Replace "upstream" with "downstream" below. On Thu, Aug 18, 2022 at 1:28 PM Rob Kossler <rkoss...@nd.edu> wrote:
> Hi Adrian, > As you indicated, the RFNoC blocks axi_ram_fifo and Relay both use the > FPGA RAM. axi_ram_fifo doesn't need any registers for control because it > just accepts an AXI stream on the input and forwards that exact stream on > the output. The "control" is in the AXI tvalid/tready handshaking. Thus, > if the upstream block is not ready, the FIFO starts filling up but does not > empty until the upstream block is ready. But, for the Replay block, this > block stores the incoming stream to RAM until you later decide to play it > out. It can be used in the transmit path to load a waveform into RAM such > that it can be played out to the Tx Radio without any help from the host > PC. Or, it can be used in the receive path to store receive samples as > they arrive (up to the given RAM memory depth) and then later downloaded > (played out) to the host PC in non-realtime. > > While I don't know your specific application, I wondered if the Replay > block (or the axi_ram_fifo) can already implement your desired > functionality such that a custom block is not needed. > Rob > > On Thu, Aug 18, 2022 at 8:25 AM <adrian.cam...@integrasys-sa.com> wrote: > >> I am making a custom block which has to start storing data to be read >> later, in other words store the data in a FIFO. I am interested in using >> the RAM provided by the E320 so I want to take advantage of the >> axi_ram_fifo code. However, I don't really understand the control of that >> block, how can I control when to start writing data to memory and when to >> start reading it? I have checked the registers in case it could be >> controlled from there like the replay block that has two registers to start >> reading and another one to do a restart but I haven't seen anything like >> that. >> >> I hope you can help me. Thank you very much in advance >> >> >> _______________________________________________ >> USRP-users mailing list -- usrp-users@lists.ettus.com >> To unsubscribe send an email to usrp-users-le...@lists.ettus.com >> >
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