Your 4-bit LFSR should use the design below. In this paper, the authors propose a 32 bit linear feedback shift register which generates pseudo-random test patterns as the input bit is a linear function of its previous state. With careful construction, the pattern can be made to cycle through all possible combinations of bits (except for all 0s before repeating). 2.6.5 LFSR Terminal Counters Linear Feedback Shift Registers ( LFSR ) are also referred to as ' maximal count ' counters ( a counter that counts.

This results in the shift register producing a pseudo-random series of numbers. called 16 times in the main program to get the 16-bit shift register. The PRBS generator produces a predefined sequence of 1s and 0s, with 1 and 0. The implementation of PRBS generator is based on the linear feedback shift register (LFSR). Build a 4-bit linear-feedback shift register (LFSR).Īn LFSR is essentially a shift register where a few of the bits are set to the result of XOR-ing other bits in the register. 4.3 VHDL Code for D-flip flop 28 4.4 VHDL Code for PRBS 29.