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 srff
    port(
        s, r, clk, clrn, prn :  in  std_logic;
        q                    :  out std_logic);
end component;