October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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480
Digital Systems
TABLE 19.6 Excitation-cum- Transition table for an asynchronous sequential circuit exemplary circuit-6, which has (Table
18.5)
Present Next state after transition (x
q0
, x
q1
) Present output Y
0
state
(x
q0
, x
q1
) Input Input Input Input Input Input Input Input
X
1
X
0
= 00 X
1
X
0
= 01 X
1
X
0
= 10 X
1
X
0
= 11 X
1
X
0
= 00 X
1
X
0
= 01 X
1
X
0
= 10 X
1
X
0
= 11
0, 0 0, 1 0, 0 1, 0 1, 0 0 0 1 1
0, 1 0, 1 0, 1 1, 1 1, 0 1 0 1 0
1, 0 0, 1 1, 1 0, 0 0, 1 1 1 1 1
1, 1 0, 1 0, 0 1, 1 1, 0 0 1 0 1
Suppose inputs X
1
X
0
are at 11. Therefore, the stable state as per column 5 row 3 is (0, 1)
with output Y = 1. Let X
0
change from 1 to 0. Expected stable state is (1, 0)
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