The AXI DataMover core optionally supports the Data Realignment Engine (DRE). When the DRE is enabled, data is realigned to the byte (8 bits) level on the Memory Map datapath (up to 512-bit).
If the DRE is enabled, data reads can start from any Address byte offset. Similarly, when the DRE is enabled, the writes can happen at any byte offset address. For example, if Memory Map Data Width = 32, data is aligned if it is located at address offsets of 0x0, 0x4, 0x8, 0xC, etc. Data is unaligned if it is located at address offsets of 0x1, 0x2, 0x3 and so forth.
Note: Performing unaligned transfers when DRE is disabled will give unpredictable results.