Hi Koen, Your block should not wait on tready, that is a violation of the AXI spec. Some blocks actually wait for tvalid to be asserted before asserting tready (that is permitted by the spec), which would cause a deadlock in your situation. You can work around that by putting an axi_flip_flop in the path since it will always assert tready when it can.
However, I don't think that is your issue. You should be interfacing your logic with the AXI wrapper instance in your block. AXI wrapper's s_axis_data_tready signal essentially connects to a FIFO, so you should see it assert. Do you see that? Jonathon On Fri, Aug 10, 2018, 5:52 PM TIMMEN Koen via USRP-users < usrp-users@lists.ettus.com> wrote: > Hello all, > > > > Last week I posted a question, on how I could confirm that a custom RFNoC > signal generator (piloted from a UHD API) functioned as intended. I > received the tip to probe my block using the Vivado ILA. A great idea, > because I did not know this existed (I am quite new in FPGA design) and it > is a useful tool. > > > > Now, I was able to confirm that my custom block is functioning as intended > by placing an ILA internal to it. However, no actual samples are ever > generated due to a design choice I made; sample generation is only > triggered when the block receives a tready signal from a downstream block. > In this case a DUC block. In other words, the block stays dormant, waiting > to receive a trigger. > > > > That leaves me with the question why it never receives this signal. Could > someone explain to me at what point a DUC block will assert its tready > signal? I was under the impression that as soon as I connected the blocks > (using uhd::rfnoc::graph::connect()) as follows: SIGGEN à DUC à Radio, > the DUC and Radio blocks would be asserting their ready samples directly > after. But apparently this is not the case. > > > > Thank you for your replies, > > > > Koen > > > > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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