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DS90UB953-Q1: About supported the output data format of sensor

sugi shuichi
Prodigy 140 points
Part Number: DS90UB953-Q1
Other Parts Discussed in Thread: TDES960, DS90UB960-Q1, , TSER953

(Background)
　We are currently in the process of selecting components for MIPI's FPD-Link III.
　The required specifications for our products are as follows. On the TX side, 4 MIPI sensors are input to each serializers, converted to FPD-Link signals, and transmitted.
On the other hand, on the receiving RX side, the signals are input to 4-input FPD-Link deserializer hub, and then converted back to MIPI signals.

(Selected LSI)
　TX side; DS90UB953
　RX side; TDES960

(Contents)
　The data sheet clearly states that the following sensor data output formats are supported. In particular, I have the impression from the text that it is stated with the nuance of "only this sensor output format can be used".

Q1) Can these LSIs transmit the sensor format "2560x1936@15fps MIPI;4(lane)"?
　(Especially, It uses the same sensor and the same data format for all sensors.)


Q2) If the sensor is compatible with MIPI standard ver1.3, can we transmitted the MIPI signal by these LSI?

  • 0
    TI__Mastermind 30290 points

    Hello,

    The serializer that you have chosen (DS90UB953-Q1) is an automotive part and is not compatible with the TDES960, which is an Industrial part. If your application is automotive, then please use the automotive DS90UB960-Q1 part instead. If your application is Industrial, then please use the Industrial TSER953 part instead. Our Automotive and Industrial lines of products are not cross-compatible with each other.

    Q1) The 953 part supports a video throughput rate of up to 3.328Gbps. It has 4 CSI-2 data lanes at its input CSI-2 Port and each data lane can accept up to 832Mbps of video data. Video throughput is calculated, using the equation below:

    Video Throughput = HActive x VActive x FPS x Bits-Per-Pixel x Overhead (Assume 25% if unknown)

    After calculating the total video throughput into the 953 serializer from your image sensor, you need to check to see if that data can be fed into the active data lanes in your design. For example, if the total video throughput is 2Gbps and your design uses 4 active CS-2 data lanes, then the application is feasible because you can transfer 500Mbps of video data per CSI-2 data lane. Your post does not mention the data type of the CSI-2 data, so I am not sure of the Bits-Per-Pixel in your application.

    Q2) As long as you use compatible serializer and deserializer parts, then you can transmit CSI-2 video streams from multiple cameras into one or two CSI-2 output ports on the 960 quad hub deserializer. The 960 has multiple video aggregation schemes, so you can read the 960 datasheet for more information on how the CSI-2 data will be outputted from the 960. There is also additional overhead when the 960 is aggregating video data from multiple video sources, so it would be best to check to make sure the 960 can handle the input video streams. Below is a quick learning video on CSI-2 aggregation.

    https://training.ti.com/csi-2-aggregation-breakdown?context=1134310-1139225-1148220

    If you are able to provide more details on your desired setup, then I can use an internal calculator tool to help check if bandwidth limits are being met in your FPD-Link system.

    Best,

    Justin Phan

  • 0 in reply to Justin Phan
    Prodigy 140 points

    Hello Justin Phan.

    Thank you for replying about my questions.

    First of all, About automotive parts. Thank you for your suggestion. We need industrial products. but, I'm going to use DS90UB953.

    (3) About: "Can these LSIs transmit the sensor format "2560x1936@15fps 12bit MIPI 4(lane)"?"

    　I calculated the data rate of sensor working.

    Video Throughput = HActive x VActive x FPS x Bits-Per-Pixel x Overhead (Assume 25% ifunknown)
    =2560*1936*15*12*1.25 = 1.12Gbps

    And, One lane is "1.12/4=280Mbps".

    In case of DS90UB953, the max data rate is up to "4.16Gbps", and max one lane's data rate is "832Mbps".

    Then, my judgment : Pass

    Q3-1) Is above result OK?

    Q3-2) Can I also use TSER953 for DS90UB953 of MIPI's condition above?

