Digital Electronics - Logic Gates - Discussion

Simply NOR means not+or so in 3 cases of or gate is high if any one of the input is high or both the inputs are high the output is high but in only one case the two inputs are low the output is low. the inversion is added the or gate is changed to nor gate in this case only 1 input is high the two inputs are low.

FOR NOR GATE:
inputs output
0 0 0 1
0 0 1 0
0 1 0 0
0 1 1 0
1 0 0 0
1 0 1 0
1 1 0 0
1 1 1 0

NOR is NOT of OR. If both the input is low for OR gate then output will be zero. But NOT will convert 0 into 1.

OR + NOT = NOR.

OR:
A B Y
0 0 0

THEN

NOT:
Y Y'
0 1