Entered digital high frequency to the FPGA could not be detected OK

Hello

We want to connect the CMOS camera with PCIe-7842R with SCB68 box to analyze the image in the FPGA. There are PCLK (pixel clock) signal (36 MHz) and 8 bits of data.

On the 1st, we write a test program to ensure that we can detect the PCLK correct which is attached as program.png. The program is very simple there is a loop timed with 80 MHz, which should be enough take 36 MHz signal. If the value of 8000 "Digital 2", we should have 3600 (+ -1) like "digital." The reason why we (+ -1) is that we have no synchronization, is supported in this test program. And we can get the right result in this configuration.

2nd part, connect us data to 8-bit on FPGA and we get a wrong result of PCLK. Even connect us only 1 bit (which is labeled as DIO1 program) data, the PCLK is disturbed, and we can't find out why. The configuration of the connector is attached as connector.jpg.

We tried to make 2 very distant digital signals, but are still not. We tried to change the cables connected between SCB68 and FPGA of SHC68-68-RDIO cable for SHC68-68-RMIO cable because we think she may have better armor. We have a better result but still bad.

Now, we put "Digital 2" 8000 and we have about 3400 ~ 3500 as 'digital."which is false.

Does anyone have advice or commands on this problem? I'm very appreciate your kind help.

Thank you.


Tags: NI Hardware

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