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quesions about the dm8168 video input parser:YUV422,BT1120.

SuitJune Young
Genius 3985 points

In the Dm8168 spec sprugx8  ,2.11.1  features "YUV422 8-bit embedded sync mode (exclude BT.1120)     YUV422 8-bit discrete sync mode "

what does it mean?BT.1120 can be 8bit?And in this forum,TIer told me that BT.1120 can only be 16bit or 20bit.

In Gennum doc,GV7601 can send 10bit BT.1120(alse can be 8bit with lowest 2bit unused) .

Could someone tell me the truth? 

  • 0
    TI__Mastermind 20245 points

    Hi,

    You are correct BT1120 is 16/20 bit. DM816x can take 16-bit so you can gracefully drop lowest 2-bits and will  be able to capture BT1120 16-bit using BT1120.

    Regards,

    Hardik Shah

  • 0 in reply to HardikShah
    Genius 3985 points

    I mean that BT.1120 is 10Bit or 8Bit?

    Reason 1:http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/100/t/112523.aspx

    "Which spec did you check for BT1120? What I found in BT1120 spec is that the video data is 8-bit or 10-bit words. So there is no problem for DM368 to receive the BT1120 format data." By Chris Meng Ti FAE

    Reason2:

    this photo is from BT.1577.          BT.1120 is 10bit word.

    Peason3: From the GV7601 doc,just the picture I posted.10Bit BT.1120

    Reason4:

    the former "YUV422 8-bit embedded sync mode",it mentions"exclude BT.1120"

    But  the latter "YUV422 8-bit discrete sync mode",also 8bit,it doesn't mention "exclude BT.1120".

    View from another angle,YUU422 8Bit can be BT.1120.

    But in this case,you can not send BT.1120 embedded sync mode data into vip.

    And,if BT.1120 discrete sync mode,DM8168 can receive it. 

    is it?

    thank you. 

  • 0 in reply to SuitJune Young
    TI__Mastermind 20245 points

    Hi answers embedded,

    SuitJune Young said:
    I mean that BT.1120 is 10Bit or 8Bit?

    BT1120 is 16 or 20 bit.

    SuitJune Young said:
    "Which spec did you check for BT1120? What I found in BT1120 spec is that the video data is 8-bit or 10-bit words. So there is no problem for DM368 to receive the BT1120 format data." By Chris Meng Ti FAE

    BT1120 standard is a part of ITU standard. I dont think specs are free.

    I think you are confused between word size and interface size. For BT1120 and BT656 both you can have word size as 8/10. But for BT656 Y and UV will be transmitted to VIP as 8-bit parallel interaface with Y and UV time multiplexed with double the clock frequency. For BT1120 Y and UV will be transmitted as 16-bit parallel interface with 1X clock frequency. VIP supports both.

    Regards,

    Hardik Shah