What is the meaning of input and output of LFSR's primitive polynomial?

[rlagusrb24]

Hi.

I'm studying about LFSR recently, but there is some problem.



This is 3-bit LFSR and my book said that this circuit is expressed by primitive polynomial of p=y^3+y+1

I thought that Y3's value is y and next Y3's value is p. But after I have calculated it, I saw it was wrong.

So, I have substituted each Y1 to Y3 values to y but it doesn't shows any relative value to Y1 to Y3.

What is p and y's actual meaning in LFSR? Is it related to any value of each DFF's output?

 

[FvM]

The polynomial specifies the feedback taps.

A brief explanation how to read the polynomial https://en.wikipedia.org/wiki/Linear-feedback_shift_register#Fibonacci_LFSRs