implement a custom full-rate PHY for DDR2 of burst length 8 using altdq_dqs

is it possible to implement a custom full-rate PHY for DDR2 of burst length 8 using altdq_dqs, altpll, altdll and altiobuf?

I see altdq_dqs support only burst 2 memory in the user guide, why?

how to config these megafunctions and connect them together? Any idea is ok, thanks