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Engineering Digital Design
book

Engineering Digital Design

by Richard F. Tinder
January 2000
Intermediate to advanced content levelIntermediate to advanced
884 pages
29h 39m
English
Academic Press
Content preview from Engineering Digital Design
412 CHAPTER 9 / PROPAGATION DELAY AND TIMING DEFECTS
FIGURE 9.19
Demonstration of function hazard formation. (a) An XOR gate. (b) Timing diagram showing produc-
tion of a function hazard when inputs A and B are changed in close proximity to each other.
9.4 FUNCTION HAZARDS
In the expression for Z
SOP
given by Eq. (9.7), it is observed that pairs of terms such as
B
¯
CD and C
¯
D
¯
E or
¯
A
¯
D
¯
E and ABE each contain two couple variables. These pairs of terms
are not coupled terms and cannot produce static hazards in the sense of Section 9.2. Also,
their ANDed residues are always logic 0 as are the ORed residues logic 1 for pairs of
s-terms containing two (or
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Publisher Resources

ISBN: 9780126912951