Honored ContributorHi,
I need to use the Floating-point numbers and i have to compile “fixed_generic_pkg.vhdl” and “fixed_generic_pkg-body.vhdl” first, i'm using Quartus II 9.0 (32-bit) Thank you very much
Honored ContributorAnd what is your question or problem ?
Honored ContributorI don't know how to make :confused:
Honored ContributorYou dont know how to make what? Do you already have these files or do you need to make them yourself?
Honored Contributorjust add them to your project or put the vhdl files in your project folder and they should be compiled ...
or dont you know how to use the package ? ;p however I dont know whether they are synthesizable because it's vhdl-2008Honored ContributorJust realised - the files you mention have nothing to do with floating point. They are fixed point.
Honored ContributorI have already downloaded them from here
http://www.eda-stds.org/vhdl-200x/vhdl-200x-ft/packages_old/ but i don't know how to use these packages in my own project Thank you very muchHonored ContributorThese are the IEEE fixed point packages. They define types and functions that make using fixed point numbers easier in VHDL. There is a similar floating point ppackage, but I wouldnt recommend using it for synthesis.
the fixed point packages mike life alot easier when perforimg mathmatical operations on fixed point:
signal A : ufxied(4 downto -3); --3 bits fractional
signal B : ufixed(4 downto -3); -3 bits fractional
signal AtB : ufixed(9 downto -6);
signal ApB : ufixed(5 downto -3)
process(clk)
begin
if rising_edge(clk) then
AtB <= A * B;
ApB <= A + B;
end if;
end process;
I would take the easy route and start using these: http://www.altera.com/literature/ug/ug_altfp_mfug.pdf?gsa_pos=7&wt.oss_r=1&wt.oss=float Like others have said are you sure you *need* floating point math hardware? In my own experience 80% of the people who think they need it can use fixed point instead.
