Hello Laura, That is correct, handling data at a rate much higher than 8 MS/s will require moving DSP into the FPGA. UHD comes with a variety of example RFNoC blocks. The fosphor block for instance produces a real time spectrum analyzer plot of the full 61.44 MS/s of the E310.
Regards, Derek On Mon, May 14, 2018 at 3:57 PM, Laura Huddleston < laura.huddles...@ierustech.com> wrote: > So just to clarify, I would need to program the FPGA explicitly if I want > to achieve a sample rate of higher than 8MS/s? > > > > ~~~~~~~~~~~~~~~~~~~~~ > > Laura Huddleston > > > > *From:* Derek Kozel <derek.ko...@ettus.com> > *Sent:* Friday, May 11, 2018 1:53 PM > *To:* Laura Huddleston <laura.huddles...@ierustech.com> > *Cc:* discuss-gnuradio@gnu.org > *Subject:* Re: [Discuss-gnuradio] Ettus E310 sample rate > > > > Hello Laura, > > The ADCs and DACs do support running at 61.44 MS/s. However the ARM > processor is not able to handle data traffic at that rate so some of the > processing must be done in the FPGA. Depending on the application about 10 > MS/s is an achievable rate. > > Both 12 MS/s and 8 MS/s are not integer divisors of 61.44 MHz so the ADC > rate is being changed behind the scenes to support those rates, probably to > 16 or 32 MHz. You can explicitly set that by adding an argument to the > benchmark_rate or similar utility. > > benchmark_rate --args master_clock_rate=36e6 --rx_rate 12e6 --tx_rate 12e6 > http://files.ettus.com/manual/page_configuration.html > <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ffiles.ettus.com%2fmanual%2fpage_configuration.html&c=E,1,nH9KxXceSLzJFSOzmoWmuPuOeyzhDqRW-NaNjMqUmHj9_FPsx-b-4GZY7_e9NL_YCJ-HiseC3el8znQVER-UqKZaU9xTdegD9i8MIh08dTiyalNa6kIvPCk,&typo=1> > > Regards, > > Derek > > > > > > On Fri, May 11, 2018 at 7:37 PM, Laura Huddleston < > laura.huddles...@ierustech.com> wrote: > > Happy Friday, > > > > What is the max sample rate for the Ettus e310? > > > > When I ssh in and perform the benchmark_test, I get the following: > > > > $/usr/lib/uhd/examples/benchmark_rate --rx_rate 12e6 --tx_rate 12e6 > > . > > . [other stuff here] > > . > > UHD Warning: > > The hardware does not support the requested TX sample rate: > > Target sample rate: 12.000000 MSps > > Actual sample rate: 8.000000 MSps > > Testing transmit rate 8.000000 Msps on 1 channels > > > > When I set the target sample rate to 16MS/s, I get OOOOOOOOOO. > > > > Does this mean that 8MS/s is the highest sample rate which the e310 will > work? > > > > The data sheet says the max ADC/DAC sample rate is 61.44MS/s, so shouldn’t > I be able to stream data at a divisible of this? > > > > ~~~~~~~~~~~~~~~~~~~~~ > > Laura Huddleston > > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >
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