Hi Rob, Thank you once again for answering my question! I have one more question?
Did you change anything in the default FPGA image, in order to be able to sustain a maximum 125 MS/s for 4 channels on N310, or 200 MS/s for 2 channels on X310? By looking into x310_rfnoc_image_core.yml and the same is for n310_rfnoc_image_core.yml, I can notice that replay is connected over the crossbar to DUC. The Connection would look something like PCIe -> CrossBarSwitch ->* Replay -> CrossBarSwitch *-> DUC -> Radio. I can imagine that it would be more efficient to connect Replay directly to the DUC. PCIe -> CrossBarSwitch ->* Replay -> DUC -*> Radio. However, I am not sure, would that work with the new design due to the clock domain crossings? Kind Regards, EMil On Tue, Oct 6, 2020 at 3:40 PM Rob Kossler <rkoss...@nd.edu> wrote: > Hi Emil, > With UHD 4.0, this works. And, the latest FPGA images from Ettus include > the Replay block on the X310 (in the past, this was just for the N310) so > you don't even have to build your own image. And, the latest FPGA images > provide access to the full 1GB ram such that you could store arb waveforms > for 2 channels with memory depth of 125M samps for each channel. > > I verified that I could play 4 channels at 125 MS/s from the UHD 4.0 > Replay block on the N310. I believe that I also verified 2 channels at 200 > MS/s on the X310, but I don't remember for certain. > > Rob > > On Tue, Oct 6, 2020 at 7:00 AM Emil Bjelski via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi All, >> >> I am investigating the option to stream samples from RFNOC_REPLAY block >> to two UBX-160 MHz cards with full speed (i.e. 200 Msps for each board). >> I would also like to support timing control for both of these two >> transmissions. >> >> I am planning to use new RFNOC architecture and UHD 4.0. >> However, before diving deeper I would like to hear from you if this is >> possible to be done in straightforward manner with the newest RFNOC >> developments. >> >> I see from the previous posts >> ( >> http://ettus.80997.x6.nabble.com/USRP-users-transmitting-on-two-channels-with-replay-block-td13915.html >> ). >> That with older RFNOC design and UHD 3.xxx streaming from RFNOC was >> limited to a single UBX radio. >> Meaning that an FPGA image with 2 Replay blocks was needed in order to >> stream samples to two UBXs radios. >> >> What would be the easiest way to proceed with new UHD 4.0? >> >> Thanks in advance on the answers, >> >> Emil >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >
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