4-bit Multiplexers

The logic circuitry for a 4-bit multiplexer is shown in the following figure. As you can see, the multiplexer is constructed using 2-bit multiplexers. Every 2-bit multiplexer accepts two bits, one control line, and an "enabled" line. The last module accepts the output from the previous multiplexers, and outputs the result. The first contol line goes to the two first multiplexers and the second control line goes to the last multiplexer.

These are the instructions to play with the circuit:

• Click on the 1's and 0's in green (the inputs) to change their value. To run the simulation with these new values, click on the "Continue" value. The first 2 inputs are control lines. The last input is the "enabled" line.

• The "Reset" button will clear all the input values.

Last modified 1/1/2000 by Juan de Lara ( Juan.Lara@ii.uam.es, http://www.ii.uam.es/~jlara) need help for using this courses?.