WX_B2BT
dv_id += WX_B2BT(tc);
((36 * (WX_B2BT(_max_frame_link) + WX_PFC_D + \
2 * WX_B2BT(_max_frame_tc))
(2 * (2 * WX_B2BT(_max_frame_tc) + (36 * WX_PCI_DELAY / 25) + 1))