• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 636 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB953-Q1: Is the backchannel communication is needed

Revanth A1
Intellectual 300 points
Part Number: DS90UB953-Q1
Other Parts Discussed in Thread: DS90UB954-Q1,

Hello,

Iam planning to use DS90UB953-Q1 and DS90UB954-Q1 for converting Mipi to serial and serial to mipi data correspondingly, Here in between instead of cable we are planning to use unidirectional optical link to transmit the data, so the backchannel communication wont work. My doubt here is whether these IC's use the backchannel data to configure themselves or for any synchronisation other than MIPI I2C. for the DS90UB953-Q1 and DS90UB954-Q1 IC configuration separate MCU is provided

 

  • 0
    TI__Genius 11340 points

    Hello,

    Could you clarify what's the reason you're not using the back channel? There's no downside to using the back channel.

    Best,

    Jiashow

  • 0 in reply to Jiashow Ho
    Intellectual 300 points

    Hello  

    Since we are using a unidirectional optical link from serializer to de-serializer backward communication is not possible, we will be connecting only the mipi lanes (which is basically uni-directional) to the serializer form camera module and at the de-serializer output we will be taking the MIPI output again.

    Camera --> Serializer (DS90UB953) --> uni-directional optical transmitter --> uni-directional optical receiver --> Deserializer (DS90UB954) --> MIPI Processor

    Here we will have separate microcontroller to control serializer and camera module via I2C , also a separate microcontroller to control deserializer IC and we expect no internal i2c transaction between the serializer and deserializer IC. is that possible?

  • 0 in reply to Revanth A1
    TI__Genius 11340 points

    Hi Revanth,

    In non-synchronous mode, you can supply a separate refclk to the serializer and have the serializer drive forward channel using that clock. You can then turn off back channel (reg 0x58 = 0x00) in the 954. 

    I'm still not clear on the reason why you need a uni-directional optical transmitter. A typical use case of our SerDes is to connect a coax/stp cable to link the 953/954.

    Best,

    Jiashow

  • 0 in reply to Jiashow Ho
    Intellectual 300 points

    Hello Jiashow,

    Thanks for the update. For complete isolation purpose we need a optical connection and not the wired or any physical Connection between the system processor and the camera. But one can transmit mipi data optically by converting them to a serial single channel LVDS first, hence we are using Ti serializer and deserialzer for this purpose.

    We will look into it and get back if we feel we need something. Thanks for the support.