# COS 116 The Computational Universe Laboratory 7: Sequential and Synchronous Circuits

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2 Caution: To avoid damaging chips, before you insert or remove any components from the breadboard, always disconnect the power by unplugging the red power supply connector from the breadboard s connector post. Part 1: Understanding the D flip-flop using a manual clock As you learned in lecture, the D ( data ) flip-flop is a simple memory element. In this experiment you understand its properties using a manual clock you will provide yourself with a toggle switch. Each 74LS175 chip packages four D flip-flops: 74LS175 chip Power D D In In In In D D Ground Clock 4 D flip-flops Notice the notch and dot at the top of the chip you ll use these to orient the chip correctly on the breadboard. In lecture, we learned about the airlock or master-slave version of the D flip-flop (see slides of Lecture 12). This kind of flip-flop captures its input when the clock signal becomes 1 (the so-called rising edge of the clock) but changes the output only when the clock become 0 again (the falling edge). The D flip-flop in your kit does not have this airlock feature. Your flip-flop also captures the input on the rising edge, but makes it available on the output immediately. The output can change on rising edges only, and at no other times. Connect the upper-right pin to power (the + column on the breadboard) and connect the lower-left pin to ground (the column). The lower-right pin receives a clock signal which drives all four flip-flops. Each flip-flop has a single input and two outputs; one output is the regular output value and the other, written with an overbar in the diagram above, is the opposite (i.e., negation) of the output value. 1. Disconnect power by unplugging the red power supply wire from the breadboard. COS 116 Lab 6 2

3 2. Insert the, resistor, and 74LS175 (D flip-flop) chip into the right half of the breadboard, as shown in the picture below. Make sure the U-shaped notch in the 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. a. Connect the output of Switch 1 to the input of one of the D flip-flops on the chip. b. The manual clock is implemented by toggling Switch 4, but this output is passed through another chip (74LS279), which was prewired into your breadboard. (See the questions at the end for the reason for this extra chip.) Connect the output of the 74LS279 as shown below to the clock input on the D flip-flop. c. Connect the output of the D flip-flop to the. 1 Jumper wires Resistor 3. Reconnect the power supply to the board. 4. Test your circuit. Provide a clock signal by flipping Switch 4 back and forth. Each time you turn Switch 4 on, the flip-flop updates its output. The will light up depending upon whether or not Switch 1 (connected to the flipflop s input) was ON at the instant of the rising edge of the clock signal. Now we will study timing diagrams, which describe the behavior of sequential circuits. The diagram below shows two time-varying signals (waveforms). Your goal is to figure out how to toggle Switch 1 and Switch 4 so as to enter these two waveforms into the D flip-flop. Keep track of time using either your wristwatch or the clock on your PC. Very precise timing is unimportant so long as you get the order of switch flips right. In your lab report mention in what sequence you toggled COS 116 Lab 6 3

4 the two switches, and at what times the turned on and off. Infer the output waveform using these observations, sketch it in your report and explain it in terms of the properties of the D flip-flop. (If you ever lose track of where you are in the signal, unplug power from the circuit and start over. Both plots begin with the voltage 0, which means that both switches are at the zero position.) You should sketch the output diagram and understand it completely before moving on to the next experiment. 5V 0V Time/s Switch 4 5V 0V Time/s Switch 1 In your report, also describe what the output waveform would be if we had used the airlock version of the D flip-flop? Recall that, in an airlock flip-flop, the input is captured on the rising edge, but is only available on the output on the falling edge. Part 2: Using a signal generator In real applications, of course, flip-flops are driven by a clock signal. We use a signal generator to generate our clock waveform. You will also see a simple example of a sequential circuit that uses its own output as an input. You should pair up with a neighbor for this experiment. 1. Disconnect power by unplugging the red power supply wire from the breadboard. Remove the wire going from the flip-flop to the, and make sure Switch 4 is turned off. Also, remove the wire connecting the output of Switch 4 to the Clock input of the D flip-flops. COS 116 Lab 6 4

