Hi all,
I have a few questions concerning the connectivity capability of the
RFNoC system w.r.t the FPGA and the UHD driver.
The first of these concerns the limit of 16 CE blocks on the bus. In
an early RFNoC presentation it was suggested that a bridging CE block
could be designed to add another RFNoC network to the first RFNoC
network in a sort of daisy chain mode . Do Ettus have any examples
available which do this? Does the current UHD driver handle CE
discovery or enumeration over nested RFNoC buses? My understanding is
that whilst possible at a FPGA level it probably is not very practical
and is not supported by the current UHD driver.
Moving on from the situation described above, we could potentially
spread our RFNoC blocks over several USRP3 type devices using the SFP
10GSPs links to transfer between them. For example have one USRP3
device do the high speed front end processing and then pass the results
via SFP to a second USRP device to do complex algorithms of the received
data at a lower rate. How does the UHD driver and GNURadio handle this
scenario? Do we have to have 2 versions of GNURadio running or does the
UHD and GNURadio support seamless connectivity of the entire system,
assuming all blocks are communicating using RFNoC packets?. Assuming the
SFP connecting blocks are RFNoC bridge how does the system handle
multiple RFNoC connections spread over multiple devices?
Another network type application might be looking at the same signal
received in different locations where the USRP3 radios are connected by
network to the one other USRP3 or PCs. How would this application be
accommodated for using the current UHD and GNURadio systems?
Regards
Walter
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