388
Digital Electronics
Q
Q
–
K
J
Clk
Master
FF
Q
Q
–
K
J
Clk
Slave
FF
(a)
PR
0
1
0
1
1
1
1
CLR
1
0
0
1
1
1
1
CLK
X
X
X
J
X
X
X
0
1
0
1
K
X
X
X
0
0
1
1
Q n+1
1
0
Q n
1
0
Q n+1
0
1
0
1
Q n
Toggle
Unstable
(b)
Figure 10.30 Master–slave flip-flop.
PR
1
0
1
0
0
0
0
CLR
0
1
1
0
0
0
0
CLK
X
X
X
J
X
X
X
0
1
1
0
K
X
X
X
1
0
1
0
Q n+1
1
0
1
0
Q n
Q n+1
0
1
0
1
Q n
Toggle
Unstable
Q
Q
K
J
Clk FF
Pr
Cl
(a)
(b)
Figure 10.31 Example 10.3.