448
Digital Electronics
X
A
CB
1
X
X
X
A
CB
CB
CB
(a)
X
A
X
X
X
A
(b)
1
X
A
X
A
(d)
1
1
X
X
A
X
A
(e)
1
X
X
CB
CB
CB
CB
CB
CB
CB
CB
CB
CB
CB
CB
X
A
X
X
X
A
(f)
CB
CB
CB
CB
X
X
X
X
A
X
X
X
A
(b)
1
CB
CB
CB
CB
X
X
X
1
X
X
X
X
X
X
1
X
Figure 11.32 Modified Karnaugh maps (example 11.9).
Figure 11.33 Hardware implementation of the counter circuit (example 11.9).