How to padd number of zeros to the front of the randomized data

SystemVerilog
,
1

hi,
i have data signal which need to be randomized for which i need to padd the number of zeros.
rand [31:0] data;
example: number of zeros to be padded to data is 5 so that my data look like data = 32’b00000111101110101011101101110001

2

If you mean you need to pad the MSBs with a certain amount of zeros, you can shift right in post_randomize()

data >>= shift_r;

You can also to the shift as part of the constraint by adding an extra random variable.

rand bit [31:0] data, temp;
rand int shift_r;

constraint c {
  shift_r inside {[0:5]};
  data == (temp >> shift_r);
}