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AWR1243: Frame Trigger Delay with HW Trigger

Antonio Puglielli
Expert 1025 points
Part Number: AWR1243

What is the impact of setting a frame trigger delay when using HW_TRIGGER mode?

I would like to use HW_TRIGGER mode with a frame delay. My understanding is that these are equivalent modes:
1) Sending the HW_TRIGGER pulse at time 0, and applying frame trigger delay = 5us
2) Delaying the HW_TRIGGER pulse by 5us in the host, and applying frame trigger delay = 0us

Thank you for your help.

Antonio

  • 0
    TI__Genius 14815 points

    Hi Antonio,

    The AWR1243 will be ready to accept a new trigger one programmed "Frame Period" after the previous externally provided hardware trigger pulse.

    So if you wish to provide the HW_Trigger pulse 5us delayed in the host, with a 0 frame trigger delay, please ensure that the programmed frame periodicity is reduced accordingly to make sure the AWR1243 is ready to accept the new trigger.

    Best Regards,

    Anand

  • 0 in reply to Anand Gadiyar
    Expert 1025 points

    Hi Anand,

    Thanks for your response. To clarify - in the attached diagram:



    m    y understanding is that it is ok to have different time between external frame trigger, as long as the device frame-periodicity is programmed to the minimum. In this example, frame-periodicity <= 10.5ms. Is this understanding correct?

    Thank you,
    Antonio

  • 0 in reply to Antonio Puglielli
    TI__Genius 14815 points

    Hi Antonio,


    This understanding is correct.

    Note however that the device is no longer in low-power mode once it is waiting for the external hardware trigger, and delaying the hardware trigger indefinitely may not be a good idea. We do not extensively test for conditions where the hardware trigger is provided far from the expected frame periodicity.

    Best Regards,

    Anand