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Page Title:
Figure 2. Truth tables and logic equations for device type 01-cont. |
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|  MIL-M-38510/308B
Active low data 3/
Selection
M=H
M = L; Arithmetic operations
2/
S3
S2 S1
S0
Logic functions
Cn = 0 = L
Cn = 1 = H
0
L
L
L
L
F = A minus 1
F=A
F= A
1
L
L
L
H
F = AB minus 1
F = AB
F = AB
2
L
L
H
L
F= A+B
F = A B minus 1
F = AB
3
L
L
H
H
F=1
F = minus 1 (2's compl)
F = zero
F = A +B
4
L
H
L
L
F = A plus (A + B )
F = A plus (A + B ) plus 1
5
L
H
L
H
F= B
F = AB plus (A + B )
F = AB 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
F = A +B
F = (A + B ) plus 1
8
H
L
L
L
F = A plus (A + B)
F = A plus (A + B) plus 1
F= AB
F = A⊕ B
9
H
L
L
H
F = A plus B
F = A plus B plus 1
10
H
L
H
L
F=B
F = A B plus (A + B)
F = A B plus (A + B) plus 1
11
H
L
H
H
F=A+B
F=A+B
F = (A + B) plus 1
12
H
H
L
L
F=0
F = A plus A
1/
F = A plus A plus 1
13
H
H
L
H
F = AB plus A
F = AB plus A plus 1
F = AB
14
H
H
H
L
F = AB
F = A B plus A
F = A B plus A plus 1
15
H
H
H
H
F=A
F=A
F = A plus 1
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 low and Cn+4 is low, then A ≤ B
When Cn is high and Cn+4 is low, then A < B
When Cn is low and Cn+4 is high, then A > B
When Cn is high and Cn+4 is high, then A ≥ B
3/ The table shown applies for negative logic. If negative logic is used, active low data becomes active high data.
FIGURE 2. Truth tables and logic equations for device type 01 - Continued.
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