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C6748 clock fan out question

John Bolton82404
Prodigy 230 points
Other Parts Discussed in Thread: TMS320C6748

Hi we are using the C6748 DSP and I have a question on fan out of the AHCLKX and AHCLKR pins.

Our external crystal is 22.5792 Mhz running 451.584 Mhz internally.

I have one SPI device on the McASP and 2 SPI devices on McBSP. I want to feed 3 external SPI devices SYSCLK's with the 22.5792 Mhz and was hoping I could use the AHCLKX output of the McASP. My question is can this pin drive the 3 devices? Also is there a better way to do this?

 

Thanks, John

  • 0
    TI__Guru* 84110 points

    John,

    We apologize that you did not get a response on this post.

    This is a board engineering question that needs to be addressed with a board simulation program using the IBIS model for your package, available on the TMS320C6748 Product Folder page under Software & Tools.

    Distance, loading, and board parameters can affect the results of your design for this signal.

    Regards,
    RandyP