1.2.6.P Board Game Counter: Digital
Project 1.2.7 Understanding Digital Design: The Random Number GeneratorIntroductionThe Random Number Generator will be your first exposure to a fully developed circuit design that includes an analog section, a digital combinational logic section, and a digital sequential logic section. Combinational logic and sequential logic are the basic building blocks of all digital electronics and the topics of study for the majority of this course.In this activity you will use the Circuit Design Software (CDS) to build and test the complete digital logic section of the Random Number Generator design.Equipment Circuit Design Software (CDS)ProcedureSince we learned how the digital electronics of the Random Number Generator worked by analyzing its sequential and combinational logic sections separately, we will construct and simulate the device the same way. We will begin with the combinational logic section.Using the Circuit Design Software (CDS), enter the combinational logic section of the Random Number Generator shown below. For testing purposes connect three switches for the inputs A, B, and C. Combinational Logic Section – Board Game CounterStart the simulation.Toggle the switches and complete the truth table shown below. ABCL1L2L3L4L5L6L7000001010011100101110111Did the outputs for the inputs 001 thru 110 display what was expected? If they didn’t, check your circuit to make sure that it was built correctly. Make any necessary corrections and repeat steps (a) and (b).Did the outputs for the inputs 000 and 111 make sense? Does it matter?Now that the combinational logic section is working, let’s construct and simulate the sequential logic section. Using the Circuit Design Software (CDS), enter the sequential logic section of the Random Number Generator shown below. For the initial analysis, we will use a switch to generate the signal CLOCK. Sequential Logic Section – Random Number GeneratorStart the simulation.Cycle the input CLOCK several times until the initial value is 001. Cycle the input CLOCK and record the value of the outputs A, B, and C in the table shown below. (Remember 1 Cycle = 2 Toggles of the switch)CLOCKABCInitial Values0011st Cycle2nd Cycle3rd Cycle4th Cycle5th Cycle6st Cycle7th CycleIs the counter counting as expected (see below)? If not, check your circuit to make sure that it was built correctly. Make any necessary corrections and repeat steps (a) and (b).Modify the circuit by replacing the input switch with a CLOCK_VOLTAGE set to 5 volts, 50% duty cycle @ 50 Hz (see below). The CLOCK_VOLTAGE will continuously toggle the input, causing the output to repeatedly cycle through the count 001 to 110.Sequential Logic Section – Random Number GeneratorStart the simulation. Observe the outputs A, B, and C. They should be cycling through the following pattern: Is the counter counting as expected? If not, check your circuit to make sure that it was built correctly. Make any necessary corrections and repeat steps (e) and (f).Finally, let’s connect the combinational and sequential logic sections together to complete the Random Number Generator.Using the combinational logic and sequential logic sections created in steps (1) and (2) enter the circuit shown below into the Circuit Design Software (CDS).Combinational & Sequential Logic Section – Random Number Generator Start the simulation. Observe the outputs L1, L2, L3, L4, L5, L6, and L7. They should be cycling through the following pattern: Are the outputs working as expected? If they are not, check your circuit to make sure that it was built correctly. Make any necessary corrections and repeat steps (b) and (c).ConclusionThe combinational logic used in the Random Number Generator was AOI logic. What are three gates that are used to implement AOI logic?On the 74LS74 D flip-flop, the CLK input has a small triangle. The PR (preset) and CLR (clear) inputs have a circle. What do these symbols mean?What is the primary characteristic that differentiates combinational and sequential logic? ................
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