XHCI_TRB_3_IOC_BIT
td->td_trb[x-1].dwTrb3 |= htole32(XHCI_TRB_3_IOC_BIT);
XHCI_TRB_3_CYCLE_BIT | XHCI_TRB_3_IOC_BIT |
trb_link->dwTrb3 = htole32(XHCI_TRB_3_IOC_BIT |