A 3 to 8 decoder is shown below:
All output lines of decoder will be high when all the input I1, I2, I3 are;
- are high and G1 , G2 are low
- are high and G1 is high , G2 is low
- are high and G1 is low , G2 is high
- are high and G1 , G2 are high
Please someone help to understand the logic behind this question. Why we have to disable the Decoder to make all the outputs high ?