NDFC_ST
const uint32_t status = NAND_READ(sc, NDFC_ST);
status = NAND_READ(sc, NDFC_ST);
NAND_WRITE(sc, NDFC_ST, NDFC_ST_CMD_INT_FLAG);
status = NAND_READ(sc, NDFC_ST) & NDFC_ST_INT_MASK;
NAND_WRITE(sc, NDFC_ST, status);