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SystemVerilog
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  • Array Constraint

Array Constraint

SystemVerilog 4972
constraint randomization 29 #systemverilog #Arrays 43
sumit089
sumit089
Forum Access
5 posts
February 20, 2018 at 5:56 am

I want to randomize an multi dimension array in such a way that it should contain "unique" values. without using the "unique" keyword
How to write constraint for that ?

In the below example I want all the index have the unique value i.e. ary[0][0]=2,ary[0][1] =4, .....

for example

rand int ary[2][2];

constraint unique_value{
foreach(ary[i,j]) {
ary inside{1:4};
}

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sumit089
sumit089
Forum Access
5 posts
February 20, 2018 at 5:58 am

Please ignore the syntax error

Digeshkumar
Digeshkumar
Forum Access
14 posts
February 26, 2018 at 4:50 am

In reply to sumit089:

class arrays ;
  rand int array[4][4];
 
  constraint arr_c{
    foreach(array[i,j]) array[i][j] == i*4 + j;
  }
endclass
 
module test();
  arrays m_arrays;
 
  initial begin
    m_arrays = new();
    if(m_arrays.randomize())begin
    m_arrays.array.shuffle();
    foreach(m_arrays.array[i,j]) $display("Array[%0d][%0d]:%0d",i,j,m_arrays.array[i][j]);
    end
  end
 
endmodule
hima_s
hima_s
Full Access
7 posts
September 15, 2018 at 9:35 pm 

  constraint c_item {
    foreach(arry[i,j])
      arry[i][j] inside {[1:4]};
    foreach(arry[i,j])
      foreach(arry[k,l])
        if (i==k && j==l) arry[i][j]==arry[k][l];
    	else arry[i][j]!=arry[k][l]; 
 
  }
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