Last time I talked about how I took the open source Verifla logic analyzer and modified it to have some extra features. As promised, this time I want to show it in action, so you can incorporate it into your own designs. The original code didn’t actually capture your data. Instead, it created a Verilog simulation that would produce identical outputs to your FPGA. If you were trying to do some black box simulation, that probably makes sense. I just wanted to view data, so I created a simple C program that generates a VCD file you can read with common tools like gtkwave. It is all on GitHub along with the original files, even though some of those are not updated to match the new code (notably, the PDF document and the examples).
If you have enough pins, of course, you can use an external logic analyzer. If you have enough free space on the FPGA, you could put something like SUMP or SUMP2 in your design which would be very flexible. However, since these analyzers are made to be configurable from the host computer, they probably have a lot of circuitry that will compete with yours for FPGA space. You configure Verifla at compile time which is not as convenient but lets it have a smaller footprint.
Gtkwave Github
Interactive VCD VCD files may be viewed as they are generated provided that they are written to a fifo (pipe) and are trampolined through shmidcat first (assume the simulator will normally generate outfile.vcd): mkfifo outfile.vcd cver myverilog.v & shmidcat outfile.vcd gtkwave v I myverilog.sav. Popular Alternatives to Wave VCD Viewer for Windows, Mac, Linux, Software as a Service (SaaS), Web and more. Explore apps like Wave VCD Viewer, all suggested and ranked by the AlternativeTo. Based wave viewer for Unix, Win32, and Mac OSX which reads LXT, LXT2, VZT, FST, and GHW files as well as standard Verilog VCD/EVCD files and allows.
Iverilog Gtkwave
Famous quotes containing the words list of the, list of and/or list: “ The advice of their elders to young men is very apt to be as unreal as a list of the hundred best books. —Oliver Wendell Holmes, Jr. (1841–1935) “ I made a list of things I have to remember and a list of things I want to forget, but I see they are the same list. ” —Linda Pastan (b.