The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
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1 The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL Comp 541 Digital Logic and Computer Design Spring 2012 Lab #2: Hierarchical Design & Verilog Practice Issued Fri. 1/27/12; Due Wed 2/1/12 (beginning of class) This lab assignment consists of several steps, each building upon the previous. Detailed instructions are provided, including screenshots of many of the steps. Verilog code is provided for almost all of the designs, but some portions of the code have been erased; in those cases, it is your task to complete and test your code carefully. Submission instructions are at the end. You will learn the following: Navigating the ISE development environment Designing a hierarchical system, with multiple module types Working with buses (multi-bit values) Verilog test fixtures and stimuli, including printing and monitoring Verilog simulation, including the graphical viewer Make a New Project Start the Project Navigator, and open the Lab 1 project if not already open. Make a copy by clicking File Copy Project (choose Lab2 as its name). Be sure the last two checkboxes are checked.
2 Double-click on the file lab1_part1 to open it. Save it under a new name: File Save as fulladder.v. Now right-click on lab1_part1.v and click Remove. Click Add Source (below New Source), and add the file fulladder.v to the project. (This seems unnecessarily long, but is the only way to rename a file in the project!) Within this file, rename your module name to fulladder.
3 Select Simulation view, and remove lab1_test (we will make a new test fixture in this lab). Now go back to Implementation view. (Now from the Windows explorer, you can delete the files lab_part1.v and lab1_test from the Lab2 folder.) For your reference, here is once again the circuit and Boolean equations for a Full Adder (from Comp411). A B Carry Logic C in C out = C in ( A B) + AB Sum = C in A B C out Sum Sum Logic Make sure the description of the module is exactly as follows. Note that we have added a signal X that computes A xor B, which is then shared by the sum logic and the carry logic.
4 Save the file fulladder.v. At this point, the hierarchy should look like this: Designing a 4-bit ripple-carry adder Let us now design a 4-bit ripple-carry adder by stringing together four full adders (FAs). The diagram of a 4- bit adder (again, from Comp411) is shown here for reference. The corresponding Verilog code is shown here, but portions of it have been obscured. Please fill in appropriately. (You do not need to add any extra lines of code; just fill in the missing details into what is provided.) Before you can enter this code, you will need to create a new source file. See the following screenshots for what to enter into the dialog boxes:
5 Create your own test fixture to test your 4-bit adder.
6 Designing an 8-bit ripple-carry adder Now we will design an 8-bit adder using two 4-bit adders. The procedure is very similar: create a new source file, and this time use adder8bit as the name for the module, and specify the ports as follows: Use the following code, and fill in the missing details. Once again, create your own test fixture to test your 8-bit adder.
7 Designing an 8-bit Adder-Subtractor Now you will design a circuit that can perform 8-bit additions as well as subtractions. That is, given A and B, the circuit will produce either the sum A+B, or the difference A-B, depending on whether the value of a Boolean input Subtract is 0 or 1, respectively. This circuit was also covered in Comp411, but is repeated here for reference. Once again, you will create a new source file, with the name add_sub_8bit.v, and the following ports: Note that there is no C in and no C out.
8 Use the following code, and fill in the missing pieces: Note that while the 8-bit adder has a carry out, the add_sub_8bit module does not send it out! Also, observe carefully what the carry in of the adder is connected to. Save the file, and take a look at the hierarchy; it should look exactly like this when you expand all the nodes:
9 Verilog Test Bench Create a new source file, and select Verilog Test Fixture as its type, and name it Lab2_test, as shown.
10 Download the code for the test fixture from the website (you can copy-and-paste it into the stub that the tool automatically creates for you). Carefully go through every line of the test bench, and make sure you understand it! Refer to the online Verilog reference linked from the class website. Verilog Simulation Change to Simulation view (instead of Implementation view), and click to select Lab2_test underneath, and then double-click Simulate Behavioral Model. The simulator ISim will launch, and the results should look like the picture below (click Zoom to Full View). Since it is hard to make sense of all the 0 s and 1 s, select all the signals under Name (use shift-select), rightclick, choose Radix, and select Signed Decimal.
![Click and drag ToBornottoB[7:0] into the Name column in the waveform window: Click Simulation Restart, and then Simulation Run All.](/docs-images/93/113155951/images/11-2.jpg "This time the value of ToBornottoB[7:0] is also displayed in the waveform window. Right-click ToBornottoB in the name column, and change its radix back to Binary.")
11 You should now see the simulation outputs in decimal. Look through them carefully to make sure they are correct. Now, let us display the bus ToBornottoB that is inside the add_sub_8bit module. Go to the left, select uut, and you will see the objects and wires inside it. Click and drag ToBornottoB[7:0] into the Name column in the waveform window: Click Simulation Restart, and then Simulation Run All. This time the value of ToBornottoB[7:0] is also displayed in the waveform window. Right-click ToBornottoB in the name column, and change its radix back to Binary. Also, change the radix of B back to Binary. Observe that they are identical for the first half of the simulation, and bitwise complements during the second half. This exercise showed you how to examine objects and wire that are not at the top level, but down the hierarchy. Also, observe that you can click at a particular time instant in the waveform window. The Value column is updated to show the values of all the signals at that time instant. There are also other buttons available for zooming in/out, skipping to next transition, etc. Why does the value of i appear as X for the first 5 ns?
12 Using Display and Monitor Commands Look at the bottom of the test fixture. You will see commands using $time, $timeformat, and $monitor. The $monitor command tells the simulator to print a message whenever any of its arguments (except for $time itself) changes value. The output appears in the horizontal panel at the bottom of the simulator. Please refer to the online Verilog reference website for details on these commands, and make sure you understand them well! You should also look into the $display and $write commands. What to submit: A screenshot of the ISim window clearly showing the final simulation result, i.e., with ToBornottoB[7:0]. The values of ToBornottoB[7:0] and B[7:0] should be shown in binary The values of Result[7:0], A[7:0], Subtract, and i should be shown as signed decimals. How to submit: Paper hardcopy by beginning of class on Wednesday, February 1 st.
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