flip-flop with VHDL (dataflow, structure, behavior)
1.Dflip-flop1.1structurelibraryIEEE;useIEEE.STD_LOGIC_1164.ALL;useIEEE.STD_LOGIC_ARITH.ALL;useIEEE.STD_LOGIC_UNSIGNED.ALL;entitydffstisPort(d,clk:inSTD_LOGIC;q,qb:inoutSTD_LOGIC);enddffst;architecture