Design and Implementation of PRBS Generator using VHDL

Abstract

Pseudo random binary sequence is essentially a random sequence of binary numbers. So PRBS generator is nothing but random binary number generator. It is ‘random’ in a sense that the value of an element of the sequence is independent of the values of any of the other elements. It is 'pseudo' because it is deterministic and after N elements it starts to repeat itself, unlike real random sequences.
The implementation of PRBS generator is based on the linear feedback shift register (LFSR). The PRBS generator produces a predefined sequence of 1's and 0's, with 1 and 0 occurring with the same probability. A sequence of consecutive n*(2^n -1) bits comprise one data pattern, and this pattern will repeat itself over time.