DMA

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Regards,

I&#39;m a beginner with DMA and I&#39;m working with Nios I. I&#39;m just doing this little test: reading data from external sram (a block of 64 positions) and writing it in a fifo (my user logic). My fifo is connected with Avalon in this way:

FIFO --> AVALON SIGNAL

----------------------------------

ena --> chipselect } for writing

data -->writedata

wrreq --> write

rdreq --> read

clock --> clk

aclr --> reset

q --> readdata

full --> export } it turns on a led

The only problem is the first address of fifo, because when I read the data (with the traditional method, without DMA) written before with DMA, I get a zero in the first position (0) the first time I run the program. The next times, I get the value that it&#39;s supposed to be in the last position (63).

I&#39;m using nr_dma_copy_range_to_1.

Any help?

Thanks a lot!