ESDHC_TUNE_CTRL_STEP
min += ESDHC_TUNE_CTRL_STEP;
max = min + ESDHC_TUNE_CTRL_STEP;
max -= ESDHC_TUNE_CTRL_STEP;
max += ESDHC_TUNE_CTRL_STEP;
min = max + ESDHC_TUNE_CTRL_STEP;
