VHDL Component Declaration
The following VHDL component declaration is located in the VHDL Design File (.vhd) Definition ALTERA_PRIMITIVES_COMPONENTS.VHD located in the <Intel® Quartus® Prime installation directory>\libraries\vhdl\altera directory.
COMPONENT DFF
   PORT (d   : IN STD_LOGIC;
        clk  : IN STD_LOGIC;
        clrn : IN STD_LOGIC;
        prn  : IN STD_LOGIC;
        q    : OUT STD_LOGIC );
END COMPONENT;