Hi Kyeong Su Shin, Thank you for your reply. We need to send out signal at a very precise time. Interval between packet transmitting needs to be an integral multiple of 1 / 10.23M, so the master clock rate is should be N*10.23MHz.
Best regards, Damon On Tue, 28 Apr 2020 at 12:45, Kyeong Su Shin <[email protected]> wrote: > Hello Guowang: > > First, if you are woking on GNSS (it's just my guess, but that's where > 10.23 MHz usually comes from), you usually DON'T need to use 10.23 MS/s > (see GNSS-SDR and gps-sdr-sim source codes). So, you may want to think > about that before proceeding further. > > If you absolutely want to use 10.23 MS/s, then you can try resampling your > data (either on your PC, on the FPGA, or both). It may require a pretty > serious resampler, though (could be difficult to this in real-time). > > You can try altering the actual hardware clock of the board, but do not > expect it to be a trivial task. > > Regards, > Kyeong Su Shin > ------------------------------ > *보낸 사람:* guowang qiu via USRP-users <[email protected]> 대신 > USRP-users <[email protected]> > *보낸 날짜:* 2020년 4월 28일 화요일 오전 3:52 > *받는 사람:* [email protected] <[email protected]> > *참조:* Damon Qiu <[email protected]> > *제목:* [USRP-users] 10.23Msps Sample Rate > > Hi all, > > We are trying to get 10.23Msps or 20.46Msps sample rate with X310. Latest > UHD driver enables USRP x310 support 184.32MHz to 200MHz master clock rate. > But it just support some discrete values，unfortunately, it just didn't > support 10.23M*18 or 10.23M*19. > We have tried to input an external reference clock of 10.23MHz, and we > want to cheat x310 that the external clock is 10MHz. We set the master > clock rate of the system as 200MHz. If the PLL can lock to the external > clock source, the actual master clock rate is 10.23 × 20MHz. However, when > the program is running, the UHD driver throws an exception, indicating: > terminate called after throwing an instance of 'uhd::runtime_error' > what(): RuntimeError: Reference Clock PLL failed to lock to external > source. > > Is there any way to obtain 10.23Msps sample rate with X310? > > Best regards, > Damon >
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