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DS90UB954-Q1: About CSI-2 rising and falling standards (tRHS and tFHS)

Masanori Okano
Prodigy 230 points
Part Number: DS90UB954-Q1

Hi Team,

What can you tell me about tRHS and tFHS as described in the data sheet?

Will this standard RISE and FALL for differential waveforms?
Or are they rise and fall for single-ended P and N observations?
If you have a FIGURE, please provide it.

I checked by myself and found the following waveform on the Teledyne website.
Are tRHS and tFHS correct for this waveform observation method?
(I call this waveform single-ended observation).

Best Regards,

Masanori

  • 0
    TI__Mastermind 23735 points

    Hello Masanori,

    The parameters shared from the datasheet are from the MIPI D-Phy specification v1.2. You can refer to the specification on the MIPI website: MIPI D-PHY

    Additionally, the Teledyne waveform shared appears to be for MIPI M-Phy instead of D-PHY.

    Let me know if you have any other questions. 

    Best,

    Zoe

  • 0 in reply to Zoe Bison
    Prodigy 230 points

    Hello Zoe,

    Thank you for your answer.
    As we are not a member of the MIPI Alliance, we are unable to check the specifications.
    Therefore, I am making an enquiry.

    Is there a diagram defining the rise and fall of CSI in other devices of your company?

    Best,

    Masanori

  • 0 in reply to Masanori Okano
    TI__Mastermind 23735 points

    Hello Masanori,

    The rise and fall specification will be the same for single ended and differential waveforms. 

    We generally refer to MIPI specification and can not share from the document as it is restricted. For additional details, I recommend gaining access to the document through MIPI. 

    Best,

    Zoe

  • 0 in reply to Zoe Bison
    Prodigy 230 points

    Hello Zoe,

    As one example, a diagram is attached.
    It is an example, so it is not MIPI.
    From this diagram it is understood that the rise and fall in single-ended and differential waveforms will be the same specification.

    Incidentally, do you have any recommendations for acquiring waveforms?
    Is differential recommended since it is differential in operation?

    Best,

    Masanori

  • +1 in reply to Masanori Okano
    TI__Mastermind 23735 points

    Hello Masanori,

    I suggest referring to the Tektronix or Keysight websites for information on acquiring D-PHY waveforms. These websites will provide guidance on performing waveform measurements regarding the specification.

    In our own testing, we used the Keysight 1134B probes with differential probe heads. The waveform type recommended will be determined by the probes you are using.

    Best,

    Zoe

  • 0 in reply to Zoe Bison
    Prodigy 230 points

    Hi Zoe,

    Thank you for your answer.
    We will consider it closed.

    Best,

    Masanori