MUSB2_REG_INTRX
intrx = bus_space_read_2(sc->sc_iot, sc->sc_ioh, MUSB2_REG_INTRX);
bus_space_write_2(sc->sc_iot, sc->sc_ioh, MUSB2_REG_INTRX, intrx);
REGDECL(MUSB2_REG_INTRX, 0x0046),
intrx = RD2(sc, MUSB2_REG_INTRX);
WR2(sc, MUSB2_REG_INTRX, intrx);
rx_status |= UREAD2(sc, MUSB2_REG_INTRX);