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DS90UB953-Q1: CSI-2 connection from 954 to 953

Tomoaki Yoshida91
Genius 5255 points
Part Number: DS90UB953-Q1

Dear all,

We are considering a configuration to input 953 from 954 CSI-2 output.

We are trying to implement replica output and repeater function by inserting 954 and 953 in the middle of the FPD-LINK between 953 and 954.

Our concern is the processing of I2C and GPIO.

Originally it was transferring data with forward channnel or back channel, but I2C and GPIO will be separated by inserting 954-953.

Can I directly wire I2C and GPIO between 954 and 953?

I am thinking that buffers and bridges are necessary.

Would you please give us your opinion?

Best regards,

Tomoaki Yoshida

  • 0
    TI__Genius 12705 points
    Hello,
    Yes, the GPIO and I2C can be wired directly between the 954 and 953 on the same board for a repeater functionality.
  • 0 in reply to Liam Keese
    Genius 5255 points

    Hi Liam-san,

    Thank you for your support.

    I understood that it can be physically connected GPIO and I2C directly between 954 and 953.

    For example, if it has set up a remote slave ID and slave alias as shown in the attached figure, is it possible to communicate between host and camera in the same way as the original even if I2C data is passed directly?

    954-953_connecting.pptx

    If added 954 and 953 have the same register setting as the original, is it OK?

    I am concerned about whether I2C data needs to be transformed once.

    Best regards,

    Tomoaki Yoshida

  • 0 in reply to Tomoaki Yoshida91
    Genius 5255 points
    Hi Liam-san,

    Any update on this issue?
    If it is inserted 954-953 into the original 953-954 system, delay will occur.
    Shoudl I need to take into consideration the delay caused by inserting 954-953 in the original system?
    I am worried about whether it is necessary to change the setting to insert 954-953.
    Is there a case that was used as a repeater like this?

    Best regards,
    Tomoaki Yoshida
  • 0 in reply to Tomoaki Yoshida91
    TI__Genius 12705 points
    Hello, you will need to have the 954 which is direct connected to the 953 via CSI-2 and I2C as a slave to the 953 and vice versa.
    Yes there will be some delay but as the CSI-2 is a packet based system, this should be fairly minimal and consistent. Please refer to the GPIO delay times to get rough idea.