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The role of forward channel and back channel in FPD Link and clock

William Tu1
Prodigy 210 points

Hi all,

While I watch the ti training video, I had some questions from it.

1. Could you please explain me the role of forward channel and back channel in FPD Link?

2. Could you explain the difference between system clock and frame sync?

  • 0
    TI__Guru** 103215 points

    Hello William,

    The forward channel from serializer to deserializer carries high bandwidth video or sensor data, while the back channel is used to transfer lower bandwidth data like I2C, control, and GPO signals. 

    System clock refers to the reference clock for the deserializer. In synchronous mode, this REFCLK is also used to generate the back channel/forward channels signal rates for the attached serializers. Whereas frame sync is a optional signal which can be provided to each serializer to be output as a control signal to each imager which signals the start of an exposure for the sensor. That way in a multi-camera system, all the cameras can be triggered to capture a frame at the same time 

    Best Regards,

    Casey