FPGA Project (VHDL floating and real number mathematical operations using Simulink MATLAB)

I need a vhdl program allowing FPGA to do aritmetic calculations with real values. For instance summing, substracting, dividing and multiplying 2 real number values as follows: (2.32 + 3.65; 2.32 - 3.65; 2.32/3.65 ; 2.32*3.65) I assume it suppose to be done using some toolbox on MATLAB ( System Generator Toolbox) This code should work on Xilinx Spartan 6. I want the code written simple and understandable with the comments for each line of code. I want also an explanation as a text file or report( english doesn't have to be perfect)