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

Rob Kossler rkossler at nd.edu
Tue Mar 19 14:38:59 EDT 2019


Yes.  Thanks!

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:
>
>> 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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