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8. Start acquisition
The Rules for Setting Areas of Interest
Notes:
The rules are dictated by how image data is organized for transmission over the available
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CLHS data lanes.
The camera/XML will enforce these rules truncating entered values where necessary.
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1. Acquisition must be stopped to change the AOI configuration
2. 1-4 AOI's can be selected
3. Minimum width is 96 pixels per AOI
a. Minimum total of all AOI widths summed together must be at least = Number of CLHS lanes x
96 pixels
i. 7 lanes: 672 pixels (Normal Use)
ii. 4 lanes: 384 pixels (When using CX4 fiber cable modules)
4. Maximum width of all AOI widths summed together must be no more than = 16,384 + (3 x 96) = 16,672
a. There can be maximum 8k bytes per CLHS lane when using only 4 lanes, such as with a CX4 fiber
module. i.e.
i. 8192 pixels per lane can be supported when using 8 bit pixels
ii. 5,461 pixels per lane can be supported when using 12 bit pixels
5. AOI width step size is 32 pixels
6. The offset of each AOI may be 0 to (16,384 – 96 = 16,288)
a. Therefore overlapping AOI's are allowed
7. Offset and width for individual AOI's will "push" one another
a. e.g. if AOI has offset 0, width 16,384, and the offset is changed to 4096, then the width will be
"pushed" to 12,288.
b. AOI's only effect one another by limiting the maximum width
8. AOI's are concatenated together in numerical order and sent to the frame grabber starting at column
zero
9. "Extreme" differences in AOI width's will reduce the maximum line rate
a. e.g. If AOI #1 is 16,384 x 12 bit pixels and the other three AOI's are just 96 pixels then with a
seven lane CLHS cable the maximum line rate will be ~50.8 kHz
10. If the AOI count is reduced to less than the current AOI count, the AOI selector will be changed to the
largest of the new AOI count available
34 •
The Piranha XL XDR Camera
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