AWR1843: Frame timing for coherent processing of multiple frames

The beginning of the frame can be triggered in Sw or Hw.

When sw frame trigger is used, the beginning of next frame is computed based on timer running in firmware at 200MHz

thank you
cesar

Hi Cesar,

we use the software trigger, no external trigger is supplied to the AWR18. The waveform config has fixed frame periodicity and an infinite number of frames.

Is the frame timing cycle accurate? I.e., one frame to the next is always the same number of 200 MHz clock cycles?

Sebastian

Hi Sebastian,
Processing multiple frames at a time may require more memory to store the intermediate results. So you need to consider this condition while trying this experiment.
What is "precise" mean here? While switching to next frame device internally takes time to configure and trigger the next frame but overall it maintains the full frame period as configured by the application.

So for the application, it sees the frame (timing) as the numbers it has configured the device.


Regards,
Jitendra

Hi Jitendra,

the waveform needs to be set up to leave enough memory for long-time data collection, of course.

When calculating speed based on the phase difference of a target from one frame to the next (for very low speeds) the frame periodicity and any jitter on that will affect the result.

What is the maximum deviation from the set, e.g. 40 ms, frame periodicity? 1/(200MHz)=5ns? Is there any device specification that this value can be derived from?

Sebastian

Sebastian

I still don't have an answer for this question.

It should take a few more days

thank you
Cesar

I am sorry for the delay

Was still not able to get a response from the design team

The goal is to have an answer early next week

thank you
Cesar