Problem of TVP7002 with 1080p@30

Hi,

The only difference between 1080p60 and 1080p30 is pixels, you could use same 1080p60 settings for 1080p30 and just change the pixel clock to half.

Regards,

Brijesh

Brijesh，thanks for your answer.I found this in the datasheet of TVP7002:

The internal sync separator provides support
for field rates (VSYNC frequencies) at or above 40 Hz. Separated VSYNC or an external sync separator must be
used to support formats having field rates less than 40 Hz.

Does this mean I should use an external sync separator?I don't want to use this ,is there any other methods?

If it is necessary,could you recommend me one ?

Thanks!

Hi,

Your question is handled on this thread : 

http://e2e.ti.com/support/data_converters/videoconverters/f/376/t/129640.aspx

You need to implement a loop between SOGOUT and VSYNC.

This patch works well for us

You also have to notice that the TVP7002 have a NRND status and should be obsolete in a near future.

Regards

Brijesh - does your comment have any link to the issue I've seen here, where we can only use 1080p30 if we use frame-skipping?

Hi Bob,

I did not get what is the question here. Are you trying to get the 30fps from TVP7002? you could use the siggestion provided at below link, there is also another way, Configure the TVP7002 in 1080p60 mode and skip/drop the frames to the 30fps from the capture driver. Let me know if you need more info on this.

http://e2e.ti.com/support/data_converters/videoconverters/f/376/t/129640.aspx

Regards,

Brijesh

Brijesh - we are not using a TVP7002, we have direct BT.1120 input to the DM368, but we see problems if we use 1080p30 where we must frame-skip every other frame to make the video smooth. Your original comment about pixel clock was not clear to me if it was a problem with the TVP7002 itself or with the DM3x, so I was wondering if it may be relevant to our problem.