subtype csigned is signed((CBITS-1) downto 0);
--TODO: bei CBITS-1 gibts einen overflow :/
subtype cinteger is integer range -(2**(CBITS-2)) to ((2**(CBITS-2))-1);
+ function find_msb(a : csigned) return natural;
end package gen_pkg;
+package body gen_pkg is
+ function find_msb(a : csigned) return natural is
+ variable r : natural := 0;
+ variable count : boolean := true;
+ begin
+ for i in (CBITS-1) downto 0 loop
+ if count then
+ if a(i) = '1' then
+ count := false;
+ else
+ r := r+1;
+ end if;
+ else
+ null;
+ end if;
+ end loop;
+ return (CBITS - r);
+ end function find_msb;
+end package body gen_pkg;
+