Likewise, because the register has a finite number of possible states, it must eventually enter a repeating cycle. The initial value of the LFSR is called the seed, and because the operation of the register is deterministic, the stream of values produced by the register is completely determined by its current (or previous) state. Thus, an LFSR is most often a shift register whose input bit is driven by the XOR of some bits of the overall shift register value. The most commonly used linear function of single bits is exclusive-or (XOR). In computing, a linear-feedback shift register ( LFSR) is a shift register whose input bit is a linear function of its previous state. JSTOR ( March 2009) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: 'Linear-feedback shift register' – news Please help improve this article by adding citations to reliable sources.
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