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AM3715 DDR Tdqss Issue

echo tong
Prodigy 45 points
Other Parts Discussed in Thread: AM3715
We are using AM3715 and Micron MT46H64M32LFCX-6 WT:B in our board, 
For tDQSS of DDR, the spec requires 0.75~1.25 tCK, 
Inline image 2
Inline image 3
But what we measured is 15.2ns as in below diagram, which is about 2.5 tCK, 
Inline image 1
This out of spec parameter will make the tDSS can not meet the DDR spec requirement which is 0.2*tCK min, tDSH is about 1*tCK while tDSS is nearly 0 as in upper diagram.
What may this failure come from? Is there any suggestion to solve this issue? Thanks!