Camera Link image, line, data valid bit locations

Hi all

(see also http://forums.ni.com/t5/Machine-Vision/How-can-I-know-if-the-PCIe-1433-sees-a-Frame-Valid/td-p/31769...)

I'm trying to re-design code FPGA vendor to change a camera of 4 x 12 Medium to Full 8 x 8.

The Camera Link standard is quite confusing. The way I read it, a Camera Link of 8 x 8 Full camera should affect the valid as follows:

LVAL: bit 24 on three channels

FVAL: bit 25 of the three channels

DVAL: bit 26 on three channels

For some reason, the provider asigned them like this (and IT WORKS!):

LVAL: bit 18 on three channels

FVAL: bit 19 in all three channels

DVAL: bit 20 of three channels

There is another format that corresponds to the valid Bit arrangement? If so, is there something in the Camera File Generator and. Files of CIM which defines the format?

See you soon!

Crazy

Crazy,

Yes, you are right the LVAL, FVAL and DVAL are on TX/RX24, 25 and 26 respectively.  These assignments of bits match with parallel interfaces on Channel Link Serializer/Deserializer chips.  The PCIe-1433 expect that framing signals are mapped to the signals to the camera.

Not all cameras output a signal DVAL, so they can be ignored in the acquisition card (PCIe-1433) with a camera file parameter.  In addition, the polarity of the signals framing can be reversed with a camera file affecting as well.

You may be interested in using Camera Link Logger with the PCIe-1433 to receive signals from the camera.   Camera link Analyzer will present the traffic camera link in a format easy to read Visual format that can help your development and debugging.

http://www.NI.com/product-documentation/14301/en/

Regards, Jeff

Tags: NI Hardware

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