ncr53c9x_cpb2stp
sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5);
sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5);
ti->period = ncr53c9x_cpb2stp(sc, p);
if (ncr53c9x_cpb2stp(sc, v) < period)
sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5);