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I need to build a 4 x 1 mux using only logic gates. Can someone help me, I don't even know where to start? |
November 15, 2016 |
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Yes, thats totally possible. The first thing to do is to get a 2 x 1 mux working. In this design I use AND, a NOT gate, and an OR gate. Its not super easy to see how this works by just staring at it, but I suggest you play with the inputs and see the results at each stage of the circuit to get a handle of how it works. Once we have a two input mux working you need to chain them together to make your 4 input mux. Notice how you can use one selection input to mux between the "top" or "bottom" input of each of your 2 input muxes, and then use another to select between the outputs of your first stage. I hope that makes sense! |
by agiustino45 November 16, 2016 |
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Isnt a mux a logic gate already? Do you mean how do you make a 4x1 mux out of 2x1 muxes? That's pretty easy. Click and run - it simulates! I made it be an XOR but you can change the "0" and "1" bits on the data inputs (in00, in01, in10, in11) and make it do whatever. That's a way to do it with three 2x1 muxes. Two stages, one for each bit of the selector. |
by dnadya November 16, 2016 |
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