A D flip-flop is a circuit that stores a bit and is updated periodically, at the (usually) positive edge of a clock signal.
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D flip-flops are created by the logic synthesizer when a clocked always block is used (See alwaysblock2). A D flip-flop is the simplest form of "blob of combinational logic followed by a flip-flop" where the combinational logic portion is just a wire.文章来源：https://www.toymoban.com/news/detail-646714.html
Create a single D flip-flop.文章来源地址https://www.toymoban.com/news/detail-646714.html
module top_module (
input clk, // Clocks are used in sequential circuits
input d,
output reg q );//
always@(posedge clk) begin
q<=d;
end
// Use a clocked always block
// copy d to q at every positive edge of clk
// Clocked always blocks should use non-blocking assignments
endmodule
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