[USRP-users] Need advice to find out the appropriate place in module radio of X310 FPGA code to observe sample streams

Isen I-Chun Chao chao926 at gmail.com
Sun Oct 5 07:46:07 EDT 2014

Hi Ian,
Thanks for responding. I thinks the last one (observing it at the sample
rate) is what we are looking for.

Once we can observe the sample streams and create a timestamp for a regular
packet from Tx to Rx (by observing sample streams), we need to be able to
access it either from default UHD APIs or from extended/customized UHD APIs.

*Best Regards,Isen I-Chun Chao*

On Sun, Oct 5, 2014 at 3:40 AM, Ian Buckley <ianb at ionconcepts.com> wrote:

> Do you want to observe a sample stream at the ADC/DAC rate or the sample
> rate over-the-wire to UHD/GNURadio?
> On Oct 4, 2014, at 10:38 PM, Isen I-Chun Chao via USRP-users <
> usrp-users at lists.ettus.com> wrote:
> Hi,
> I am tracing *radio.v *of X310 FPGA code and trying to figure out the
> data path and control path so I can find an appropriate place of observing
> the incoming sample stream from ADC and outgoing sample stream to DAC. We
> hope to add a customized module which can monitor both sample streams and
> create timestamp information for application layers. However, since I only
> can learn how this module, *radio.v*, works by viewing the source code,
> which is more complicated than I thought, I am actually lost in it.
> For example in rx path, I did find there is signals from '
> *rx_dsp.ddc_chain*' called *samples[31:0]* connecting to the module '
> *new_rx_framer*' to produce *o_tdata[63:0]*, but then I can't figure out
> the operating logic in the rest of modules, such as module '
> *new_rx_control*', '*rx_sfc*', ..., this signal go through.
> Maybe based on what we need we don't have to understand each part in
> *radio.v*, and we just need to know how some critical subsets of this
> module works to achieve our objective? Or we just need to know where is the
> right place for adding our customized module?
> As the matter of fact, we have spent few weeks on it and so far we have no
> progress. Could anyone please advise me? I would very appreciate it.
> Thanks
> *Best Regards,Isen I-Chun Chao*
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