The RFNoC bus can't sustain full-rate input (or output) to/from a single block on more than 1 port. The addsub block has two inputs and two outputs, so you can't operate the addsub block at 200Msps.
Nick On Mon, Jan 8, 2018 at 1:02 PM Adam Parower via USRP-users < usrp-users@lists.ettus.com> wrote: > Hello everyone, > > > I am trying to understand the usage of the Adder/Subtractor block in > RFNoC, as I would like to create my own RFNoC block with similar > functionality. I have the following flowgraph in GNU Radio: > > > Const Source --> | | --> DUC (5->200 Msps) --> | > | --> Radio A > > |DmaFIFO (2 ports)| > |Adder/Subtractor| > > Const Source --> | | --> DUC (5->200 Msps) --> | > | --> Radio B > > > This flowgraph produces lots of underflows. However, when I bypass the > Adder/Subtractor block, the flowgraph runs as expected. What > understanding about this block am I missing? Does it not support a sample > rate of 200 Msps, and if so, where/how is the maximum sample rate > determined/defined? > > > Thank you in advance for your assistance. > > > Adam Parower > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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