vdma access pattern

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>?

0 albertabeef over 10 years ago

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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