2-to-4 Binary Decoder

The entity decodeur_2vers4 has a selector (i_sel) of type std_logic_vector(1 downto 0), an enable signal (i_en) of type std_logic, and an output (o_q) of type std_logic_vector(3 downto 0).

When i_en is '1', the output is one-hot encoded: "00" -> "0001", "01" -> "0010", "10" -> "0100", "11" -> "1000". When i_en is '0', the output is "0000".