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OPT8241-CDK-EVM: I got a problem to use OP_Data from J2 connector

Jake J
Prodigy 40 points

Part Number: OPT8241-CDK-EVM

Hello, I'd like to connect OPT8241-CDK-EVM to another HSDIO device

what i want is  control 9221 with FX2 and Voxel,  and only get the OP_Data, CLK(OP_CLK_OUT) and Sync signal(HD_BD_OUT) from J2 connector

However, when I connect EXT_OP_CLK_OUT (pin 6) or EXT_BD_OUT (pin19) to the HSDIO device, the Voxel is shut down and Output data has not printed.

How can I solve this problem? is there any more process to connect J2? 

  • 0
    TI__Expert 3495 points
    I am guessing you're trying to capture DVP signaling using HSDIO? First, please check to make sure logic level of OP_xxx port signals and HSDIO signals are compatible. Second, make sure HSDIO are configured as input. Thirdly, make sure your added HSDIO connection are well shielded and is very short, so it does not add loading to the signal line, which could cause propagation delay upset FX2 operation.
  • 0 in reply to Larry Li
    Prodigy 40 points

    Thank you for your advice

    I check first and second one already. so third one is suspicious

    you mean if the line connected to J2 and HSDIO is too long, then the clock signal to FX2 weakened? so the Voxel stops?

    I wonder if there are other things I can do besides reducing the line length

    and one more questions, why does Voxel stops only when i connect CLK and BD line to HSDIO?

    (Voxel works well when connect OP_DATA, FRM_VD_OUT or other output line)