TSEC_REG_RCTRL
reg = TSEC_READ(sc, TSEC_REG_RCTRL);
TSEC_WRITE(sc, TSEC_REG_RCTRL, reg);
TSEC_WRITE(sc, TSEC_REG_RCTRL, 0);
flags = TSEC_READ(sc, TSEC_REG_RCTRL);
TSEC_WRITE(sc, TSEC_REG_RCTRL, flags);