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module dff_normal(
    input       rstn,
    input       clk,
    input       D,
    output reg  Q
 );

    always @(posedge clk or negedge rstn) begin
        if(!rstn) begin   //Q = 0 after reset effective
            Q <= 1'b0 ;
        end
        else begin
            Q <= D ;       //Q = D at posedge of clock
        end
    end

endmodule

module dff_assign(
    input       rstn,
    input       clk,
    input       D,
    output reg  Q
 );
 
    always @(posedge clk) begin
        Q <= D ;       //Q = D at posedge of clock
    end
 
    always @(negedge rstn) begin
        if(!rstn) begin
            assign Q = 1'b0 ; //change Q value when reset effective
        end
        else begin        //cancel the Q value overlay,
            deassign Q ;  //and Q remains 0-value until the coming of clock posedge
        end
    end
 
endmodule