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Dynamic arrays are fast and variable size is possible with a call to new () function. In dynamic size array :
- Similar to fixed size arrays but size can be given in the run time
- Dynamic arrays can have only single dimention and it can not be packed
- Out of bound error in dynamic arrays causes run time error.
01.module example;
02.
03.reg [31:0] regArray_1[];
04.reg [31:0] regArray_2[];
05.reg [31:0] regArray_3[];
06.reg [31:0] regArray_[];
07.
08.int i;
09.
10.initial
11.begin
12.regArray_1 = new [5];
13.regArray_3 = new [3];
14.regArray_ = new [10];
15.
16.// initialize values for regArray_1
17.for ( i = 0 ; i < regArray_1.size(); i ++ )
18.regArray_1[i] = i;
19.
20.// copy regArray_1 to regArray_2
21.regArray_2 = new[regArray_1.size()] (regArray_1);
22.
23.// initialize values for regArray_3
24.for ( i = 0 ; i < regArray_2.size(); i ++ )
25.$display ("%d: %d \n" , i, regArray_2[i]);
26.
27.$display ("regArray_3");
28.for ( i = 0 ; i < regArray_3.size(); i ++ )
29.$display ("%d: %d \n" , i, regArray_3[i]);
30.
31.// Display the result of the transformation
32.$display ("Transformed regArray_1, with reduced size");
33.for ( i = 0 ; i < regArray_1.size(); i ++ )
34.$display ("%d: %d \n" , i, regArray_1[i]);
35.
36.// copying 'regArray_' to 'regArray_1'.
37.regArray_1 = new[10](regArray_);
38.$display ("regArray_");
39.for ( i = 0 ; i < regArray_.size(); i ++ )
40.$display ("%d: %d \n" , i, regArray_[i]);
41.
42.// Display the result of the transformation
43.$display ("Transformed regArray_1, with increased size");
44.for ( i = 0 ; i < regArray_1.size(); i ++ )
45.$display ("%d: %d \n" , i, regArray_1[i]);
46.
47.regArray_1.delete(); // Deleting the elements of regArray_1
48.// Display the size of the array after deletion
49.$display ("Size of the regArray_1 after deletion = %d",
50.regArray_1.size());
51.
52.#100 $finish;
53.end
54.endmodule
Output :
01.# Copy of old regArray_1
02.# 0: 0
03.#
04.# 1: 1
05.#
06.# 2: 2
07.#
08.# 3: 3
09.#
10.# 4: 4
11.#
12.# regArray_3
13.# 0: 1
14.#
15.# 1: 1
16.#
17.# 2: 1
18.#
19.# Transformed regArray_1, with reduced size
20.# 0: 1
21.#
22.# 1: 1
23.#
24.# 2: 1
25.#
26.# 3: x
27.#
28.# 4: x
29.#
30.# 5: x
31.#
32.# 6: x
33.#
34.# 7: x
35.#
36.# 8: x
37.#
38.# 9: x
39.#
40.# regArray_
41.# 0: 0
42.#
43.# 1: 0
44.#
45.# 2: 0
46.# 2: 0
47.#
48.# 3: 0
49.#
50.# 4: 0
51.#
52.# 5: 0
53.#
54.# 6: 0
55.#
56.# 7: 0
57.#
58.# 8: 0
59.#
60.# 9: 0
61.#
62.# Transformed regArray_1, with increased size
63.# 0: 0
64.#
65.# 1: 0
66.#
67.# 2: 0
68.#
69.# 3: 0
70.#
71.# 4: 0
72.#
73.# 5: 0
74.#
75.# 6: 0
76.#
77.# 7: 0
78.#
79.# 8: 0
80.#
81.# 9: 0
82.#
