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DM648 VPORT Signals

hdp
Intellectual 330 points

My application is having problem capturing 30 fps of xga resolution video eventhough the VSYNC is at 30 Hz.

 

Could there be any other reasons why the application is not capturing 30 fps?

Is there a VPORT document that defines the relationship between the HSYNC, VSYNC, FID, and video data that the VPORT HW expects?

  • TI__Mastermind 41665 points

    hdp said:
    Could there be any other reasons why the application is not capturing 30 fps?

    Typically if there are performance issues where frames are being dropped by the driver as opposed to just not getting processed by the DSP software in time it would be due to bandwidth saturation on the external memory bus, if this is the case than tweaking the priority of the EDMAs servicing the video ports may help improve the performance.

    hdp said:
    Is there a VPORT document that defines the relationship between the HSYNC, VSYNC, FID, and video data that the VPORT HW expects?

    I think the best document for this sort of thing is SPRUEM1, in particular section 3.2.3. Though this applies to BT.656 mode it also is the same basic formatting that is used in the Y/C mode.