MIL-M-38510111D
21 |
8election |
Active low data 11 |
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M = H Logic functions |
M + L; Arithmetic operations |
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83 |
82 |
81 |
80 |
Cn = 0, C n = 1= H |
Cn = 1, C n = 0 = L |
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0 |
L |
L |
L |
L |
F = A |
F = A minus 1 |
F = A |
1 |
L |
L |
L |
H |
F = AB |
F = AB minus 1 |
F = AB |
2 |
L |
L |
H |
L |
F = A + B |
F = AB minus 1 |
F = A B |
3 |
L |
L |
H |
H |
F = 1 |
F = minus 1 (2's compl) |
F = zero |
4 |
L |
H |
L |
L |
F = A + B |
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 |
6 |
L |
H |
H |
L |
F = A B B |
F = A minus B minus 1 |
F = A minus B |
7 |
L |
H |
H |
H |
F = A + B |
F = A + B |
F = (A + B ) plus 1 |
8 |
H |
L |
L |
L |
F = A B |
F = A plus (A +B) |
F = A plus (A + B) plus 1 |
9 |
H |
L |
L |
H |
F = A B B |
F = A plus B |
F = A plus B plus 1 |
10 |
H |
L |
H |
L |
F = B |
F = AB 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 31 |
F = A plus A plus 1 |
13 |
H |
H |
L |
H |
F = AB |
F = AB plus A |
F = AB plus A plus 1 |
14 |
H |
H |
H |
L |
F = AB |
F = AB plus A |
F = AB plus A plus 1 |
15 |
H |
H |
H |
H |
F = A |
F = A |
F = A plus 1 |
11 The table shown applies for negative logic. If positive logic is used, active low data becomes active high data.
21 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 low data
When Cn is low and Cn+4 is low, the A ≤ B. When Cn is high and Cn+4 is low, the A < B. When Cn is low and Cn+4 is high, the A > B. When Cn is high and Cn+4 is high, the A � B.
31 Each bit is shifted to the next more significant position.
Figure 3. Truth tables and logic equations for device type 01 - Continued.
15
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