Brian, I really only want to send data when appropriate. I don't have the code in front if me at the moment, but I can have tvalid high while I wait for tready, right. So I don't see why it would be an issue if I change tdata while tvalid is high and tready is low. But I've spent the last two days trying to debuf this before I found out it was the axi fifo filling up. It is weird to me that it is slowly falling behind. It makes me feel like tlast maybe has something to do with it..... -------- Original message --------From: Brian Padalino <bpadal...@gmail.com> Date: 8/22/18 4:04 PM (GMT-05:00) To: Jason Matusiak <ja...@gardettoengineering.com> Cc: "USRP-users@lists.ettus.com" <usrp-users@lists.ettus.com> Subject: Re: [USRP-users] RFNoC fifo filling up On Wed, Aug 22, 2018 at 3:53 PM Jason Matusiak via USRP-users <usrp-users@lists.ettus.com> wrote: This is a long shot, but I have been fighting with my rfnoc block the last few days trying to figure out why it won't work. I am basically combining the threshold block and the siggen block (so it takes in values, and spits out data based on the siggen parameters). My block has been spitting some samples on startup and then just stops. Digging around, what I can see is that the axi_fifo_short's FIFO primitive is filling up. If I add debug to my testbench, I can see that my data is slowly losing the war on reading as fast as I am writing. Once it is full, I end up in a deadlock it appears. Since this is somewhat custom, there probably isn't a good answer, but does anyone have a suggestion where to look into this? The main module where I think my axi_interfaces are getting screwed up somehow (on my end) is the axi_async_stream.v module. ANY help would be appreciated!!!! It sounds like you want your siggen block to be able to produce samples without following the flow control coming back to you (tready). Unfortunately, you can't. You need to obey tready and stop the generation of samples accordingly. Is this what's happening? Your siggen block kicks off, and at some point, tready goes low, but you still want to push tvalid and tdata out? Brian
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