I would like to find the array index with its highest value. Is it possible to simply use an vhdl-attribute therefore? If so, how?
TYPE x_Array IS ARRAY (0 TO 3) OF STD_LOGIC_VECTOR(2 DOWNTO 0);
SIGNAL y : x_Array;
Example:
x_Array(0) = "000"
x_Array(1) = "011"
x_Array(2) = "111"
x_Array(3) = "101"
index <= x_Array'high; -- is this correct or..?
Question: How can I get the index of 2 (x_Array(2) has the highest value (7)) in vhdl?
As written, your question doesn't make sense: a std_logic_vector needs an interpretation to even be considered as a number.
So let's assume you knew that and wrote the sensible
library ieee;
use ieee.numeric_std.all;
use ieee.std_logic_1164.all;
type x_array is array(integer range <>) of unsigned(2 downto 0);
signal y : x_array(0 to 3);
just write the function
function maxindex(a : x_array) return integer is
variable index : integer := 0;
unsigned foundmax : unsigned(2 downto 0) := (others => '0');
begin
for i in 0 to a'high loop
if a(i) > foundmax then
index := i;
foundmax := a(i);
end if;
end loop
return index;
end function;
And apply as necessary.
'HIGH. Or do you want to know the index of the element with the highest value? In which case, the answer is: no.