Question

Can you use Multisim or something similar. I got the truth table and design, but having a hard time with the actual wiring. I  need to see where each cable and light bulb go.

3.4. Multiplexer Multiplexers are very useful components in digital systems. They transfer a large number of information units over a smaller number of channels, (usually one channel) under the control of selection signals. Fig. 3 is a 4-line to l-line MUX. In this circuit, lo, 11, 12, and 13 are one-bit binary data inputs. Si and So are select inputs. When S, and So are 00, input 10 is passed through to the output. Similarly, values of 01, 10, and 11 pass through inputs 11, 12, and 13, respectively, as shown in the truth table for the figure. Construct the circuit and connect the output Veto a LED. Verify its output by setting the select signals S, and So, and then change the four inputs sequentially (one high, three low) to see which input signal is transferred to the output. MUX circuits also can be used to implement random logic functions. Consider the problem of designing a circuit that receives a 4-bit input that represents a month. For this example, 0000 represents January, 0001 corresponds to February, and so on through 1011 for December. The values 1100 through 1111 are not used and you can assume these values will never be input to your circuit. The output generated for each input combination will be 1 if the corresponding month has 31 days and 0 otherwise. The table below summarizes this information. Month January February March April May June Input Value Output Value 00001 00010 00101 0011 0100 0101 01101 0111 10000 10011 10100 1011 1 July August September October November December Use a 74LS151 (8-line to l-line MUX) to design a circuit to implement this 31-day machine. You can use most of the Input Value bits as the select signals of the multiplexer and the output value as an input to the multiplexer. For example, consider the case when you use the three low-order bits of the input value as select signals, and your month is July. The three low-order bits are 110, so your multiplexer would pass input #6 through to the output. Since you want to generate an output of 1 in this case, you would connect a logic 1 to input 6 of the multiplexer. This works fine when the low order three bits correspond only to one month, but what happens when the low order bits correspond to multiple months? For example, if the three low order bits are 000, the month could be either January (0000) or September (1000). In this case, you can do one of two things. First, you can modify input #0 of the multiplexer so it is 1 when your month is January and O when it is September. You can make use of the high-order bit of the input value, the bit that is not used as a select signal, to generate the correct input. An alternative is to input a logic 0 or 1 and modify the output based on the high-order bit representing the month. For this example, either approach can work, but you'll have to do some design work to implement this function correctly.