PPT 슬라이드
type integer is range . . .
Type integer allows for flexible, readily intuitive quantities and values in our models. It is essential to specify the range of any object of type integer, otherwise the language requires that synthesis tools generate a minimum 32 bit implementation.
Type real allows us to utilize floating point values and operations in our models. Since the range of real numbers is unlimited, we declare our type with the intended range of real values. (Real Values are not synthesizable !)
signal A : integer range 0 to 7; signal B : integer range 15 downto 0 ;
type CAPACITY is range -25.0 to 25.0 ; signal Sig_1 : CAPACITY := 3.0 ;