CPRE 583 Reconfigurable Computing (Tools overview)

1. CPRE 583Reconfigurable Computing(Tools overview) Instructor: Dr. Phillip Jones (phjones@iastate.edu) Reconfigurable Computing Laboratory Iowa State University Ames, Iowa, USA http://class.ece.iastate.edu/cpre583/

2. Outline • NX: For remotely accessing Linux machines from off campus • Very basic Linux • Some on-line tutorials and quick reference cards • http://trinity.senecac.on.ca/cadence-tutorial/Unix.pdf • http://www.fsid.cvut.cz/cz/U201/linux.html • https://www.cfa.harvard.edu/~jbattat/computer/linuxReferenceCard.pdf • Creating a new ISE project • Running simulation from within ISE • Generating a bitfile • Downloading a bitfile to the FPGA board (impact)

3. NX • NX is an application that allows you to access Linux machines from off campus. • It is very lightweight and can be typically installed in less than 5 minutes • You can download NX from the following links • For Windows: http://www.nomachine.com/download-client-windows.php • For Linux: http://www.nomachine.com/download-client-linux.php • For MAC OS: http://www.nomachine.com/download-client-macosx.php • For Solaris: http://www.nomachine.com/download-client-solaris.php • After you install the NX client, make sure to install any additional fonts that are available for your platform type. If you do not some application will not display properly • You can login to the following ISU Linux machines using your userID & password • Those listed here: http://www.it.eng.iastate.edu/remote • Note: These machine do NOT have access to FPGA hardware • xilnx-1, xilinx-2, xilinx-3.ece.iastate.edu • Note 1: the xilinx machines should only be used when testing a circuit using the FPGA hardware. • Note 2: the xilinx machines are primarily for distance students to test hardware. On campus students should use a machine in Coover 2050

4. Very basic Linux • How to unpack a .zip or .tar.gz file • .zip • unzip my_file.zip • .tar.gz • gunzip my_file.gz.tar • tar -xvf my_file.tar • How do I know where I am • pwd (tells you your current location, use this command often) • What is in my current location • ls (list all the files and directors at this location) • Changing directories • cd directory_name • cd .. (takes you up one directory level) • cd ~ (takes you to your home directory) • Making a new directory • mkdir new_directory_name

5. Creating a new ISE project • cd to where you want to make a directory for your project • mkdir the directory for you project • cd into the directory you made • pwd to check that you are indeed in that directory • source ./Xilinx_12_4_src.txt • This command tells the computer where to find the tools (e.g. ise). You must run this command any time you open a new Linux terminal. In this case, I’m assuming you are running the “source” command where your “Xilinx_12_4_src.txt” file is located. • start ise: ise & • Note: If you already have a project: iseproject_name.xise &

6. Creating a new ISE project Note you already have a project for the AND gate. Use these directions to get you going for the OR gate.

7. Creating a new ISE project

8. Creating a new ISE project Browse to the location of the directory you created

9. Creating a new ISE project Give your project a name

10. Creating a new ISE project • Make your setting match this • click Next

11. Creating a new ISE project You project summary should look something like this. Click finish

12. Creating a new ISE project You have no files! Here are your choices. Very rarely do I start a VHDL file from scratch. Lets create a new source files. Then use some existing VHDL to fill it. For example for the OR gate. Add new source files for the testbench and OR gate. Then copy/paste from the given AND example to get you going.

13. Creating a new ISE project Right click to pop up options

14. Creating a new ISE project Indicate you are Adding a VHDL file In this case we will add two source files. One for the testbench (AND_TB) to test the AND gate (AND_2bit).

15. Creating a new ISE project You can add the port names, direction and width here. Since we are going to copy VHDL source code form somewhere else we will skip this step. Note: This is a step for convince for when you do not have code to start from.

16. Creating a new ISE project

17. Creating a new ISE project The tool tries to be helpful by adding some VHDL for you. I would suggest deleting this and copying from the AND gate example, until you get more comfortable with the tools.

