nand2/03_Sequential_Logic/DFF.v

/**
* Data-Flip-Flop
* out[t+1] = in[t]
*/

`default_nettype none
module DFF(
        input clk,
        input in,
        output reg out
);

    // No need to implement this chip
    // This chip is implemented in verilog using reg-variables
    // reg out;
    always @(posedge clk)
        if (in) out <= 1'b1;
        else out <= 1'b0;

endmodule