All synthesized clocks are synchronized to whatever reference is selected. On Mon, Aug 5, 2019 at 1:03 PM Cherif Diouf <c.e.v.di...@tudelft.nl> wrote:
> Thanks Nick, > > > That's fine as explanation. I however need a HW clock synchronized to the > 10 MHz external reference. I am using some local counters to run timely > operations. If not using the 200 MHz clock Is it possible to synchronize > the 214 MHz clock to the 10 MHz external reference. > > > Best Regards > > Cherif > > > ------------------------------ > *From:* Nick Foster <bistrom...@gmail.com> > *Sent:* Monday, August 5, 2019 6:33:37 PM > *To:* Cherif Diouf > *Cc:* usrp-users@lists.ettus.com > *Subject:* Re: [USRP-users] 214 MHz ce_clk vs 200 MHz radio_clk, USRP X310 > > The radio TX frontend backpressures upstream blocks. You don't have to > worry about providing samples at the frontend rate. There is no reason to > use a 200MHz clock in your block. > > Remember: if the frontend is operating at 200Msps, then the samples your > block is producing must assume a 200Msps sample rate. It doesn't matter at > all that the clock driving your block is 214MHz -- that only means that the > logic is operating a bit faster. > > Nick > > On Mon, Aug 5, 2019 at 8:58 AM Cherif Diouf via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> >> >> >> ------------------------------ >> >> Hello guys, >> >> >> >> I am working with the X310 USRP. I have developed customed RFNoC CEs >> running at ce_clk which is no more 200 MHz but rather 214 MHz. >> >> So my blocks are providing samples to the RF frontends at 214 MSps. Is >> that right? >> >> Then how the operation can be consistent when the sampling rate of the RF >> frontends is still at 200MSps. >> >> >> Is it possible to synchronize both the 214 MHz and the 200 MHz clocks to >> the same 10 MHz external reference, or to use the 200 MHz reference clock >> as my HW blocks main clock? >> >> >> >> >> Best Regards >> >> Cherif >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >
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