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How can DM6431 output video information?

Anonymous
Anonymous

Hello,

 

I have some questions on video output of DM6431.

           

      

 

According to SPRS342c, DM6431 has VPFE but without VPBE. Therefore, is it still capable of output video information?

 

Putting the “video information” more clearly defined, is it capable of doing either, or several combination of the following tasks?

1.      Output continuous video frames, such as video playback

2.      Cannot do 1, but can output static images, such as an image gallery

3.      Cannot do 1 & 2, but can control simple screen (like LED, etc.) to display graphical and textual information, inasmuch as on those powerful TI scientific calculator.

 

If either 1, 2, 3 is possible, then how can that be implemented? Does an external display controller required?

 

What is the output functionality of DM6437, regarding all of the three tasks above? Is its VPBE capable of controlling video displays without external display controller?

 

 

Thanks,

Zheng

  • 0
    TI__Guru 64480 points

    Zheng,

    This is one of the fundamental distinguishing features of the DM643x family of devices.  You are asking for things that are not supported in the DM6431, but display (video output) capability is in the DM6437 and DM6433.  Video input (capture) is support in DM6437, DM6435 and DM6431.

    http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?family=dsp&sectionId=2&tabId=1863&familyId=1301&paramCriteria=no

     

  • Anonymous
    0 Anonymous in reply to BrandonAzbell

    Dear Brandon,

     

    According to the linked page, DM6431 has 1 Dedicated Input.

           

                 

         

     

    I compared the pin map of the two devices, and found that YOUT pins are multiplexed in 6437 with GPIO pins, while on the corresponding locations in 6431 there are only GPIO pins.

     

    So there is no way for this 300MHz processor to control even the simple LED screen of a graphical calculator? Can one use redundant GPIO pins to mimic YOUT pins behavior? If for high-speed and high-resolution video stream this is not possible, what about for low-speed textual and graphical information like on those TI graphical calculators?

     

     

    Zheng

     

  • 0 in reply to Anonymous
    TI__Guru 64480 points

    You will need to perform this analysis regarding the performance needs to support the LED screen you mention.  I won't say it is impossible, but I'm not knowledgable about the needs of the display you are referencing.

    This is an excercise you will need to perform.

    However, if you need a DM643x varient that has a display output, then either the DM6433 or DM6437 are the choices.

  • Anonymous
    0 Anonymous in reply to BrandonAzbell

    I see it, I will need to study this first.

     

    Zheng