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TDA4VM: query for TDA4 CSI configuration and usage

Minwoo Song
Intellectual 990 points

Part Number: TDA4VM

Hi Ti,

I have several questions for TDA4 processor.

q1) for each CSI channel, can I use (2+1+1 Lane) or (2+2 Lane) configuration ? 

q2) I searched the datasheet but each CSI channel has only 1 csi clock for the channel. 

if I use 2+2 lane, how can I use the different clock for each 2 lane ? 

q3) if (2+2 Lane) configuration is possible, into each 2 lane, images of different resolution and hz come in, 

can TDA4 store each image to DRAM ? and does user use image cropping inside ? 

Thanks,

  • 0
    TI__Expert 5615 points

    Hi Minwoo,

    TDA4VM has 2 CSIRX ports. Each port has its own DPHY which can work in 1/2/4 lane/s configuration. Each port can only one clock.

    You cannot have multiple lane configurations for the same CSIRX port like you cannot have (2+1+1 or 2+2). You can have different lane configurations for the two CSIRX ports e.g. one CSIRX port can work in 4 lane configuration while another one can be in 2 lane mode.

    You can receive multiple channels with different resolutions and frame rates onto the same CSIRX port.  

    I hope this answers all your queries.

    Thanks & Regards,
    Vivek Dhande.

    Texas Instruments (India) Pvt Ltd

  • 0 in reply to Vivek Dhande
    Intellectual 990 points

    Hi Vivek Dhande,

    Thanks for your answer. 

    I understand that I can't use multiple MIPI configuration except only 4 Lane. 

    and then, there is one more question

    q) if I use virtual channel through MIPI input in TDA4, can I send 2~4 different images into DRAM of TDA4 ? 

    Regards, 

  • 0 in reply to Minwoo Song
    TI__Genius 13870 points

    Hello,

    Minwoo Song said:
    q) if I use virtual channel through MIPI input in TDA4, can I send 2~4 different images into DRAM of TDA4 ? 

    Yes, just keep in mind that YUV420 has a limitation that you cannot interleave. You must send the entire frame.

    thanks,

    Alex

     

  • 0 in reply to Alex Bashkov
    Intellectual 990 points

     Hi Alex,

    I have a question for "Yes, just keep in mind that YUV420 has a limitation that you cannot interleave. You must send the entire frame."

    what is the meaning of YU420 limitation for interleave ? 

    do you mean the YUV 420 1-planar (1-plane) except 2 or 3-plane ? 

  • 0 in reply to Minwoo Song
    TI__Genius 13870 points

    Yes, you must send the entire frame, cannot interleave YUV420.

    thanks,

    Alex