DDR config tool (S32DS vision )& calibration results.

[nxf51397]

I am trying to get get read/write delay calibration for EVB2 board.

I am following the first method showed in:

HOWTO: Use DDR Configuration and Validation Tool (S32DS for Vision) 

At the end of validation stage, read/write delay calibration results are always 64. is this expected behavior? How can I get the best ones?