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AWR1243: Disable OSC_CLKOUT signal (pin A14) while the chip is in master mode.

Dominic Wu
Intellectual 515 points
Part Number: AWR1243


Hi, 

Is there a way to disable the 40MHz OSC_CLKOUT signal (pin A14) while allow the chip to operate in the multichip master mode (cascading configuration)? 

Thanks ,

Dom

  • 0
    TI__Guru 50240 points
    Hi Dom,

    I've asked an AWR expert to look into your query and someone should have an answer for you Monday.


    Cheers,
    Akash
  • 0 in reply to Akash Gondalia
    Intellectual 515 points
    Just to clarify, an external 40 MHz clock will be provided for all the chips to operate in a cascading configuration.
  • 0 in reply to Dominic Wu
    TI__Mastermind 18500 points

    Hi Dom,

    The 40 MHz clock fanout from the master device is meant only as a BOM reduction mechanism and there is no delay match requirement on the 40MHz clock domain. The chirp frame sync triggers will implicitly align the ADC output data domains and CSI transfers as they recover the mixed IF return data. So functionality should not be impacted by having each slave device on its own 40MHz source.

    However, the AWR1243 firmware ICD does include  DOES NOT INCLUDE a way to isolate the cascading functionality to exclude the OSC_CLKOUT functionality. Your design should be free to terminate the output on the PCB and ignore it.

    Please let me know if that answers your questions on this topic.

    Thank you,
    Randy

  • 0 in reply to Randy Rosales
    Intellectual 515 points

    Hi Randy, 

    I couldn't find an API call in the AWR1243 firmware ICD Revision 0.95 to solely exclude the OSC_CLKOUT functionality while leaving the CASCADING_CFG as MULTICHIP_MASTER. Would you be so kind and point me to that section please?  

    Thank you, 

    Dom 

  • 0 in reply to Dominic Wu
    TI__Mastermind 18500 points
    Hi Dom,

    I apologize for the typo in my last reply. I meant to say that there is NOT firmware support for this feature. So, yes, I agree with you, I cannot find it in the ICD either. Please see the crossed out and bold wording in my edited post above.

    The only option I can provide right now to safely not use the OSC_CLKOUT when in Cascade mode would be to terminate it to 50-ohms on your PCB.

    Please let me know if that answers your questions on this topic.

    Thank you,
    Randy