    One more question.
    Now, In case of Sensor's Line Blank priod is so long time, I have a question. In this case, the MIPI data rate of sensor's is 1.2Gpbs/lane. This one is exceed for Spec of DS90UB953.

    Q3-2) Is above case NG?

    Best regards,
    Shuichi Sugi.

  • 0 in reply to sugi shuichi
    TI__Mastermind 30290 points

    Hello Shuichi Sugi,

    sugi shuichi said:
    First of all, About automotive parts. Thank you for your suggestion. We need industrial products. but, I'm going to use DS90UB953.

    This is not a suggestion. You must use all industrial or all automotive parts in a paired SER/DES system. Please use the industrial TSER953 part instead, since it seems your application is not automotive.

    Since your design does not need automotive-qualified parts, it is always highly recommended to use the industrial counter-part instead. The industrial component is less expensive than the automotive component. Also keep in mind that the chip supply for our automotive parts are prioritized for automotive customers. We have a separate supply set aside for industrial customers within our V3Link portfolio.

    Q3-1) If your imager has 15-fps and the data type is 12 bits-per-pixel, then your calculation is correct. The total video throughput is about 1.115-Gbps and our 953 part can support up to 3.328-Gbps total video throughput, across 4 data lanes.

    Our 953 serializer supports between 80-Mbps to 832-Mbps of CSI-2 data lane input at each data lane.

    If you have 4 data lanes routed from the Imager to the 953 serializer, then each data lane will carry about 280-Mbps, which is supported by the 953 serializer.

    Q3-2) The TSER953 and the DS90UB953-Q1 have the same technical specifications for the CSI-2 video throughput. The main difference is that the TSER953 is not automotive qualified and you must use either only Industrial or only Automotive paired devices in your application. You cannot mix products from different automotive and industrial portfolios and pair them together.

    Q3-3) A pairing that mixes industrial and automotive parts is NG.

    Best,

    Justin Phan

  • 0 in reply to Justin Phan
    Prodigy 140 points

    Hello Justin Phan.

    Thank you for explaining your detail contents. And I am received big help from you now. Thank you.

    I'll choose industrial products between a serializer and a deserializer. So in my case, I must choose "TSER953" and "TDES960" right?.
    Is it correct?

    (If I have to use an automotive grade, I'll choose "DS90UB953-Q1" and "DS90UB960-Q1".)

    - About your answers "Q3-1 to Q3-3"
    I understood your explanation about MIPI's conditions. especially ,I am able to understand how to calculate a data rete for a MIPI on the FPD-Link III products.

    p.s：
     At one of the output in the deserializer is select one of the input MIPI(4-lane ) channel become fixed on. So, we will use a deserializer as MIPI's multiplexer.

    Best regards,
    Shuichi Sugi.

  • +1 in reply to sugi shuichi
    TI__Mastermind 30290 points

    Hello Shuichi Sugi,

    You need to choose a serializer and deserializer that are in the same Industrial or Automotive portfolio. The TSER953 and TDES960 devices are in the same Industrial portfolio and you can connect them to each other in the same system. The DS90UB953-Q1 and DS90UB960-Q1 are in the Automotive portfolio and can only be paired with other automotive devices. Since your application is Industrial, then you should use the TSER953 and TDES960 pair of devices.

    And yes, the deserializer has a fixed MIPI output on each CSI-2 data lane, which can be programmed through registers. Make sure to set the output rate high enough to be able to properly output all of the data the deserializer is receiving. If you need help with these calculations, then please let me know. I have an internal calculator tool that can calcaulte CSI-2 aggregation bandwidths at the deserializer.

    Best,

    Justin Phan

  • 0 in reply to Justin Phan
    Prodigy 140 points

    Hello Justin Phan,

     Thank for having a good supports. So, I also understood your kindness explanations in last thread. I learned a lot for PSD-Link III from you.
     If I'll have a question for that one, I ask you again.

     Thank you.

    sincerely,
    Shuichi Sugi