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Original question:

TDA4VM: DSS in TDM

TDA4VM: Switching Input/Output in DSS without using A72

Dinesh bharathi
Intellectual 751 points

Part Number: TDA4VM

Hi,

We have a stream of total 6 video outputs from VPAC and other processing cores which will be displayed on 4 displays based on the user preference. We want to achieve this switching using the DSS pipeline itself i.e without using the A72 core. We want to see the possibilities of if we could toggle between these 6 outputs to be given inputs for 4 our displays within some sort of DSS configuration. Can DSS be configured to Operate on TDM for input or something in that sense?

Regards,
Dinesh

  • 0
    TI__Guru**** 491815 points

    Hi Dinesh,

    No, DSS cannot do TDM in this way. Typically one pipeline is configured for one input and if you want to switch configuration, you can change few configurations at run time, but few needs to be done while pipeline is off. 

    So if you could provide more information about configuration across 6 video, it would be helpful.

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Intellectual 751 points

    Hi Brijesh,

    The configuration we would like to process is when the vehicle is running normally the main 4 displays will run show the regular stream of data captured from the cameras. Lets say the user chooses to go with surround view which is generated from a GPU, we would like to switch 1 or 2 of the display with these custom views. 
    But it has to happen on the fly, we cannot have a noticeable amount of gap between these configuration switching. 

    Also can you explain the possible ways of TDM in DSS?

    Regards,
    Dinesh

  • 0 in reply to Dinesh bharathi
    TI__Guru**** 491815 points

    Hi ,

    I think i had answered previously that DSS does not support TDM this way. This needs to be handled in the application domain.

    Regarding above scenario, as long as input resolution and format remain same between currently displaying frame and new frame from GPU, it can be easily changed, because this needs just application to switch to input from GPU. 

    But if there is change in resolution or format change, there is a possibility that it takes more time frame time period to update the registers for the new configurations.. 

    Regards,

    Brijesh