You can declare an array of real nets by specifying the upper and lower indexes of the range. And, each index must be a constant expression that evaluates to an integer value. For example:
wreal w[3:2]; // Declares w as a wreal array.
Similar to buses, a wreal array groups multiple real values into a single, indexible entity. The following example demonstrates the definition of a wreal array:
module ams_tb; wreal y[3:2]; sub_design d1(y); initial begin #10 $display("%f,%f",y[2],y[3]); endendmodule
module sub_design(r); output wreal r [1:0]; assign r[1] = 2.7182818; assign r[0] = 3.142818;endmodule
Assigning a Complete Array to Another Array
Direct assignment of a complete array to another array is currently not supported. Therefore, assignments have to be split on the scalar level as follows:
module foo(p,r); output wreal r [1:0]; input wreal p [1:0]; // this is currently not supported // assign r=p; assign r[0]=p[0]; assign r[1]=p[1];endmodule
Connecting Wire Vectors to Wreal Arrays
Wreal vectors have no useful meaning to them when considered as a single entity.
// wreal [7:0] r;// What would be the meaning of r as a whole?
However, wire vectors can be connected to wreal arrays, as shown in the following example.
module ams_tb; wreal y[3:2]; wire [1:0]x; //Internally, the wreal vector is converted into a wreal array of the same size foo f1 (x,y); sub_design d1 (x);
initial begin #10 $display("%f,%f",y[2],y[3]); endendmodule