What is a linear feedback shift register?Ī linear feedback shift register(LFSR) is a shift register whose input bit is a linear function of its previous state. The most commonly used linear function of single bits is exclusive-or (XOR). What is a feedback register?įeedback register (feedback shift register) A shift register, generally consisting of several cells, in which the first cell has its input supplied by a combinational logic function of the parallel outputs of several cells and of a possible external input.Ī parallel linear-feedback shift register (LFSR) is a shift register whose input bit is a linear function of its previous state. The only linear function of single bits is xor, thus it is a shift register whose input bit is driven by the exclusive-or (xor) of some bits of the overall shift register value.Ī linear feedback shift register (LFSR) is a mathematical device that can be used to generate pseudorandom numbers. A linear feedback shift register (LFSR) is a shift register whose input bit is a linear function of its previous state.
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