5 2. Get a signal generator from your TA. Make sure it is powered on. Turn the wheels on it to set it to output a 1 Hz signal (1 clock cycle per second). The signal generators have probes coming out of them with a red and a black crocodile clip. Attach a little wire to each crocodile clip and insert the wire from the black clip to some blue column on the breadboard. 3. Connect the red crocodile clip to the input of the. 4. Using a wristwatch, count the number of times the turns on/off in 10 seconds and use this to infer the frequency of the waveform that is being fed into the. In your report write down this frequency. 5. Disconnect the signal generator s red crocodile clip from the. Replace the wire you had taken out in step Remove the wire connecting Switch 1 to the D flip-flop and use it to instead connect pin 3 and 4 of the 74LS175 IC. This connects the input of the flipflop to the opposite (or negation) of its output. Your circuit should look like the figure below except for the oscilloscope, which will be added in the next experiment. 7. Now connect the red crocodile clip from the signal generator to the CLOCK pin of the D flip-flop. Observe the and again estimate the frequency of the waveform being applied to it. In your report mention this frequency and explain it in a line or two. Jumper wires Signal Gen Oscilloscope Resistor Part 3: Observing fast voltage signals using the oscilloscope Now we will use a digital oscilloscope to visualize these waveforms on a PC. Since, most real sequential circuits, like a computer s control unit, operate at very high COS 116 Lab 6 5

6 frequency clock signals we want to test our circuit with such a clock signal. In this experiment, we will run the previous circuit at higher clock frequencies. The output frequency will consequently be very high as well, and so an cannot be used to visualize it. Hence we will use an oscilloscope to visualize the output. 1. Make sure the oscilloscope is connected to the computer. Next open the oscilloscope program EasyScope II for DS1M12. Set the TimeBase T/Div dial to 50ms. This sets the horizontal axis in the oscilloscope display to 50 ms per major division. Also, set the Volts/Div Dial to 1.0. This sets the scale of the vertical axis to 1 V per major division. Next drag the vertical offset, the small yellow arrow to the left of the graph, as shown below. This makes 0 V appear at that height. Press Run. The screen should look like the one below. 2. The oscilloscope has a probe similar to the one that the signal generator had. Connect the black crocodile clip to ground (any blue column). Connect the red crocodile clip to the input of the in the circuit you built for experiment 2. Note that this is the output of the D flip-flop. (Make sure not to remove any connections made in part 2. Use an additional piece of wire to connect the input of the to the red clip as in the figure above.) 3. Now increase the frequency in the signal generator from 1 Hz to 20 Hz. COS 116 Lab 6 6

7 4. Sketch the waveform in your write-up. What is the amplitude and period of the output signal? Recall that the period of a signal is the length of time it takes to complete one cycle. You can play around with higher frequencies. You will have to adjust the TimeBase dial appropriately to visualize the resulting waveform. Part 4: Building Synchronous Sequential Circuits In this experiment you implement a simple synchronous circuit for a simple traffic light. The light has to behave as follows over and over: green for 2 clock cycles, yellow for 1 clock cycle, and red for 1 clock cycle. This behavior can be realized using a finite state machine with four states. We need two bits for representing 4 states. Since each flip flop can store 1 bit, you will need to use 2 flip-flops for this experiment. Call the flip flops 1 and 2. We recommend the following state assignments: Green1 = 11 Green2 = 01 Yellow = 00 Red = 10 The FSM cycles through these states. See the transition diagram below. Notice that this FSM has no inputs (i.e. the transition arrows are not labeled). Green1 (11) Green2 (01) 1 Red (10) 1 Yellow (00) 1. Fill in the state transition table of this FSM. The first row is filled out for you. CurrentState1 and CurrentState2 are the two bits of the current state. NextState1 and NextState2 are the two bits of the next state. The output bits are the signals that turn the three s on/off. COS 116 Lab 6 7

9 3. This question explores the need for the extra chip that your breadboard came with today. Its purpose is to debounce the switch output. Our switches use mechanical contacts and a spring, so when you flip a switch, the output oscillates (bounces) a bit before settling down. When you connect the output of the switch to an oscilloscope, you will see something like the following. [The details of the oscillation are different for different types of switches.] Explain why were the oscillations not a problem with combinational circuits used in the last lab, but a major problem with sequential circuits used today? 4. (Extra credit) The extra chip is an R-S latch which also appeared in the lecture on Mar 16. Examine the chip debouncing circuit and explain how it works. COS 116 Lab 6 9

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