SD_ISTA_REG
ista = SDHC_READ(sc, SD_ISTA_REG);
SDHC_WRITE(sc, SD_ISTA_REG, ista);
SDHC_WRITE(sc, SD_ISTA_REG, SD_INT_CLEAR);
SDHC_WRITE(sc, SD_ISTA_REG, SD_INT_CLEAR);
SDHC_WRITE(sc, SD_ISTA_REG, sc->sc_intr_ista);
SDHC_WRITE(sc, SD_ISTA_REG, SD_INT_CLEAR);