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Page Title:
Figure 3. Truth tables and logic equations for device type 01. |
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|  MIL-M-38510/11D
Active high data 1/
Selection
M=H
M + L; Arithmetic operations
2/
S3
S2
S1
S0
Logic functions
Cn = 0, C n = 1= H
Cn = 1, C n = 0 = L
F=A
F = A plus 1
0
L
L
L
L
F= A
F=A+B
F = (A + B) plus 1
1
L
L
L
H
F = A +B
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 = A plus A B
F = A plus A B plus 1
F = AB
5
L
H
L
H
F= B
F = (A + B) plus A B
F = (A + B) plus A B plus 1
F=A ⊕ B
F = A minus B minus 1
F = A minus B
6
L
H
H
L
7
L
H
H
H
F = A B minus 1
F = AB
F = AB
F = A plus AB
F = A plus AB plus 1
8
H
L
L
L
F= A+B
F = A plus B
F = A plus B plus 1
9
H
L
L
H
F = A ⊕B
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
3/
F = A plus A plus 1
F = (A +B) plus A
F = (A + B) plus A plus 1
13
H
H
L
H
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/ The table shown applies for negative logic. If positive logic is used, active low data becomes active high data.
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 low data
When Cn is high and Cn+4 is high, the A ≤ B.
When Cn is low and Cn+4 is high, the A < B.
When Cn is high and Cn+4 is low, the A > B.
When Cn is low and Cn+4 is low, the A ≥ B.
3/ Each bit is shifted to the next more significant position.
Figure 3. Truth tables and logic equations for device type 01.
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