ADV7181D, about data output during the blanking period.

Hi,

All video parts ADV7480) will send the video data (Active region) + Blanking data (Non-active region) and note that in the blanking areas, HDMI will carry the audio data and infoframe packages.

Generally Info-frames and audio packets will ride in the blanking areas.

[Question]
- Is it normal for the ADV7181D to output Data 0 during the blanking period ?

       Please let us know, What type of data that are outputting during blanking period from device A.

Thanks,

Poornima

Hi,

I would like to know about ADV7181D instead of ADV7480.

The all setting conditions for device A and device B in the attached file are the same, such as input=CVBS, script etc.
However, device A outputs data during blanking.
And what I would like you to confirm is this behavior of device A is correct or not.
Please let me know your thought on this.

Regards,
Gattu

Hi,

If its HDMI, then it will output audio and auxiliary data during blanking period.

Regarding BT.656, will check and let you know the status.

Thanks,

Poornima.S

Hi,

We look forward to your reply regarding BT.656.

Thanks,

Gattu.

Hi,

Is it normal for the ADV7181D to output Data 0 during the blanking period ?

   YES, in blanking period ancillary data will be output in BT.656 stream.

  Generally VBI Data Processor (VDP) of the ADV7181D is capable of slicing multiple VBI data standards on SD video. The VDP decodes the VBI data on the incoming CVBS/YC or YUV data processed by the SDP core. The VDP cannot decode VBI data on the YUV data processed through the CP core. The decoded results are available as ancillary data in output '656' data stream.

  This Ancillary data packets are used to transmit information (such as digital audio, closed captioning, and teletext data) during the blanking intervals.

 Note: During horizontal blanking, ancillary data may be transmitted in the interval between the EAV and SAV sequences. During vertical blanking, ancillary data may be transmitted in the interval between the SAV and EAV sequences. Multiple ancillary packets may be present in a horizontal or vertical blanking interval, but they must be contiguous with each other.

Thanks,

Poornima

Hi,

No data is input to the ADV7181D during the blanking period.
Therefore, device B does not output data 0 during the blanking period.

But device A outputs data 0 despite the same conditions.
Is this behavior correct or not?

Regards,
Gattu

Hi,

No data is input to the ADV7181D during the blanking period.
Therefore, device B does not output data 0 during the blanking period.

But device A outputs data 0 despite the same conditions.
Is this behavior correct or not?

Regards,
Gattu

Hi,

  Depending upon the source, the ancillary data will be present.

  Please let us know, Have you connected the source to device B which is connected to device A ?

Thanks,

Poornima

Hi,

Yes, the source is same both device A and device B.

Regards,
Gattu

Hi,

  Please share us the connection setup between device A and device B.

Thanks,

Poornima

Hi,

>Yes, the source is same both device A and device B.
It means the input source(CVBS) is same.

The device A and device B are mounted on different board. (One ADV7181D is mounted on the board)

Do you need schematic? If yes, can I share it on local e-mail?

Regards,
Gattu

Hi,

Could you please check register "0x62" and check whether "ADF_ENABLE" bit is enabled or disabled between device A & B. 

   ADF_ENABLE (VDP), Address 0x62, [7], User Sub Map ( This bit enables ancillary data output through 656 stream ). If 0 Disable insertion of VBI decoded data into ancillary 656 stream. If 1 Enable insertion of VBI decoded data into ancillary 656 stream and the blanking interval normally contains Teletext information.

Thanks,

Poornima

Hi,

Sorry for my late reply.
Result of further investigation, it output incorrect EAV / SAV.
So we requested analysis by ADI.

So this ticket will be closed.

Thanks!