I am experiencing difficulties using Logisim whilst trying to implement a simple 2-to-1 MUX. I keep getting "Incompatible Widths" error messages no matter how I connect it. Any idea what's causing this and how it may be fixed?
Electrical – Help using MUX in Logisim
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Related Solutions
You need to use a splitter component (first item under "Wiring") when combining multiple 1-bit signals into a bus, or when separating them back out. Simply wiring them together, like you've done, doesn't work.
Here's what it should look like:
Note that you'll need to split and recombine the output from each of the adders -- for instance, the input to the second adder is made up of {CO, S3, S2, S1}, not {S3, S2, S1, S0}.
Use the splitter component to combine four one-bit signals into a four-bit bus:
Best Answer
I think mux databits needs to be set to 1. If you right click on the mux or your pins, you can change the number of databits in the lefthand attribute window. Also, on the mux, you probably don't need the enable input, so turn that off.
Your mux should have only 1 output line. Your control line is supposed to select which of your inputs will be connected to your single output line. Having 2 output lines doesn't fit the normal design of a 2-line to 1-line mux.
You can assign wider paths to the mux inputs and outputs, but it doesn't appear to be what you are trying to do in this case.