Using ADV7393 as black burst generator output on RGB or YPbPr

Hi,

 Please make sure the following i2c writes are taken care from your side for SD blackbar test pattern.

   0x00 = FCh ; Power up DACs and PLL
   0x02 = 24h ; Enable Black bar test pattern // 04 RGB component output
   0x82 = 49h ; Pixel data valid and setup DACs
   0x84 = 40h ; Enable test pattern
For more details about ED/HD blackbar test pattern configuration, Please refer Internal test pattern generation section.

Thanks,

Poornima

Hi, 

my understanding from the previous threads was that the internal Test pattern Generator does not use the SYNC information given on the HSYNC and VSYNC Pins. It just uses the 27MHz clock to generate the pattern selected.

My intention here is not to use the internal test pattern Generator and drive the SYNC signals with the pixel data bus grounded, thus generating a black burst signal on the configured output interface.

Hi,

my understanding from the previous threads was that the internal Test pattern Generator does not use the SYNC information given on the HSYNC and VSYNC Pins. It just uses the 27MHz clock to generate the pattern selected.

  Yes. The test pattern only uses the clock input, it does not use the external sync signals.

My intention here is not to use the internal test pattern Generator and drive the SYNC signals with the pixel data bus grounded, thus generating a black burst signal on the configured output interface.

 We don't have any specific requirements or recommendations for Genlock. Please refer here https://ez.analog.com/video/f/q-a/11249/using-adv7391-for-genlock---black-burst

 Note:  Generally Black burst is a composite video signal with a totally black picture. It is used to
synchronize video equipment so the video outputs are aligned.

Thanks,

Poornima

Hi,

my understanding from the previous threads was that the internal Test pattern Generator does not use the SYNC information given on the HSYNC and VSYNC Pins. It just uses the 27MHz clock to generate the pattern selected.

  Yes. The test pattern only uses the clock input, it does not use the external sync signals.

My intention here is not to use the internal test pattern Generator and drive the SYNC signals with the pixel data bus grounded, thus generating a black burst signal on the configured output interface.

 We don't have any specific requirements or recommendations for Genlock. Please refer here https://ez.analog.com/video/f/q-a/11249/using-adv7391-for-genlock---black-burst

 Note:  Generally Black burst is a composite video signal with a totally black picture. It is used to
synchronize video equipment so the video outputs are aligned.

Thanks,

Poornima

Hi,

Does this mean the ADV7393 device can function as a Genlock source without any additional modifications? 

If not, could you please suggest an alternative device which can generate Genlock signal from the H,V,F signals driven to it?

Hi,

 I am not aware of this black burst generator.But as per expert comment "ADV7842 is a new design and It's going to be much easier to get support on and you could try out your input signals with the eval board which is very easily (and cheaply) available for it. Tri-level syncs also available in ADV7842". Please refer here https://ez.analog.com/message/49418

Thanks,

Poornima

Okay. Thanks for the support.