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