tslot_delay
void tslot_delay(struct tslot_softc *sc, unsigned int ms);
tslot_delay(td->td_parent, 300);
tslot_delay(td->td_parent, 300 + 100);
tslot_delay(td->td_parent, 100 + 20);
tslot_delay(td->td_parent, 20);