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AWR1243: CSI2 start /end tming chart

Hitoshi Sugawara
Mastermind 19970 points
Part Number: AWR1243

Hi Experts,

Could you please teach me when CSI2 transfer starts and ends in the picture attached.

We would like to clarify the CSI2 timing and the workaround for ANA#07.

Thank you very much in advance for your kind support.
Best regards,
Hitoshi

  • 0
    TI__Guru 58035 points
    Hello Hitoshi San,
    In order to avoid the glitch due to CSI transition the data from the previous chirp should be completely transfered out over CSI before the samples of the next chirp begin. In order to achieve this the (Idle time + Ramp end time - ADC sampling time) should be > (Time required for CSI transfer +7 usec).

    Time required for CSI transfer is = (total number of bytes to transfer * 8 )/ ( CSI data rate * number of CSI lanes).

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    TI__Mastermind 19970 points
    HI Vivek,
    I understood about ANA#07 and workaround. Thanks.
    What I would like to exactly know is that the timing chart which shows the CSI2 start timing and end timing on the attached ramp timing of the chirp.
    For example, CSI2 transfer starts immediately just after ADC sampling time finishes.
    And CSI2 stops and goes to LP, just after all necessary data is sent out through CSI2 with a few microseconds delay.
    Am I making sense?
    Thank you for your kind teaching me.
    Best regards,
    Hitoshi Sugawara
  • 0 in reply to Hitoshi Sugawara
    TI__Guru 58035 points
    Hello Sugawara San,
    The CSI transfer is initiated just after last ADC is collected. After that the timings and transitions on the CSI is basically followed based on the MIPI protocol. You can refer to the MIPI protocol document to understand the CSI timings.

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    TI__Mastermind 19970 points
    Hi Vivek,
    Thank you very much for your check.
    I have leant that CSI2 (HSI) can be triggered just after ADC is collected for each chirp.
    Now it clears the timing chart for CSI2 and Chirps.

    Best regards,
    Hitoshi