Circuits--Combinational--Basic Gates_1

1.Wire

module top_module (
    input in,
    output out);

    wire w;
    assign w=in;
    assign out=w;
endmodule

2.GND

module top_module (
    output out);
    
   assign out=1'b0;

endmodule

3.NOR

module top_module (
    input in1,
    input in2,
    output out);
    
    assign out=~(in1|in2);

endmodule

4.Another gate

module top_module (
    input in1,
    input in2,
    output out);
    
    assign out=in1&(~in2);

endmodule

5.Two gates

module top_module (
    input in1,
    input in2,
    input in3,
    output out);
    
    assign out=in3^(~(in1^in2));

endmodule