October 2006
Intermediate to advanced
544 pages
20h 23m
English
Content preview from Digital Systems: Principles and Design
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471Hazards and Pulse Mode Sequential Circuits
FIGURE 19.3 A circuit with two outputs, which are two external inputs X1 and X 0 to an asynchronous circuit element with X1
having a preceding combination circuit with static-1 hazard due to the use of two paths one for X1’ and other for X1’.
TABLE 19.1 Excitation-cum- Transition table* for an exemplary circuit consisting of two circuit elements one with a very small
propagation and other with a significant delay
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
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