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LMH0341 output pattern

artem shatalov
Prodigy 20 points
Other Parts Discussed in Thread: LMH0341

Hi, Team. I'm trying to implement SDI design using LMH0341 and Xilinx FPGA with SERDES. The problem is that i doesn't have any sdi pattern generator, only hd-sdi camera. How can i see, that output data from serdes is correct?  Does LMH0341 have any internal pattern generator to verificate physical link? And other question is what LMH0341 transmit over LVDS channel without connected signal? Maybe this is K28.5, but in chipscope i see different symbol even after descrambling.

  • 0
    TI__Guru* 88875 points

    Greetings,

    LMH0341 + FPGA IP detects color bar and other patterns. Please refer to the FPGA IP documentation below for details. LMH0341 by itself is just a de-serializer and we must use the FPGA/IP to decode SDI video patterns. 

    http://www.ti.com/tool/broadcast_video_serdes_ip

    Regards,,nasser

  • 0
    TI__Expert 3050 points

    Hi Artem,

    Have you tried using the evaluation kit for the LMH0341, SDXILEVK? Although the evaluation module uses an older FPGA, the kit still allows you to test various SDI patterns and rates.

    It also provides you with reference code to ensure that you have implemented all the necessary features/functions to interface properly with the LMH0341.

    Mike Wolfe

    DPS APPS / SVA

  • 0 in reply to Mike Wolfe
    Prodigy 20 points

    Hi!

    I already solve the problem! The error was that i'm incorrect swap bytes in output 20-bit word from xilinx serdes. I have changed this and now sdi interface work well. Thanks for answers!