The previous step is the hardware description language and the next step is the FPGA.
After learning the hardware description language (Verilog or VHDL), how to continue the FPGA.
There is no shortcut in the world, every step has to walk. Learning FPGA is also the case, on the basis of a hardware description language, you can learn the FPGA foundation.
Learning Module Division and the definition of the interface, you can refer to some examples of FPGA manufacturers design, find ways to achieve it again, learn some problem solving routines, the skills to deal with problems, know how to write a useful thing probably need some background knowledge.
Learn to implement some simple, elementary, commonly used protocols, such as UART,SPI,IIC, which will further exercise the ability to write state machines. As far as possible to write a better, more reusable, follow-up can be directly used.
Learning system architecture, which is the coordination between different modules, can also learn some complex protocol (TCP) or complex interface circuits (SDRAM, DDR, USB, etc.).
Write Testbench, and write simulation models to deepen the understanding of Verilog's grammar.
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The previous step is the hardware description language, the next is the FPGA