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DS90UB914A-Q1: What's the exact output format of DS90UB914A?

Wei Xiao
Intellectual 605 points

Part Number: DS90UB914A-Q1

Is it 10 or 12-Bit 4:2:2 YCrCb with  ITUR BT.601/656 standard?

  • 0
    TI__Mastermind 31640 points

    Hello Wei,

    Our FPD-Link devices are mainly bridge devices with diagnostics features, that don't manipulate the video data it receives. Our devices will pass along whatever data is received.

    The 914A is a parallel video interface deserializer that does not process the data it receives. If the connected serializer is the 913A, then the 914A will directly output the data that is inputted into the 913A serializer, on the corresponding output pin of the 914A. The 914A has 12 video data output pins and can operate in 10-bit/12-bit modes. This means that the 914A outputs video data in 10-bit or 12-bit words. Any video data that is inputted to the 913A serializer would have to fit into the 10-bit or 12-bit words.

    A common application is also to set the 913A/914A to 10-bit mode, but only route 8 video data output pins to the processor. This allows transfer of 8-bit video bytes. If the customer application is to transfer YUV422 8-bit video data (16 bits-per-pixel) over the 913A/914A channel, then they would have to route 8 video data lines to/from the 913A/914A and then transfer the YUV422 8-bit video data over 2 bytes.

    Best,

    Justin Phan

  • 0 in reply to Justin Phan
    Intellectual 605 points

    Hi Justin,

    Thank you for the reply. In fact, we are trying to decode the signals from the cameras in 2019 and later Jeep Wrangler and Dodge RAM vehicles, which use DS90UB913A in them. Do you know in those applications what signal format are used?

  • 0 in reply to Wei Xiao
    TI__Mastermind 31640 points

    Hello Wei,

    If you had the specific camera module's name that was used in those car models, then I might be able to find out more details, but I am not sure, based on the description that you've given.

    Best,

    Justin Phan

  • 0 in reply to Justin Phan
    Intellectual 605 points

    Here are the Mopar model numbers that I know of:

    68452959AC;68288397AC; 68414411AA; 68452959AA; 68452959AB; 04672585AA; 68414414AA; 68322864AF; 04672735AD

  • 0 in reply to Wei Xiao
    TI__Mastermind 31640 points

    I will check to see if we have any record of this, but I can't guarantee anything. It would be more effective to reach out to the camera manufacturers, to see if there is a datasheet or schematic that you can get.

  • 0 in reply to Justin Phan
    Intellectual 605 points

    Not sure how to reach the manufacturer of the cameras. Probly Mopar contracted some company to make them, and I would imagine it's impossible to get information like schematic for them.

    I took some pics of the camera board, and the deserializer portion of the oem head unit. It seems that all ROUT pins are connected. Not sure if that can help tell the format of the image signal. Here are the pics:

    www.dropbox.com/.../AACg5VU6r1BXNrdEAx3fCFY1a

  • 0 in reply to Wei Xiao
    TI__Mastermind 31640 points

    Hello Wei,

    I do not see any of those camera modules in our records. I do not believe that the TI side would have the schematics for the camera modules that you've listed. 

    The only way to get any documentation is to find the camera module manufacturers or contact the OEM. If all of the ROUT pins of the 914A deserializer are routed and the MODE pin has resistors that set it to 12-bit MODE, then the 913A/914A will be configured to transfer 12-bits at a time. However, the specific data type that the camera is sending out is not something that TI would have knowledge of.

    Best,

    Justin Phan 

  • 0 in reply to Justin Phan
    Intellectual 605 points

    I measured the resistors connected to the MODE pin, and it's set to 10-bit mode. The datasheet said that, "Internally, the DS90UB913A/914A chipset operates in a divide-by-2 mode in the 10-bit mode". Does that mean what you mentioned, "transfer the YUV422 8-bit video data over 2 bytes"?

  • 0 in reply to Wei Xiao
    TI__Mastermind 31640 points

    What I meant in my previous post is that if the 913A/914A are set to 10-bit MODE, then 10 of the RIN/DOUT pins on the SER.DES devices will be active and transferring video data. Any data applied to the active RIN pins on the 913A will be transferred to the corresponding DOUT pins on the 914A.

    If the camera is configured to transfer YUV422 8-bit video data (16 bits-per-pixel), then the camera can route its video data pins to RIN[0:7] of the 913A SER. Any video data applied there will appear on the DOUT[0:7] pins on the 914A. 

    If the camera is configured to transfer YUV422 10-bit video data, then the BPP is 20 and will have to be routed to RIN[0:9].

    Basically, the input to the 913A device will transfer whatever is applied to its RIN pins to the DOUT pins on the 914A deserializer. The camera module itself determines its video format. You can probe the DOUT pins on the connected 914A deserializer, to see the video data that is being outputted, if the camera module is outputting video data.

    Best,

    Justin Phan