[USRP-users] RFNoC DDC/Radio block/port restrictions

Brian Padalino bpadalino at gmail.com
Tue Mar 19 14:10:22 EDT 2019


On Tue, Mar 19, 2019 at 1:52 PM Rob Kossler via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hi,
> Are there restrictions regarding which DDC ports must be connected to
> which Radio ports.  I am using an X310/UBX with a custom C++ rfnoc
> application and would like to do the following:
>   Radio_0:port0 -> DDC_0:port0
>   Radio_1:port0 -> DDC_0:port1
> Unfortunately, this fails (using default FPGA image) with a recv() after
> about 3K samples.  If I simply change the 2nd link above to the following,
> then everything is fine.
>   Radio_1:port0 -> DDC_1:port1
>
> Why is the first config invalid?  If this is a bug, is it presently being
> worked on?
>

Radio produces samples at 200Msps.  Each AXI bus port is 64-bits wide and
around 180-ish MHz.

So you are limited by the AXI bus bandwidth.

Does that make sense?

Brian
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