Brent M. Ledvina wrote: > Hi, > > I am running into a USB bandwidth issue. I'm sampling data > simultaneously from 2 daughter boards at a decimation rate of 10. This > produces 2*6.4 MS/s * 4 bytes/I and Q sample = 48 MB/s.
Actually, the correct calculation of data rate is: 6.4 MS/s * 2 * 2 = 25.6MB/s One factor of 2 is for I and Q. The other is for 2 bytes per sample, since 16 bit samples are sent over the USB. They are converted to floats on the host computer. > My application requires one board to have a decimation rate of 10, but > the other can have a decimation rate of ~30. My understanding of the > USRP is that you cannot easily (i.e. in software) use different > decimation rates for different daughter boards on the same USRP. My > questions are: 1.) Is this easy to do at the FPGA level? 2.) Has > anyone tried this before? It is not possible with the default FPGA build to use different rates for 2 RX streams. The TX and RX can have different rates though. Matt _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
