Hi Chengshan,
3. Correct. The 2020.08 Axi4Responder_Transactor.vhd is intended to be a register access model and does not support bursting. As you noted, Axi4Memory.vhd, implements memory models and does support bursting. This is noted in the README.md at: https://github.com/osvvm/AXI4.
Do you need a transactor that supports bursting? It is on my long term goals – but there are numerous things ahead of it.
