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DM8147 Address Offset -- 16 Bytes on each frame

We are using the Link API directly, not McFW.  We are using ipcFrameIn to move data from the VPSS processor to the A8 processor.  When we check the physical address of each frame in memory, the address of each frame ends in 0x??????90.  When we look in the memory, the data appears to originate at 0x??????80.  The data appears to be offset by 16 bytes.  Does anyone know why this might happen?  Has anyone seen this?