We define the function named NextBit on it that returns a pseudo-random bit generated with the logic mentioned above. We define a struct holding LFSR with the mentioned three parameters - the number of bits in the register, the seed, and the position of the taps. Golang-based implementation of the above LFSR is as shown below. The above example is taken from the Computerphile's video on this same topic. Set the vacant leftmost bit with the output of the XOR operationĪfter all the above operations are completed, the set of bits in the LFSR becomes the current state and is then used to output the next random bit, thus continuing the cycle. Shift the bits of the register by one to the right When the output bit is one, the bits in the tap positions all flip (if they are 0, they become 1, and if they are 1, they become 0), and then the entire register is shifted to the right and the input bit becomes 1. XOR the output bit with the bit in the 1 st position (indexed at 0) from the right ECE 623 Presentation - LFSR 11 The effect: When the output bit is zero, all the bits in the register shift to the right unchanged, and the input bit becomes zero. The output bit will be the rightmost bit of the register, and the next state of the LFSR will be computed as the A linear feedback shift register (LFSR) is a shift register whose input bit is a linear function of its previous state. We build a simple 4 -bit LFSR with a seed value of 0b1001 and tap position of 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |