IGS_DAC_PEL_WRITE_IDX
bus_space_write_1(iot, ioh, IGS_DAC_PEL_WRITE_IDX, 0);
bus_space_write_1(iot, ioh, IGS_DAC_PEL_WRITE_IDX, 1);
bus_space_write_1(t, h, IGS_DAC_PEL_WRITE_IDX, index);