18. Creating a new ISE project Now let’s add a source file for the 2-bit AND gate component.

19. Creating a new ISE project

20. Creating a new ISE project

21. Creating a new ISE project

22. Creating a new ISE project You have some files Note: The Hierarchy window should show the strutural relationship between your files. At this point it shows AND_TB and AND_2bit at the same level

23. Creating a new ISE project The 2-bit AND gate is a subcomponent of AND_TB. After updating your VHDL files with the appropriating “entity” and “component” names. ISE will figure out the hierarchy.

24. Creating a new ISE project If you see a question mark, this could mean ISE lost track of your file when you were editing it. If your file is indeed in the project directory, then just tell ISE

25. Creating a new ISE project Remind ISE where it is Note: The “?” can also appear if you incorrectly named you entity in the VHDL

26. Creating a new ISE project

27. Simulating your design Set “View” to Simulation Select at what level you want to compile or simulate. In this case the whole design

28. Simulating your design Set simulation properties. For example how long to run for

29. Simulating your design For this case I’ve set the simulation to run for 1000 ns

30. Simulating your design Now simulate

31. Simulating your design Modelsim compiles your VHDL before simulating it. In this case it caught a syntax error. Missing semicolon

32. Simulating your design It looks like this version of ISE does syntax checking every time you save a file. So this error could have been caught earlier.

33. Simulating your design Now that you can run simulation. You need to add signals and dividers. Right click in the “Wave” window to Insert a Divider

34. Simulating your design 2 3 1 To add signals for the AND gate. 1) select it in “Instance”, this instance of the AND gate is called “my_dut”, 2) select the signals in the “Objects window, 3) Drag and drop the signals into the “Wave” window

35. Simulating your design Typically you will want ALL of your signal in “Hexadecimal”. To do this 1) select all of the signals, 2) right in wave window, 3) Radix->Hexadecimal

36. Simulating your design: Saving wave formats To keep from having to reformat you signals EVERY time for the same Design, save you wave format

37. Simulating your design: Saving wave formats For this project I have named the wave format HW1_3_a_AND_wave.do Next we will look at how to tell ISE to use this wave format when it launches Modelsim. Note: there are a number of ways of doing this, and even different versions of ISE support different methods. Often this is something you need to play around with and figure out yourself.

38. Simulating your design: Saving wave formats ISE file that will call your wave format Contents of your project directory Wave format you just created “cat” prints the contents of a file This is how I modified AND_TB_wave.fdo Tell ISE to only call your wave format file After you make this updates, restart Modelsim from ISE to see if it worked

39. Simulating your design: Saving datasets Some times you want to save the dataset (.wlf) for a simulation run. Often this is used to compare the behavior of one version of a design to another while debugging. And for this class you will save datasets so that I can review the behavior of your circuits without needed your source code.

40. Simulating your design: Saving datasets 1. Modelsim typically saves the current dataset as “vsim.wlf” 2. Rename it to the name you want. In this case HW1_2_a_AND_dat.wlf

41. Simulating your design: Loading Dataset • To check if your dataset saved correctly open Modelsim standalone (vsim &), and load the wave dataset (.wlf), and then the associated wave format

42. Simulating your design: Loading Datasets Open a wave window, then readjust/resize the windows of Modelsim

43. Simulating your design: Loading Datasets Find and open the dataset

44. Simulating your design: Loading Datasets 2 6 5 1 2 4 Find and open the dataset

45. Simulating your design: Loading Datasets Now load the wave format (.do) associated with this dataset

46. Simulating your design: Loading Datasets Browse to find the correct wave format (.do)

47. Simulating your design: Loading Datasets Your dataset and associated waveform should appear

48. Simulating your design: Useful Buttons Zoom mode (VERY useful!!) Zoom out Jump to previous or next signal value transition (VERY useful!!) Select mode Zoom in Zoom full Toggle between short and full signal names Useful Buttons in Modelsim

49. Generating a bitfile View can be set to simulation or Implementation. Implementation only shows those files that will go on the hardware. Simulation typically shows files that will be simulated and/or put on the hardware

50. Generating a bitfile Any source file that will only be simulated should have its properties set to reflect this. In this case AND_TB will be set to Simulation. And my_dut (AND_2bit) will be set to ALL (i.e. both simulation and implementation)