Use System verilog constraints to Divide data of N into chunks of M

 Problem Statement:

You need to come up with the system verilog class < sequence item > which can generate or divide a large size of data N into smaller pieces of equal size, these small sized chunks have to be multiple of 4 - M. Maximum size is 64 and minimum is 4.

The left over data if it does not sum up to N, can be added last which need not match M.

Solution:

class chunks;
  int unsigned c[$];
  parameter SIZE = 200;
  rand bit [6:0] s;
 
  constraint c_size {
    s%4 == 0;
  }
 
  function void post_randomize();
    int tmp;
    tmp = SIZE - (SIZE/s * s); // If chunks doesnot add up to SIZE, collect the difference
   
    for(int i=0; i < (SIZE/s);i++) c.push_back(s);
    if(tmp !=0) c.push_back(tmp); // If non zero tmp is observed, simply add to the queue.
     
   
  endfunction
 
  function void display();
    $display("Size selected:%0d",s);
    $display("Queue value:%p",c);
  endfunction: display
endclass
 
 
  module top;
    chunks cs;
   
    initial begin
      cs = new;
      void'(cs.randomize());
      cs.display();
    end
  endmodule