K
1
Clock In
Q 0
Clk
Clear
Clk
Clear
Clk
Clear
Clk
Clear
Q 1
Q 2
Q 3
1
2
3
4
5
6
7
8
9 10
1 1
12
Clock In
1
1
1
Q 0
0
Q 1
0
Q 2
0
Q 3
1
0
NAND
Output
0
(a)
(b)
Figure 11.3 Binary ripple counter with a modulus of less than 2
N .