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TVP5150 PAL output resolution

Ilgaz Az
Prodigy 70 points
Other Parts Discussed in Thread: TVP5150, TVP5150AM1

I'm using TVP5150 for video ADC in my project. 

There is video compression IC connected to TVP5150 output. 

I have an issue with NTSC and PAL source.

I have configured my video compression IC to NTSC resolutions and I can see the video from output of video compression IC.

When I used PAL source and configured accordingly, I can't see anything.

I think that the problem is about PAL resolution configurations of my IC.

What is the PAL resolution that TVP5150 generates? I knew that it's 720x576i. For NTSC 720x480 is OK.

Is it right?

And how can I learn horizontal&vertical front&backporch values for PAL. I have found some values but I need specially TVP5150..

 

 

Thanks in advance...

Ilgaz

  • 0
    TI__Genius 15310 points

    Ilgaz,

    You got it right, the resolution for PAL and NTSC are 576x720 and 480x720 respectively.  When you connect to PAL, do you see H and V lock?  You can tell from reading the status register 88h, bit 2 and 1 are for V and H lock status respectively.

    Also, you can check if it detect the standard correctly by reading register 28h.  If the reading is 04h then it is detecting PAL signal.

    Regards,

    Viet

  • 0 in reply to Viet Dinh
    Prodigy 70 points

    Dear Viet,

    I need informations about vertical&horizontal backporch&frontporch values of PAL actually..

    Does it depend on TVP5150?

    May you please supply me these informations?

     

    Thanks in advance...

  • 0 in reply to Ilgaz Az
    TI__Genius 15310 points

    Hi Ilgaz,

    Could you be more specific to what you need on this?  Are you using embedded sync BT656 output?  Are you having problem setup the backend with PAL only but not NTSC?

    Regards,

    Viet

  • 0 in reply to Viet Dinh
    Prodigy 70 points

    Dear Viet,

    My compression IC is very complex and it has lots of registers to define the input video stream specifications.

    For eq, resolution, porch values, no of macroblocks, embedded/seperate sync, frame rate etc...

    Register of IC should be completely correct to start encoding a frame.. We have done lots of experiments, and we are sure about it. 

    We have succeeded to run it, but we have some issues about video quality.. The reason may not be directly porch or something else but it may also.

    While using PAL source, IC sometimes start to encode or not.

    The difference between two configuration is porch values, specially vertical porch..

    I don't actually know how should I say or it's a correct sentences but I need to know the vertical&horizontal front&backporch values of TVP5150 has(or generates from analog).

     

    I have read the datasheet and find something. Active pixel : 720, Total pixel : 864 for PAL. I think that horizontal porch is 144. But I need the front and backporch seperately. 

    And also, what's the vertical porch? If you supply me these informations, I'm glad :)

     

    Note : My IC can work well while using NTSC source and its values..

     

    Thanks in advance...

    Ilgaz AZ

    Design Engineer

     

  • 0 in reply to Ilgaz Az
    TI__Genius 15310 points

    Hi IIgaz,

    Are you using embedded sync?  The TVP5150 is output PAL ITU BT.656 standard embedded sync.

    Regards,

    Viet

  • 0 in reply to Ilgaz Az
    TI__Expert 6120 points

    Hello Ilgaz,

    The vertical timing is provided in Figure 3-5 of the TVP5150AM1 data manual.

    The horizontal timing is provided in Figure 3-6 of the TVP5150AM1 data manual.

    Recommend that you use embedded syncs.

    Regards,

    Jim