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Active high data 3/
Selection
M=H
M = L; Arithmetic operations
2/
Logic functions
Cn = 0
Cn = 1
S3
S2
S1
S0
Cn = 1 =H
Cn = 0 =H
0
L
L
L
L
F=A
F = A plus 1
F= A
F = A +B
F=A+B
F = (A + B) plus 1
1
L
L
L
H
2
L
L
H
L
F= AB
F=A+ B
F = (A + B ) plus 1
3
L
L
H
H
F=0
F = minus 1 (2's compl)
F = zero
4
L
H
L
L
F = AB
F = A plus A B
F = A plus A B plus 1
5
L
H
L
H
F= B
F = (A + B) plus A B
F = (A + B) plus A B plus 1
F = AB
6
L
H
H
L
F = A minus B minus 1
F = A minus B
7
L
H
H
H
F = AB
F = A B minus 1
F = AB
8
H
L
L
L
F = A plus AB
F = A plus AB plus 1
F= A +B
F = A B
F = A plus B
F = A plus B plus 1
9
H
L
L
H
10
H
L
H
L
F=B
F = (A + B ) plus AB
F = (A + B ) plus AB plus 1
11
H
L
H
H
F = AB
F = AB minus 1
F = AB
12
H
H
L
L
F=1
F = A plus A
1/
F = A plus A plus 1
13
H
H
L
H
F = (A + B) plus A
F = (A + B) plus A plus 1
F=A+ B
14
H
H
H
L
F=A+B
F = (A + B ) plus A
F = (A + B ) plus A plus 1
15
H
H
H
H
F=A
F = A minus 1
F=A
1/ Each bit is shifted to the next more significant position.
2/ This device (ALU) can be used as a comparator when placed in the subtract mode (i. e., S3 S2 S1 S0 are at
logical levels LHHL respectively) and the following expressions are valid:
Active high data
When Cn is high and Cn+4 is high, then A B
When Cn is low and Cn+4 is high, then A < B
When Cn is high and Cn+4 is low, then A > B
When Cn is low and Cn+4 is low, then A B
3/ The table shown applies for positive logic. If negative logic is used, active high data becomes active low data.
FIGURE 2. Truth tables and logic equations for device type 01.
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