static int ehci_state_fetchsitd(EHCIState *ehci, int async)
{
    uint32_t entry;
    EHCIsitd sitd;

    assert(!async);
    entry = ehci_get_fetch_addr(ehci, async);

    if (get_dwords(ehci, NLPTR_GET(entry), (uint32_t *)&sitd,
                   sizeof(EHCIsitd) >> 2) < 0) {
        return 0;
    }
    ehci_trace_sitd(ehci, entry, &sitd);

    if (!(sitd.results & SITD_RESULTS_ACTIVE)) {
        /* siTD is not active, nothing to do */;
    } else {
        /* TODO: split transfers are not implemented */
        fprintf(stderr, "WARNING: Skipping active siTD\n");
    }

    ehci_set_fetch_addr(ehci, async, sitd.next);
    ehci_set_state(ehci, async, EST_FETCHENTRY);
    return 1;
}

static int ehci_state_fetchsitd(EHCIState *ehci, int async)
{
    uint32_t entry;
    EHCIsitd sitd;

    assert(!async);
    entry = ehci_get_fetch_addr(ehci, async);

    if (get_dwords(ehci, NLPTR_GET(entry), (uint32_t *)&sitd,
                   sizeof(EHCIsitd) >> 2) < 0) {
        return 0;
    }
    ehci_trace_sitd(ehci, entry, &sitd);

    if (!(sitd.results & SITD_RESULTS_ACTIVE)) {
        /* siTD is not active, nothing to do */;
    } else {
        /* TODO: split transfers are not implemented */
        fprintf(stderr, "WARNING: Skipping active siTD\n");
    }

    ehci_set_fetch_addr(ehci, async, sitd.next);
    ehci_set_state(ehci, async, EST_FETCHENTRY);
    return 1;
}
