> Hey Andrew, > > Thanks for the reply - we are looking forward to the ROACH 2 in the > future. > > I haven't been able to open all of the tutorials, but I have seen a few. > So I apologize if I may have missed something obvious, and I would even > really appreciate an answer that says "hey you, go read about this." I > see > that data can be saved using a snap block, and I could save a concatenated > set of samples as a single 64 bit integer, and I can save a maximum of > 2^16 > of these. Is there a better way of using the roach memory to guarantee > that I can read and save all of the data continuously? I'm wondering if > there is perhaps a way of constantly reading from a snap register fast > enough to insure that we have captured the data continuously and saved it > to our external computer.
Hi Laura. In addition to what Dan just said, I want to point out that the 10m/100m/1g bps port (on at least many ROACH I's) is not reliable at 1 gbps. So you would be streaming 10 MB/s (80 mb/s plus framing) over a 100 mb link. Pretty risky... The 10 gbe solution is better in so many ways. If your computer is within a few meters of the ROACH, I highly recommend you think about buying a 10 gb card for the computer. It'll only cost ~$500.00 plus a $100.00 cable, and will save you a lot of sleepless nights, I think! John > > --Laura > > > On Mon, Mar 12, 2012 at 11:59 PM, Andrew Martens <[email protected]> wrote: > >> Hi Laura >> >> The ROACH does not have a direct 1Ge connection to the FPGA, any data >> must exit via the PPC if it is not going through the 10Ge links. >> >> The ROACH2 however, has a 1Ge link directly to the FPGA. The yellow >> block has been completed and has been designed to act the same as the >> 10Ge links (basically the same interface, can be accessed from the PPC >> if needed, ARP table managed from PPC etc) except that the data rate is >> lower (8 bit data paths instead of 64 bit). >> >> We should be finalising these yellow blocks and making an announcement >> soon so that people who are interested can start designing for ROACH2. >> >> Regards >> Andrew >> >> On Mon, 2012-03-12 at 17:22 -0700, Laura Vertatschitsch wrote: >> > Hey Casperites, >> > >> > I see a lot of data about reliable streaming using the 10GbE ports and >> > a lovely simulink block to boot. Is there an analogous method for >> > streaming data out over the 1Gbps ethernet? >> > >> > Not sure if someone has written some python control scripts to >> > accomplish this - I may have just missed it on the wiki. We would >> > love to stream 10MHz time-domain data off our board. >> > >> > --Laura >> >> >> >
