Q2: Below on the left is the logic symbol for a 4:16 Decoder, on the right is the circuit diagram. In DECODER_75154.pdf, on the second page you will see a Function Table for the decoder IC. Note that H = High Level or logic value 1, L = Low Level or logic value 0, X = don't care.

Answer the following questions: - Given G1 and G2 are two enable pins. For the decoder to function, which logic value should we assign to G1 and G2?

- In a decoder, basically we select one output (among all outputs) based on the inputs. Suppose we set the enable pins correctly, and we set A = 0, B = 1, C = 0, D = 1, which output is chosen?

- The chosen output is high or low?

Now think again about the inputs that we have. Given that the output number indicates the decimal value of the inputs, which input (A or B or C or D) should be considered the most significant bit? Which should be the least significant bit?

1G 10VDD Iwo 4:1 Multiplexers D3:0. S1:0: Y: data select output enable 2 1D3-3 1D2-4 1D15 1D0 6 15 2G 14 SO 13 2D3 Gb: 12 2D2 always (1Gb, s, 1D) 112D1 10 2DO0 if (1Gb) 1Y = 0; else 1Y = 1D [S] ; always Q (2Gb, S, 2D) if (2Gb) 2Y = 0; else GND8 74153 4:1 Mux 1G 10VDD Iwo 4:1 Multiplexers D3:0. S1:0: Y: data select output enable 2 1D3-3 1D2-4 1D15 1D0 6 15 2G 14 SO 13 2D3 Gb: 12 2D2 always (1Gb, s, 1D) 112D1 10 2DO0 if (1Gb) 1Y = 0; else 1Y = 1D [S] ; always Q (2Gb, S, 2D) if (2Gb) 2Y = 0; else GND8 74153 4:1 Mux