• State TI Thinks Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 3 answers
  • Subscribers 33 subscribers
  • Views 442 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

FrameSync usage - 913A + 954 combination

omar chakroun
Prodigy 225 points

Hi there,

i have a question that may be a dummy one but i'm relatively new in using TI FPD-LINK III solutions.

i'm currently using a third party component that incorporates ti 913A and ti 954 serializers on the emitter and receiver side respectively and i'm triggering a frameSync signal from 954 -> 913A through the BC. does the ti913A emits the frames when it receives this FrameSync signal or it just used as a reference for the synchronization and doesn't trigger any emission from the 913A? i'm asking this question because on the solution that i'm using, it's possible to trigger the emission based on the rising/falling edge of the framesync signal. i wanted to be sure that is the normal operation on the 913A or it is an additional feature that comes with the solution that i'm using,

thank you and best regards,

  • 0
    TI__Genius 11340 points

    Hi Omar,

    When you send an internally generated FrameSync, the 954 can sent it to the 913A GPIO. You can set the following on 954:

    • Des register 0x4C = Select RX0
    • Des register 0x6E = FrameSync signal sent to which GPIOs
    • Des registers 0x19 - 0x1C = Set FrameSync signal duty cycle
    • For default BC Freq of 50MHz, Frame period = 600 ns --> 27778 counts
    • For a 10% duty cycle, set high time & low time to 2778 (0x0ADA) & 25000 -> (0x61A8)
    • For a 50% duty cycle, set high time & low time to 13889 -> (0x3641)
    • Des register 0x18 = Set to 0x01 to enable FrameSync

    On the 913A, you can set it to output on the GPIOs.

    Best,

    Jiashow

  • 0 in reply to Jiashow Ho
    Prodigy 225 points

    Hi Jiashow,

    thank you for the reply but i know how to do it and tested it and it is working,

    my question is about the behavior of the 913A when it receives the frameSync signal; does it automatically send the frame or it uses the framesync just as a synchronization signal and doesn't output the frame?

    thank you,

    omar

  • 0 in reply to omar chakroun
    TI__Genius 11340 points

    Hi Omar,

    The 913A can output the framesync on one of its GPIOs. You will need to connect that GPIO to the imager's framesync signal.

    Best,

    Jiashow

  • 0 in reply to Jiashow Ho
    Prodigy 225 points

    Hi Jiashow,

    yes in my end it is already connected to the imager and i'm asking if in the case everything (framesync up to the imager) is connected does the imager automatically output a frame. it is just a question related to how it is supposed to work.

    thank you and best regards,

    Omar

  • 0 in reply to omar chakroun
    Prodigy 225 points

    Hi Jiashow,

    i think i found the response to my question here; 

    but i think that the information should be incorporated into the TI913A documentation about the usage of the FrameSync and how to propagate the signal through the FSIN on the imager side for multiple frames synchronization.

    "The Host processor can apply a common periodic synchronization pulse to all image sensors’ FSIN pin. In this mode, a new frame starts automatically whenever a raising edge of FSIN is detected. In case one sensor runs out of synchronization, the periodic pulse enforces the last video rows to skip."

    "Each image sensor (OV10640) supports frame sync control input on a dedicated FSIN pin. One FSIN trigger generated from the Deserializer is routed to all cameras ensuring the frames of each camera will start at the same time. Using this method, the cameras remain synchronized within ± one video row. Hence, the worst case delay will be about two lines."

  • 0 in reply to omar chakroun
    TI__Genius 11340 points

    Hi Omar,

    Thanks for providing this document. It contains some very useful information. The reason why our 913A collateral doesn't have this information is because this is more on the imager side. The serializer simply provides the FrameSync signal to the imager but each imager may be configured differently to receive the FrameSync signal.

    Best,

    Jiashow