Vending machine

this is my ROM code

library IEEE;

use IEEE.STD_LOGIC_1164.all;

use IEEE.NUMERIC_STD.all;

entity ROM_Venda is

port(address : in std_logic_vector(1 downto 0);

dataOut : out std_logic_vector(7 downto 0));

end ROM_Venda;

architecture RTL of ROM_Venda is

subtype TDataWord is std_logic_vector(7 downto 0);

type TROM is array(0 to 3) of TDataWord;

constant c_memory: TROM := (0 =>"00000000", 1 =>"01010000", 2=>"01100100", 3=> "01111000"); -- Produto 1 ->80 Produto 2 ->100 Produto 3 ->120

begin

process (address)

begin

case address is

when "00" =>

dataOut <= c_memory(0);

when "01" =>

dataOut <= c_memory(1);

when "10" =>

dataOut <= c_memory(2);

when "11" =>

dataOut <= c_memory(3);

end case;

end process;

end RTL;