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open-fpga-verilog-tutorial
Learn how to design digital systems and synthesize them into an FPGA using only opensource tools
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InfluxDB
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The toolchain is called Icestorm, main tool is yosys, most information will be in English. I started with this tutorials here (also in English) https://github.com/Obijuan/open-fpga-verilog-tutorial. Then I used books to learn more on the basics of cpu design in verilog (which can also found online). Obijuan is a Spanish profesor teaching digital electronics in university, he lead the development of a graphical user interface to generate verilog based on a blocks UI, which helps design circuits when you are starting, but unfortunately I believe all his videos are in Spanish, I'd suggest you give it a try even if you don't understand English, as the material available (wiki and videos) is very good. Look for "fpgawars jedi academy " and IceStudio (the tool). But in the end, I personally felt limited by the GUI tool (which was still under heavy development at the time) and went straight to code the verilog code by hand (which obviously is more flexible). Anyway I feel there are not that many pattern to know.