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AM3352: DDR3 issue

Hello,

We are using 512MB DDR3 part from ISSI, IS43TR16256A-125KBLI. While DDR testing, we tried to write some data on the first two locations as shown below,

0x80000000         wr data 0xffffaaaa

0x80000004         wr data 0x5555bbbb

 The data when read back is given below,

0x80000000         rd data 0xaaaa0000

0x80000004         rd data 0xbbbbffff

0x80000008         rd data 0x00005555

We have observed  a shift of 16 bit of the data. Please let us know your views on this shift.