To Generate values for array

SystemVerilog
,
1

write a code to generate an array of size 12 with {​ 0,0,0,1,1,1,0,0,0,1,1,1 }​

2

In reply to Subbi Reddy:


  bit ary[] = '{0,0,0,1,1,1,0,0,0,1,1,1};
3

In reply to cgales:

need to generate values using constraints to the array

4

In reply to Subbi Reddy:

Your original question didn’t state that requirement. Please ensure that your questions are sufficiently stated so that an answer which meets your requirements can be provided.


class array_class;
  rand bit ary[];
  
  function new();
  endfunction
  
endclass

module testbench();
  array_class my_array_class;
  
  initial begin
    my_array_class = new();
    if (!my_array_class.randomize() with {ary.size == 12;
                                          ary[ 0] == 1; ary[ 1] == 1; ary[ 2] == 1;
                                          ary[ 3] == 0; ary[ 4] == 0; ary[ 5] == 0;
                                          ary[ 6] == 1; ary[ 7] == 1; ary[ 8] == 1;
                                          ary[ 9] == 0; ary[10] == 0; ary[11] == 0;
                                         })
      $display("Randomization failure");
  end
endmodule
5

please confirm,The below is correct for generic purpose?

`define MAX_ELEMENTS 12
`define COL_ELEMENTS 3
class array_class;
  rand bit ary[][];
 
  function new();
  endfunction
  constraint arr_p { ary.size == (`MAX_ELEMENTS /`COL_ELEMENTS);
                   foreach(ary[i]) {
                   ary[i].size ==3;
                   
                  
                     foreach(ary[i][j]) {
                       if(i%2==0)
                     ary[i][j]==0;
                  else
                    ary[i][j]==1;
                     }
                     }
}
                       
endclass
 
module testbench();
  array_class my_array_class;
 
  initial begin
    my_array_class = new();
    my_array_class.randomize();
    $display("%p",my_array_class.ary);
  end
endmodule
6

In reply to Subbi Reddy:

Please use code tags making your code easier to read. I have added them for you.

We don’t know what your requirements are, so no one can tell you if it is correct or not.

7

In reply to dave_59:

In reply to Subbi Reddy:
Please use code tags making your code easier to read. I have added them for you.
We don’t know what your requirements are, so no one can tell you if it is correct or not.

I will follow from next time onwards.

Thank you @dave_59

8

In reply to Subbi Reddy:

I’m I to assume that for each nth row if n is odd, all the elements in that row are 1 and 0 if n is even?

9

In reply to Shashank Gurijala:

And, with 4 rows and 3 columns?

10

In reply to Subbi Reddy:

Requirement is not very clear. I am assuming that requirement is to randomize 1-D array and repeat 1 and 0 in fixed order.


class arr_val#(MAX_ELEMENT=12, REPEAT_ELEMENT=3);

  rand bit arr[MAX_ELEMENT];

  constraint val_c {
    foreach(arr[i]) { arr[i] == ((i/REPEAT_ELEMENT)%2); }
  }
endclass

module top();
  arr_val av=new();

  initial begin
    av.randomize();
    $display(av); 
  end

endmodule

/*
OUTPUT:
'{arr:'{'h0, 'h0, 'h0, 'h1, 'h1, 'h1, 'h0, 'h0, 'h0, 'h1, 'h1, 'h1} }
*/
11

In reply to Alokpati:

In reply to Subbi Reddy:
Requirement is not very clear. I am assuming that requirement is to randomize 1-D array and repeat 1 and 0 in fixed order.


class arr_val#(MAX_ELEMENT=12, REPEAT_ELEMENT=3);
rand bit arr[MAX_ELEMENT];
constraint val_c {
foreach(arr[i]) { arr[i] == ((i/REPEAT_ELEMENT)%2); }
}
endclass
module top();
arr_val av=new();
initial begin
av.randomize();
$display(av); 
end
endmodule
/*
OUTPUT:
'{arr:'{'h0, 'h0, 'h0, 'h1, 'h1, 'h1, 'h0, 'h0, 'h0, 'h1, 'h1, 'h1} }
*/

This Format also correct.