In reply to ben@SystemVerilog.us:
Thanks Ben for pointing out the file
tb_src/reg_slice_xactn.svh
and some example driver code.
To start with understanding BFM driver,
I’m reading this website that shows 4 use models of a driver
and some simple UVM driver code.
http://www.learnuvmverification.com/index.php/2015/10/03/uvm-driver-use-models-part-2/