In reply to raj@123:
class a;
parameter N = 10; //no of slaves
rand int unsigned add[N];
constraint unique_add { unique{add};}
// if needed end address take another array of same size and add parameter(no of bytes) to the add array and use start and end address
endclass
module tb;
a a1;
initial
begin
a1 = new;
a1.randomize;
$display("%p",a1.add);
end
endmodule