Hey Jeff, at first glance, it looks like you're doing it all right. What's the size of your input buffer on your custom DUC? Also, can you post a full log of the streamer setup?
-- M On 01/09/2018 08:41 AM, Long, Jeffrey P. via USRP-users wrote: > Looking for some advice and help on RFNOC…. > > > > I am creating a custom RFNOC block that will roughly do what the > noc_block_duc does but instead uses a fractional polyphase interpolator. > I believe I have everything working correctly in terms of the tlast and > EOB and for single timed bursts it seems to work fine which I can verify > on the scope and in chipscope. However when I switch to a streaming data > I start getting UUs. If I look at it in chipscope it appears that the > incoming data is just not being supplied fast enough. My block is not > pushing back. In terms of rates I am using a 1 gig Ethernet connection > and am running 32 times interpolation in my block with the radio block > being set to 200 MHz. This would imply that I have a 6.25Msps required > feed rate to my block. I think this should be well within the 1 gig > capability. Again I verified that my block is not pushing back so it > really appears the data is not coming down fast enough. My rfnoc graph > consists of the radio core connected to my block and then to the host. > Nothing else. > > > > I am wondering are there flow control things that I am not doing > properly in my block. Perhaps the host UHD code is not getting the right > feedback for the flow control? Perhaps sample line rate settings that I > should be doing? In my UHD code I am only setting the sample rate in the > radio core and it only accepts 200 MHz but does that somehow screw up > the flow control? Is there special sauce in the duc that makes it > necessary to use that with the radio core to get the rates correct? > > > > Thanks for any help. > > > > Jeff > > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > _______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
