[USRP-users] RFNoC DDC/Radio block/port restrictions
rkossler at nd.edu
Tue Mar 19 14:38:59 EDT 2019
On Tue, Mar 19, 2019 at 2:10 PM Brian Padalino <bpadalino at gmail.com> wrote:
> 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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