Hi, I would suggest reading the RFNoC getting started guide ( https://kb.ettus.com/Getting_Started_with_RFNoC_Development) and making your correlator into a RFNoC block. Then it will be easy to include your correlator in a GNU Radio flow graph.
1) Where exactly in the code is the ddc chain instantiated *? Should I > do it myself ? > The DDC code is in the RFNoC DDC block, noc_block_ddc.v. The default X310 image includes two DDCs, so you don't need to instantiate anything. > 2) Is it possible to have a decimation rate of 200 or should it be a > power of 2 ? > You can have a decimation rate of 200. The DDC has a CIC filter along with 3 half band filters, so the decimation rate is fairly flexible. > 3) How is the decimation rate controlled ? From what I understand it's > from the sampling rate parameter in GnuRadio. Am I right ? If using the USRP Source block in GNU Radio, setting the sample rate will setup the DDC. If using Device 3 (i.e. a RFNoC flow graph) in GNU radio, you will need to set the decimation rate on the RFNoC: DDC block. Jonathon On Wed, Jul 17, 2019 at 5:30 PM fbarras via USRP-users < usrp-users@lists.ettus.com> wrote: > Hi all, > > I developed a custom correlation module in Verilog and I would like to > insert it in the usrp x310 fpga image. My goal is to send a signal > (with a usrp b205 mini) at a sampling rate of 1M and to receive it with > the usrp x310. Inside the fpga, my block will look for a certain > sequence inside the received signal. > > My block is working with a 200M clock and can support data rate up to > 2M. > From what I've read, it seems that the adc of the x310 is working at > 200M and that this can't be changed. So my module should be placed after > the ddc chain. But this rises a few questions: > > 1) Where exactly in the code is the ddc chain instantiated *? Should I > do it myself ? > > 2) Is it possible to have a decimation rate of 200 or should it be a > power of 2 ? > > 3) How is the decimation rate controlled ? From what I understand it's > from the sampling rate parameter in GnuRadio. Am I right ? > > Thanks ! > > * For some reasons, I'm working with uhd 3.10.3 > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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