# COS 116 The Computational Universe Laboratory 6: Digital Logic I

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1 COS 6 The Computational Universe Laboratory 6: Digital Logic I In this lab you ll construct simple combinational circuits with a breadboard and silicon chips. You ll use these circuits to experiment with digital logic. If you get stuck at any point, feel free to discuss the problem with another student or a TA. However, you are not allowed to copy another student s answers. Hand in your lab report at the beginning of lecture on Tuesday, April. Include responses to questions printed in bold. (Number them by Part and Step.) When you assemble the circuit for Majority-of-, you need to show it to your TA. Otherwise you will not get credit for the lab. Also, at the end of the lab you must remove any wires or components that you added to the breadboard and place them back in the plastic box you received. Return this plastic box to the TA before leaving the lab. Breadboards are used to build temporary circuits during prototyping. Their name derives from little holes into which you insert electronic components and connecting wires. You can quickly assemble and disassemble circuits. No soldering required! Here is a picture. + a b c d e f g h i j +

4 the power supply will damage the if you connect it directly to the switch. The resistor reduces the voltage and protects the. 5. Reconnect the power supply to the breadboard. Toggle Switch, and verify that the is on when the switch is to the left and off when the switch is to the right. 6. Rewire your circuit to use Switch instead of switch, and verify that it works. Repeat for Switch and Switch. If any of the switches do not function correctly, ask your TA for assistance. Part : Understanding Logic Gates and Truth Tables Now we understand the gates contained inside our silicon chips, and build a circuit with a single gate. Each chip used today packages several identical gates: 7LS0 chip 7LS08 chip 7LS chip Power Power Power AND AND Ground Ground AND AND Ground 6 gates AND gates gates Notice the small imprinted dot at the top of each chip you ll use this to orient the chip correctly on the breadboard. The upper-right pin on each chip should be connected to power (wire this to the + column on the breadboard), and the lower-left pin should be connected to ground (wire this to the column). The diagram above shows how the remaining pins are assigned to the inputs and outputs of the gates.. Disconnect the power by unplugging the red power supply wire from the breadboard, and remove all the components (except the switch) which you inserted in the previous experiment.. Insert the, resistor, and 7LS08 (AND gate) chip into the right half of the breadboard, as shown in the picture below. Make sure the notch in the COS 6 Lab 6

5 chip is on the top, and make sure the longer lead of the is on the left. The chip may be damaged if you insert it upside down or wire it incorrectly. Jumper wires 7LS08 chip a. Connect the outputs for switches and to the inputs of the AND gate. b. Connect the output from the AND gate to the. c. Connect the chip s power and ground inputs to the + and columns of the breadboard, respectively.. Reconnect the power supply to the breadboard.. Complete the following truth table. Does it match the correct behavior for an AND gate? Switch Switch Right (0) Right (0) Right (0) Left () Left () Right (0) Left () Left () 5. Disconnect the power from the breadboard again. 6. Carefully remove the 7LS08 chip using the chip extractor tool. (Ask your TA if you need help.) COS 6 Lab 6 5

6 7. Insert the 7LS chip ( gates) in the same breadboard location. Again, make sure the notch on the chip is on the top. 8. Reconnect the power. 9. Complete another truth table for the modified configuration. Does your new circuit match the correct behavior for an gate? 0. Repeat steps 5 9 with the 7LS0 chip ( gates). This time, you ll need to rewire the breadboard, since a gate has only one input instead of two like AND and gates. Connect a single switch to the input of the gate, and connect the gate s output to the.. Test your gate circuit until it behaves correctly. Draw a picture of the working design in your notes. Part : Building Combinational Circuits As you saw in the lecture, you can use AND,, and gates to build a circuit to compute any Boolean function. One simple example is the majority function. Given n inputs, the majority function is true if more than half the inputs are true; otherwise it is false. The diagram below shows one way to use AND and gates to build the majority function for inputs. Complete the truth table on the right by examining the circuit diagram. Make sure your results match the majority function. Input A Input B Input C Input A Input B Input C Result AND AND AND Result 0 0 COS 6 Lab 6 6

7 Now you ll construct the majority-of- circuit on the breadboard.. Disconnect the power by unplugging the red power supply wire from the breadboard, and remove all the components you inserted in the previous experiment.. Insert the, resistor, 7LS08 (AND gate) chip, and 7LS ( gate) chip into the right half of the breadboard. Make sure the chip notches are to the top. Wire the power and ground connections for the chips, as shown: 7LS08 chip (AND gates) 7LS chip ( gates). Make connections from Switches,, and to the inputs of three AND gates: COS 6 Lab 6 7

8 7LS08 chip (AND gates) 7LS chip ( gates). Connect the outputs from two of the AND gates to the inputs of one of the gates. Wire the output from that gate, and the output of the third AND gate, to the input of the second gate. Connect the second gate s output to the : 7LS08 chip (AND gates) 7LS chip ( gates) 5. Reconnect the power supply to the breadboard. COS 6 Lab 6 8

9 6. Test your circuit to make sure it matches the truth table for the majority function. If it doesn t, verify that all the connections are correct. When your circuit is working properly, show it to your lab TA so that you can get credit for finishing the lab. Further Questions to answer in your report. Write the truth table for the majority-of- function and represent it with a Boolean expression. Simplify the Boolean expression as well as you can and report the simplest expression you came up with.. Determine the Boolean function that is represented by the following breadboard circuit. Denote each of the inputs and the output of the circuit by a variable, and write the Boolean expression of the function being computed. 7LS chip ( gates) 7LS08 chip (AND gates). Using the chips from this lab, approximately how many gates can fit on a single breadboard? (Ignore the space used for wiring.) Intel s Pentium processor contains approximately 0 million gates. How many breadboards would it take to contain this many gates? Estimate the number of football fields this many breadboards would cover. (State any assumptions you make.) COS 6 Lab 6 9

10 . You verified the correctness of the majority-of- circuit by checking that its behavior matches the truth table. This involved checking = 8 combinations of values by hand. How long would this technique take if you were checking a circuit with 00 inputs? (State any assumptions you make.) How long would it take you if you were as fast as the Pentium processor and could check three billion combinations each second? COS 6 Lab 6 0

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