# Math Help - how to get the value of GFILog (FF)

1. ## how to get the value of GFILog (FF)

Hi,
I need to implement Galois Field division in my application.
Please follow the link for the reference http://www.xilinx.com/support/docume...es/xapp865.pdf.
In this document GFILog (FF) and GFLog(00) is not defined.

Please suggest me how can I calculate the value of these?

Thanks
Madan

2. ## Re: how to get the value of GFILog (FF)

it looks like we are in GF16 (judging from the fact that the LUT's are 15x15), so the field in question is:

$\frac{\mathbb{Z}_2[x]}{(x^8 + x^4 + x^3 + x^2 + 1)}$

i think you might find a more detailed answer here:

http://web.eecs.utk.edu/~plank/plank.../CS-96-332.pdf