In this exercise, we build an 8 way, 16 bit Mux. What this means is that there are eight input arrays (of 16 bits each), for which we will need 3 selectors, and these selectors will select one of the eight input lines to appear as the output.
If we look at the truth table below, we notice that we can apply a 4 way Mux to lines A,B,C,D (using sel[0], ans sel[1]) and another 4 way Mux to E, F, G, H (using sel[0], ans sel[1]). This will result in two lines (one from each set moving ahead). We can then apply a simple Mux to select from one of them, using sel[2].
If we look at the truth table below, we notice that we can apply a 4 way Mux to lines A,B,C,D (using sel[0], ans sel[1]) and another 4 way Mux to E, F, G, H (using sel[0], ans sel[1]). This will result in two lines (one from each set moving ahead). We can then apply a simple Mux to select from one of them, using sel[2].
The code for the 8 way 16 bit Mux is embedded below:
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