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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
8.8 ARITHMETIC AND LOGIC UNITS 367
FIGURE 8.37
An n-bit PALU with operational characteristics given by Figs. 8.34, 8.35, and 8.36, and by Eqs. (8.17).
and (8.18).
that LSB C
in
= 1 in Fig. 8.37 and that the MSB be reserved for the sign bit as dis-
cussed in Section 8.3. For operation (2), the requirements of F and C
out
are that R =
E C
in
= 0110
2
= 6
10
, E = A
¯
B = A B = 1001
2
= 9
10
, and that D =
¯
A + B = 1011 = 11
10
. Operation (3) simply requires that LSB C
in
= 1 when A = 0,
for which the requirements of function F are that R = E C
in
= 0110
2
= 6
10
,
E = B = 1010
2
= 10
10
, and D = 1 = 1111 = 15
10
so that
¯
D = 0 in Eq. (8.18).
The 2’s complement of operation
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Publisher Resources

ISBN: 9780126912951