Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Quartus Prime complete lack of real data type support?

Hi, I have a function (basicaly implements a LUT) something like the following: function integer gen_lut; input integer addr; localparam SOME_CONSTANT = 418.39; // Gets calc...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

I've found one possible workaround, how to round real data type down to nearest integer:

1) Create a constant function that will convert real to nearest integer (up or down): 

function integer rtoi;
    input integer x;
    
    
    begin
        rtoi = x;
    end
endfunction

2) Create a macro that will round real down to integer: 

`define FLOOR(x) ((rtoi(x) > x) ? rtoi(x) - 1 : rtoi(x))

3) Use the macro: 

localparam real R_TEST = 0.785398163 * SOME_CONSTANT;
integer floor_int = `FLOOR(R_TEST);

Best regards!