GetField
#define GetTD_alen(u, td) GetField((u), (td), dw2, 0, 11)
#define GetTD_status(u, td) GetField((u), (td), dw2, 16, 8)
#define GetTD_ioc(u, td) GetField((u), (td), dw2, 24, 1)
#define GetTD_iso(u, td) GetField((u), (td), dw2, 25, 1)
#define GetTD_ls(u, td) GetField((u), (td), dw2, 26, 1)
#define GetTD_c_err(u, td) GetField((u), (td), dw2, 27, 2)
#define GetTD_spd(u, td) GetField((u), (td), dw2, 29, 1)
#define GetTD_PID(u, td) GetField((u), (td), dw3, 0, 8)
#define GetTD_devaddr(u, td) GetField((u), (td), dw3, 8, 7)
#define GetTD_endpt(u, td) GetField((u), (td), dw3, 15, 4)
#define GetTD_dtogg(u, td) GetField((u), (td), dw3, 19, 1)
#define GetTD_mlen(u, td) GetField((u), (td), dw3, 21, 11)