logarithm to the basis 2

Altera_Forum · ‎07-21-2011

Hi,

is there a way to calculate the logarithm to the basis 2 of a generic parameter? I don't need a synthesizeable circuit. I just want the compiler to to calculate an integer and asign it to another generic parameter of a submodule.

Thanks!

Sören

Altera_Forum · ‎07-21-2011

In VHDL:

function log2 (x : positive) 
	return natural 
	is 
	begin
		if x = 1 then
			return 0 ;
		else
			return log2(x / 2) + 1;
		end if;
	end function log2 ;

Altera_Forum · ‎07-21-2011

Many thanks!