Appendix E. Linear Feedback Shift Registers (LFSRs)

The ouroboros of the digital consciousness

The Ouroboros—a symbol of a serpent or dragon devouring its own tail and thereby forming a circle—has been employed by a variety of ancient cultures around the world to depict eternity or renewal.[1] The equivalent to the Ouroboros in the world of electronics would be the Linear Feedback Shift Register (LFSR),[2] in which the output from a standard shift register is cunningly manipulated and fed back into its input in such a way as to cause the function to endlessly cycle through a sequence of patterns.

1 Not to be confused with the Amphisbaena, a serpent in classical mythology having a head at each end and capable of moving in either direction. ...

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