#File sistema.vhd

entity sistema is
    port(...)
end entity sistema;

architecture struct of sistema is

component decoder_c is
    port([...])
end component decoder_c;

begin

    dec: component decoder_c
        port map ([...]);

end architecture struct;

#File decoder.vhd

entity decoder is
    port([...])
end entity decoder;

architecture behav of decoder is
[...]
begin
[...]
end architecture behav;

architecture struct of decoder is
[...]
begin
[...]
end architecture behav;

#File configuration.vhd
-- Per usare l'architettura behav
configuration config of sistema is
    for struct
        for dec:decoder_c
            use entity work.decoder(behav);
        end for;
    end for;
end configuration config;

-- Per usare l'architettura struct
configuration config of sistema is
    for struct
        for dec:decoder_c
            use entity work.decoder(struct);
                for struct
                    for all: nand_port
                        use entity work.nand_porta(behav);
                    end for;

                    for all: inverter
                        use entity work.inv_porta(behav);
                    end for;

                    for all: and_inv_port
                        use entity work.and_inv_porta(behav);
                    end for;
                end for;
        end for;
    end for;
end configuration config;