TCTRL_IPCSEN
sc->sc_tctrl &= ~(TCTRL_IPCSEN | TCTRL_TUCSEN | TCTRL_VLINS);
sc->sc_tctrl |= TCTRL_IPCSEN;
if (sc->sc_tctrl & (TCTRL_IPCSEN | TCTRL_TUCSEN | TCTRL_VLINS))
__SHIFTOUT(sc->sc_tctrl, TCTRL_IPCSEN),