G1
A
B
F
A B F
L L L
L H L
H L L
H H H
Electrical Function
Table ( 电气功能表 )
A B F
0 0 0
0 1 0
1 0 0
1 1 1
A B F
1 1 1
1 0 1
0 1 1
0 0 0
Positive-Logic
( 正逻辑 ) :
F = A·B
Negative-Logic
( 负逻辑 ) :
F = A+B
The relationship of Positive-Logic Convention
and Negative-Logic Convention are Duality
A
B
F
A’=A
B’=B
F = F’
[F(X1,X2,…,Xn
,
+
,
.,’)]’ = F
D
(X1’,X2’,…,Xn’,+,.,’)