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DS90UB940N-Q1: Does it support 2 Lane different input and integrate into 1 lane output

Zirui Su
Expert 5340 points
Part Number: DS90UB940N-Q1

Hi

I would like to ask a question that when we use 941AS-Q1 pairing with 940N, could we use them like the figure below:

941AS-Q1 output 2 different video stream signal and could 940N integrate them into one lane data stream to output?( LANE 0 and LANE 1 are different video stream but they have the identical resolution and bandwidth, could it be feasible? I have saw the datasheet of 940N and see some configuration with mode selection but did not see the 2-lane input and 1 lane output mode. Besides, what does the 'LP11' mean? Thank you!

  • 0
    TI__Mastermind 19720 points

    Hi,

    Can you give me a block diagram of what you are trying to accomplish? Do you want one video stream to come out CSI port 0 lane 0 and the other video stream out of CSI port 0 lane 1? 

    LP11 or LP-11 stands for Low Power state 11 it is defined in the DPHY spec and means that both Dp and Dn DPHY lanes are high. This puts means that no data will be sent on these lanes unless the sequence to exit LP-11 is sent.

    Regards,

    Michael W.

  • 0 in reply to Michael.Walker
    TI__Expert 5340 points

    Hi

    Customer would like 2 lane inputs with different video streams and output only 1 lane, does 940N support this? 

  • 0 in reply to Zirui Su
    TI__Guru** 103215 points

    Hello Zirui,

    Yes this can work. It would basically be dual FPD-Link mode between 941AS and 940. Your input source on the 941AS side would need to provide one consolidated image with two different video feeds (identical resolution, timing and frame rate). So to the 941AS or 940N this will just look like one image, not two. It would be sent out into one CSI-2 port with up to 4 lanes and the format of the total image (which actually contains two images) would be whatever format you gave it from the 941AS side. 

    On the 941AS side you can achieve this in two different ways:

    1. The 941AS can get one DSI input which contains two images. This could be in various formats such as 3D side by side, alternating pixel, or alternating line 

    2. The 941AS can get two DSI inputs and then perform a merge in either alternating pixel format or 3D side by side format. 

    Best Regards,

    Casey