3-to-8 Binary Decoder

The entity decoder_3to8 has a selector (i_sel) of type std_logic_vector(2 downto 0), an enable (i_en) of type std_logic, and an output (o_q) of type std_logic_vector(7 downto 0).

When i_en is '1', the output is one-hot encoded: "000"->"00000001", "001"->"00000010", ..., "111"->"10000000". When i_en is '0', the output is "00000000".