FE_FMV3
bus_space_write_1(iot, ioh, FE_FMV3, 0);
bus_space_write_1(iot, ioh, FE_FMV3, FE_FMV3_ENABLE_FLAG);
{ FE_FMV3, FE_FMV3_EXTRA_MASK, FE_FMV3_EXTRA_VALUE },