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DS90UB960-Q1: query for making Frame sync different des ICs

Minwoo Song
Intellectual 990 points
Part Number: DS90UB960-Q1

Hi TI,

now I am checking to make below system : 

could you check and answer applicable method for this ? 

* example system : 

- I wanna use des IC only 2 : 960 x1ea + 940 x1ea 

- 1st camera 1.5M@60hz  * 2ea <-- 960 input 1,2

- 2nd camera 1.2M@30hz * 2ea <-- 960 input 3,4

- 3rd camera 1.5M@60hz + 1.2M@30hz (each 1ea) <-- 940 input 1,2 

- using internal frame sync generator in 960 (internal fsync mode), and send it to 940 (External fsync mode)   

q1) I use different resolution and hz in 960 for frame sync, 

in 960, for framesync, can I use and receive from ser to des by this different images from camera  ? 

q2) for the system that I send the fsync of 960 to 940 gpio, is it possible configuration in framesync condition ? 

q3) in 960, between internal fsync mode and external fsync mode,

can I use only one method for fsync mode ? 

for example, I can't use this operation ? ("in 960, 1.5M@60hz x2 input by internal fsync + 1.2M@30hz x2 input by external fsync) 

Thanks

  • 0
    TI__Mastermind 18755 points

    Hello,

    1.) Are you asking if you can generate different framesync signals from the 960 to send to the different cameras.  If so, the 960 has one framesync generator and cannot generate multiple framesync signals.  if the signals are being generated externally then you can map them through the different back channel GPIOs.

    2.) Are you asking if you can change the signal?

    3.) this is possible.  You can map different BC GPIOs to internal framesync and external framesync in registers 0x6E and 0x6F.

    Regards,

    Nick

  • 0 in reply to Nicholas Darash
    Intellectual 990 points

    Hi Nick,

    Very thanks for your answer. 

    there is one more question : 

    I want to make the frame sync system for different (resolution, hz) images. 

    I just wonder how can I make it and it is possible or not ., 

    q4)  when 960 make internal frame sync, and I want to send the fsync from 960 (generated by internally) to 940,

    if 940 use external frame sync, can the 940 change its frames sync period to half ? (1/2 or 1/3 or 1/4 ... et al..) 

    in other words, "in 960, it uses 1.5M@60hz x2 input by internal fsync +  in 940,it uses 1.2M@30hz x2 input by external fsync" 

    can 'the different des 960 and 940' use same frame sync (by 960) ? 

    if not, I think, I can consider for the additional work to make half of frame sync of 940. 

  • 0 in reply to Minwoo Song
    TI__Mastermind 18755 points

    Hello,

    This doesn't sound like it will work.  You have different resolutions and frame rates here this will require separate frame rate generators.  Also the 960 can output the internally generated framesync across the channel to the serialzier GPIOs but it cannot output the framesync signal on the local GPIOs.

    Regards,

    Nick

  • 0 in reply to Nicholas Darash
    Intellectual 990 points

    Hi Nick,

    Very thanks for your check. 

    I will make the system for TI's guidance, 

    and here I send more questions. 

    q5) is there any example system for making different frame sync system ? 

    q6) how about below system ? 

    If I find out 'external timing generator IC', and I can make different timing sync (1 for 60hz, 2 for 30hz) 

    does it work well with TI des 960 and 940 ? 

     

    Thanks

  • 0 in reply to Nicholas Darash
    Intellectual 990 points

    Here I send additional question : 

    q7) for your answer "but it cannot output the framesync signal on the local GPIOs."  <-- is it correct ? 

    I found the GPIO setting registers in datasheet. for example, 0x16, 0x17 register shows the GPIO_SRC and 

    there is the description. "100 : Frame sync signal" and I think, when I set 0x16 = 100, it means that

    'I want to use GPIO6_OUT for frame sync port (inernally generated)" <-- I wonder My understand is right or not. 

  • 0 in reply to Minwoo Song
    TI__Expert 5480 points

    Hello, 

    5. I'm not sure what you mean by example of different frame sync examples. 

    6. Yes that should work fine. You will need the external generator to send different frame sync signals to the GPIO's of the 940/960 and they can send it to the camera using BC GPIO. 

    7. You can probe the GPIO you are sending frame sync out on and you should be able to see the signal on the 960 for internally generate frame sync; however the example you showed above is using external frame sync. For external frame sync the GPIO, you cannot bring that signal out locally on the DES. 

    Thanks, 

    Sally