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But not what is happening inside the process.
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The idea is 'recursive programing'. This topic is usually covered in computer programming classes. Most of the time the teacher / professor will then continue to explain that you have to 'unroll' it using a for-loop construct to avoid stack-overflow and to minimize running-time, but in VHDL the compiler makes the nicest logic from it. Just take a look at the schematic in the RTL Viewer, then double up the number of entries, re-compile and look again at the RTL Viewer. You will appreciate what the 'recursive' action does.
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