PPT 슬라이드
Composite Data_types are groups of elements in the form of an array. ( Bit_vector and Std_logic_vector are pre-defined composite types.)
signal A_word : bit_vector (3 downto 0) := “0011” ;
This represents four “bit” elements grouped together into an array, there is no pre-defined LSB or MSB interpretation, therefore it is not read as 3, ‘3’, or “3”.