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Video latency in AM3517, how to calculate/measure

Other Parts Discussed in Thread: AM3517

Hi,

 

I'm working with a system where an AM3517 receives audio data through the VPFE (from a decoder) and uses the display driver to display the video on the screen.

There are requirements with regards to delay in the system, and I would like to know what the AM3517's contribution to this is. I couldn't really find the answers in the technical documentation, but I am not sure what to look for. Any suggestions?

Alternatively: Are there an easy way to measure the latency of the system?

 

  • I believe you meant Video above (typo mistake).

    I am quite not sure, and could not able to make out from your question above is, what exactly is the requirement? When you delay, what is it? Before commenting anything further I need to understand the use-case here.

    From VPFE perspective, it can work in both Master and slave to the pixel clock, HSYNC and VSYNC.

    Thanks,

    Vaibhav

  • Thanks for the answer. Yes, it's video :)

    I can only describe the use case in general terms: The system has a screen which shows live video from a camera. Since the signal goes through chain of operation there will be some delay:

    • Receiving data through VPFE
    • Copying data to RAM? Or does it coincide with reception? (DMA)
    • Converting from YCbCr to RGB
    • Scaling
    • Transmit video data to display

    This is just for the AM3517, and there are som other stages in the chain as well. I was trying to gte an idea of how much time it would take for the video data to be processed, but I couldn't find information intended for this purpose.