Udemy course with FPGA information
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VHDL is not a programming language, we writting a configuration file, writting or describing how do you want a physical digital circuit to run on the FPGA.
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VHDLvis not software, it is used to describe the hardware tghat software runs on. So if you have a processor you would write VHDL to describe the processor and then you can write software that you can run on that processor.
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When VHDL is synthesized the compiler runs through the code and constructs the gates specified in the VHDL code and implements them onto the targeted logic device.