SK_STAT_BMU_FIFOIWM
sk_win_write_1(sc, SK_STAT_BMU_FIFOIWM, 0x07);
sk_win_write_1(sc, SK_STAT_BMU_FIFOIWM, 0x04);
sk_win_write_1(sc, SK_STAT_BMU_FIFOIWM, 0x10);