Meek_rj45_ethernet

hi:

I wanna to use RJ45 on NEEK,I have read the triple speed ethernet.pdf, and collect some information about TSE.In hardware part,I refer the design download from altera,name is "niosii-ethernet-standard-3c25",from the project I know the architecture of using TSE,but I meet some trouble in software aspect:

1:I have read the triple speed ethernet.pdf several times, I wanna to begin with realizing a simple fuction ,such as the loopback fuction,but I donnt know how to write MAC frame,can somebody tell me what exactly I need to do,including which registers to care about(can I use HAL directly according to triple_speed_ethernet_regs.h, and not refer to LWIP/interniche or something)

thanks