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vdma access pattern

Former Member

How do i change the access pattern in vdma module?
For instance, I have a 4x4 image:
0  1  2  3 
4  5  6  7
8  9 10 11
12 13 14 15

and I want to access the image in this order:
0 1  2      
4 5  6   ->  
8 9 10  

1  2  3 
5  6  7  ->
9 10 11 

4  5  6 
8  9 10  -> ...
12 13 14


Is there a way to do this>?

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    The Xilinx AXI Video DMA engine is completely programmable.

    Please refer to the documentation at the following web page:

       http://www.xilinx.com/products/intellectual-property/axi_video_dma.html#documentation

     

    When you define your video storage, you can define a super-set of the actual transferred video.

    For example, you can define the video storage to be 2048 rows(lines) X 2048 columns(pixels).

    Each of the video input and video output data paths an use a subset of this storage.

    For example,

    the VDMA can tranfer 1280 rows(lines) X 1920 columns(pixels) within the 2048X2048 storage.

    To accomplish this, you would set the following:

    - VSIZE = 1280

    - HSIZE = 1920

    - STRIDE = 2048

     

    For your example, you would set the following:

    - VSIZE = 3

    - HSIZE = 3

    - STRIDE = 4

    Hope this helps !

     

    Regards,

     

    Mario.

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  • 0

    The Xilinx AXI Video DMA engine is completely programmable.

    Please refer to the documentation at the following web page:

       http://www.xilinx.com/products/intellectual-property/axi_video_dma.html#documentation

     

    When you define your video storage, you can define a super-set of the actual transferred video.

    For example, you can define the video storage to be 2048 rows(lines) X 2048 columns(pixels).

    Each of the video input and video output data paths an use a subset of this storage.

    For example,

    the VDMA can tranfer 1280 rows(lines) X 1920 columns(pixels) within the 2048X2048 storage.

    To accomplish this, you would set the following:

    - VSIZE = 1280

    - HSIZE = 1920

    - STRIDE = 2048

     

    For your example, you would set the following:

    - VSIZE = 3

    - HSIZE = 3

    - STRIDE = 4

    Hope this helps !

     

    Regards,

     

    Mario.

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