Re: [USRP-users] Replay Block: Stream using both channels to different radios simultaneously
400 Msps would be 1.6 GB/s for sc16 samples. I think X310 bus_clk is 166.66 MHz for a peak throughput of 166.66 MHz * 8 bytes/cycle = 1.333 GB/s, so it would require two separate replay blocks (separate buses, not just separate channels). I don't know if the memory bandwidth would be adequate since I haven't tried it, but since the replay block is read-only during operation (not simultaneous write then read like the DMA FIFO), it might be possible. Wade On Wed, Dec 5, 2018 at 3:21 PM Brian Padalino via USRP-users < usrp-users@lists.ettus.com> wrote: > On Wed, Dec 5, 2018 at 4:13 PM Max Thomas via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Hi, >> >> When attempting to stream different waveforms using both channels of the >> replay block simultaneously to two radios on the same USRP (X310) there are >> under-runs. Any ideas why this is happening? The replay block works as >> expected when using either channel 0 or channel 1, but fails when >> attempting to stream channel 0 and channel 1 simultaneously. >> > > I believe the DRAM connected to the FPGA can't handle 400MHz of bandwidth. > > It might be able to work if you decimated to 100MHz streams and > interpolated each radio by 2x. Is that a possibility? > > Brian > ___ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
Re: [USRP-users] Replay Block: Stream using both channels to different radios simultaneously
On Wed, Dec 5, 2018 at 4:13 PM Max Thomas via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi, > > When attempting to stream different waveforms using both channels of the > replay block simultaneously to two radios on the same USRP (X310) there are > under-runs. Any ideas why this is happening? The replay block works as > expected when using either channel 0 or channel 1, but fails when > attempting to stream channel 0 and channel 1 simultaneously. > I believe the DRAM connected to the FPGA can't handle 400MHz of bandwidth. It might be able to work if you decimated to 100MHz streams and interpolated each radio by 2x. Is that a possibility? Brian ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[USRP-users] Replay Block: Stream using both channels to different radios simultaneously
Hi, When attempting to stream different waveforms using both channels of the replay block simultaneously to two radios on the same USRP (X310) there are under-runs. Any ideas why this is happening? The replay block works as expected when using either channel 0 or channel 1, but fails when attempting to stream channel 0 and channel 1 simultaneously. Thanks ___ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
