MIL-M-38510/308B
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2/ |
8election |
Active high data 3/ |
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M = H Logic functions |
M = L; Arithmetic operations |
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83 |
82 |
81 |
80 |
Cn = 0 Cn = 1 = H |
Cn = 1 Cn = 0 = H |
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0 |
L |
L |
L |
L |
F = A |
F = A |
F = A plus 1 |
1 |
L |
L |
L |
H |
F = A + B |
F = A + B |
F = (A + B) plus 1 |
2 |
L |
L |
H |
L |
F = A B |
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 AB |
F = A plus AB plus 1 |
5 |
L |
H |
L |
H |
F = B |
F = (A + B) plus AB |
F = (A + B) plus AB plus 1 |
6 |
L |
H |
H |
L |
F = A ⊕ B |
F = A minus B minus 1 |
F = A minus B |
7 |
L |
H |
H |
H |
F = AB |
F = AB minus 1 |
F = AB |
8 |
H |
L |
L |
L |
F = A + B |
F = A plus AB |
F = A plus AB plus 1 |
9 |
H |
L |
L |
H |
F = A ⊕ B |
F = A plus B |
F = A plus B plus 1 |
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 |
F = (A + B) plus A |
F = (A + B) plus A plus 1 |
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., 83 82 81 80 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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