select vhdl code example

Example: select vhdl

library ieee;
use ieee.std_logic_1164.all;
 
entity ex_select is
end ex_select;
 
architecture behave of ex_select is
 
  signal r_Index   : integer := 2;
  signal w_One_Hot : std_logic_vector(3 downto 0);
   
begin
 
  with r_Index select
    w_One_Hot <= "0000" when 0,
                 "0001" when 1,
                 "0010" when 2,
                 "0100" when 3,
                 "1000" when 4,
                 "0000" when others;
   
end behave;