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AWR1843BOOST: MCUCLKOUT

user6372746
Intellectual 520 points
Part Number: AWR1843BOOST
Other Parts Discussed in Thread: AWR1642, AWR1843

Hi,

Now I want to make MCUCLKOUT pin output frame sycn signal. The following pictures were captured from datasheets of AWR1843 and AWR1642 respectively. 

Fig. 1 AWR1843

Fig. 2 AWR1642

It seems MCUCLKOUT pin of AWR1843 has FRAME_START option while the pin of AWR1642 doesn't have this option. Does this mean AWR1843 can output frame sync signal and AWR1642 cannot output this signal?

Thank you 

  • 0
    TI__Guru 58035 points

    Hello ,

    Typically the signals like Chirp start, frame start etc. are only for internal debug/development purpose. What is your intended use for these signals?

    regards,

    Vivek

  • 0 in reply to Vivek Dham
    Intellectual 520 points

    Hi, 

    Thanks for your quick reply.

    Now we have multiple EVMs and we want to use the internal frame start signal to realize the synchronization of multiple boards.

    Thank you.

  • 0 in reply to Vivek Dham
    Intellectual 520 points

    Does the MCUCLKOUT pin of AWR1843 can output frame sync signal while this pin of AWR1642 can not output this signal ?

  • 0 in reply to user6372746
    TI__Guru 58035 points

    Hello ,

    Incase you want to synchronize multiple devices at frame level the recommended way is to use the digital SYNC IN signal and configure the devices in HW triggered mode. That way all the devices will start the frame at the pulse received on the SYCN IN signal.

    regards,

    vivek

  • 0 in reply to Vivek Dham
    Intellectual 520 points

    Hi, 

    Now we want to use one of EVMs to output fram sync signal, so other EVMs shoul be configured in HW triggered mode. So does the AWR1843 can output sync signal and AWR1642 cannot output this signal?

    Thank you.

  • 0 in reply to user6372746
    TI__Guru 58035 points

    Hello,

    As mentioned above , the FRAME Start signal is NOT the right signal for you to use to synchronize the two devices. You have two options:

    1) Best would be to provide a common HW SYNC IN pulse on the SYNC IN pins of the two devices and configure both of them in HW triggered mode.

    2) Second option would be to use the SYNC_OUT signal from one device (you can find the pins on which this signal can be muxed out from the datasheet) and connect it to the SYNC IN of the second device. This would have some mismatch due to your PCB routing delays and hence not exactly synced.

    Regards,
    Vivek