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randomize() with
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This construct allows the declaration of inline constraints at the point where the randomize() class method is called. These additional constraints are of the same constraint types and forms as would otherwise be declared in the randomized class. The inline constraints are applied along with the object constraints. The original constraints in the class definition does not have to be changed. |
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Syntax |
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inline_constraint _declaration ::=
class_variable_identifier . randomize [
( [ variable_identifier_list | null ] ) ]
with constraint_block
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Where |
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- class_variable_identifier : Is the name of the instantiated object.
- The unnamed constraint_block contains additional in-line constraints to be applied along with the object constraints declared in the class.
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Example : randomize with
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1 program randomize_with;
2 class frame_t;
3 rand bit [7:0] src_addr;
4 rand bit [7:0] dst_addr;
5 constraint c {
6 src_addr <= 127;
7 dst_addr >= 128;
8 }
9 task print();
10 begin
11 $write("Source address %2x\n",src_addr);
12 $write("Destination address %2x\n",dst_addr);
13 end
14 endtask
15 endclass
16
17
18 initial begin
19 frame_t frame = new();
20 integer i = 0;
21 $write("-------------------------------\n");
22 $write("Randomize Value\n");
23 i = frame.randomize();
24 frame.print();
25 $write("-------------------------------\n");
26 $write("Randomize with Value\n");
27 i = frame.randomize() with {
28 src_addr > 100;
29 dst_addr < 130;
30 dst_addr > 128;
31 };
32 frame.print();
33 $write("-------------------------------\n");
34 end
35 endprogram
You could download file randomize_with.sv here
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Simulation Output : randomize with
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-------------------------------
Randomize Value
Source address 02
Destination address ab
-------------------------------
Randomize with Value
Source address 79
Destination address 81
-------------------------------
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Copyright © 1998-2014 |
Deepak Kumar Tala - All rights reserved |
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Do you have any Comment? mail me at:deepak@asic-world.com
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