MCQ Practice Question

Digital Electronics LFSR & Sequence Generators

Why is the all-zero state normally excluded from an XOR-feedback LFSR sequence?

AIt can become a locked state that continues producing zeros
BIt causes the supply voltage to double
CIt automatically changes to all ones
DIt destroys the clock generator

Correct Answer: A. It can become a locked state that continues producing zeros

Explanation: With XOR feedback, an all-zero register generally produces zero feedback, so every subsequent state remains all zero unless external logic forces the LFSR out of that state.

Reference: Standard digital electronics: LFSR lock state