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axi_dmac: Add suport for 64 bit address width
New improvements for the ADI DMAC IP: 1)The capability to manually overwrite the DMA_AXI_ADDR_WIDTH(from GUI or from tcl) 2)DMA_AXI_ADDR_WIDTH attribute is now visible in the Vivado GUI: -"Auto mode": Automatically calculated by the core tcl files based on the existing attached address segments. -"Manual mode": Specify the desired dma_width between 32-64 bits. 3)Added two new debug registers that return higher part of the current source/destination address. Signed-off-by: Filip Gherman <Filip.Gherman@analog.com>
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