CTRL_TFCE
if (sc->sc_ctrl & CTRL_TFCE)
sc->sc_ctrl &= ~(CTRL_TFCE | CTRL_RFCE);
sc->sc_ctrl |= CTRL_TFCE;
if (CSR_READ(sc, WMREG_CTRL) & CTRL_TFCE)
if (ctrl & CTRL_TFCE)