10/20 行為模式

module AOI_4_Unit( y_out , x_in1 , x_in2 , x_in3 , x_in4 );
input x_in1 , x_in2 , x_in3 , x_in4;
output y_out;
reg y1 , y2 , y_out; (與結構模式的不同處)
always
begin
#1 y1 = x_in1 & x_in2;
#1 y2 = x_in3 & x_in4;
#1 y_out = y1 ^ y2;
end
endmodule