Words are swapped after DMA transfer

Result:

First one third of DDR2 memory filled! 
Value of last written data at address 0xD500000 (offset 0x1500000) is 0x540001
First transfer successful! 
Content of DDR2 SDRAM(offset 0x0) after DMA operation 
Address 0xC000000: 1 
Address 0xC000004: 2
Address 0xC000008: 3
Address 0xC00000C: 4
Address 0xC000010: 5
Address 0xC000014: 6
Address 0xC000018: 7
Address 0xC00001C: 8
Second transfer successful!
Content of DDR2 SDRAM after DMA operation
Address 0xD500004: 1
Address 0xD500008: 2
Address 0xD50000C: 3
Address 0xD500010: 4
Address 0xD500014: 5
Address 0xD500018: 6
Address 0xD50001C: 7
Address 0xD500020: 8
Content of DDR2 SDRAM after DMA operation
Address 0xF000004: 540001
Address 0xF000008: 3
Address 0xF00000C: 2
Address 0xF000010: 5
Address 0xF000014: 4
Address 0xF000018: 7
Address 0xF00001C: 6
Address 0xF000020: 9