1位的与非门

代码： 

`timescale 1ns/10ps
module nand_gate(
A,
B,
Y);

input A;
input B;
output Y;

assign Y=~(A&B);

endmodule

//testbench

module nand_gate_tb;
reg A;
reg B;
wire Y;

nand_gate nand_gate(
				.A(A),
				.B(B),
				.Y(Y)
				);
				
initial begin 
				A<=0;B<=0;
		#10		A<=0;B<=1;
		#10		A<=1;B<=0;
		#10		A<=1;B<=1;
		#10		A<=0;B<=0;
		#10		$stop;
end

endmodule

实验波形

 4位的与非门

代码：

`timescale 1ns/10ps
module nand_gate_4bits(
A,
B,
Y);

input[3:0] A;
input[3:0] B;
output[3:0] Y;

assign Y=~(A&B);

endmodule

//testbench

module nand_gate_4bits_tb;
reg[3:0] A;
reg[3:0] B;
wire[3:0] Y;

nand_gate_4bits nand_gate_4bits(
				.A(A),
				.B(B),
				.Y(Y)
				);
				
initial begin 
				A<=4'b0000;B<=4'b0000;
		#10		A<=4'b0000;B<=4'b0001;
		#10		A<=4'b0001;B<=4'b0010;
		#10		A<=4'b1011;B<=4'b0011;
		#10		A<=4'b1001;B<=4'b1011;
		#10		A<=4'b1101;B<=4'b1001;
		#10		A<=4'b0101;B<=4'b1010;
		#10		A<=4'b0111;B<=4'b0011;
		#10		$stop;
end

endmodule

实验波形 

小结