[USRP-users] X310 Replay Block and receiver timming

Wade Fife wade.fife at ettus.com
Tue Feb 5 20:20:13 EST 2019

Hello James,

Unfortunately, the Replay block doesn't currently support timed commands,
so the behavior you saw is expected. This is something that we have
discussed as a future improvement. In the mean time, I think that your
Verilog modifications might be the right approach.



On Tue, Feb 5, 2019 at 1:52 PM Xingjian Chen via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hi,
> Is there any method can control the timing for the RFNOC Replay Block in
> X310?
> I tried adding time spec but the transmitter failed to start. In fact, as
> long as I set "stream_cmd.stream_now = false;"  then, the transmitter
> will not turn on unless set it back to true and power restart the X310.
> stream_cmd.time_spec = tx_radio_ctrl->get_time_now() +
> uhd::time_spec_t(2.0 );
> replay_ctrl->issue_stream_cmd(stream_cmd, replay_chan);
> Also, I tried using timed command, but no luck.
> The goal of the project is to transmit and receive pulses at the same time
> and get the timing well controlled. We succeeded in doing so by having a
> clock trigger in the Verilog file. I am wondering if it is possible by just
> using UHD command in c++ level to align transmitter and receiver in time.
> Thank you for your time.
> James
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> USRP-users at lists.ettus.com
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