A quick question about getting data off the ROACH. We have built a 256 channel narrow band channelizer for ROACH. Each channel outputs complex I and Q data at 500 kHz, so when we want to stream the full data rate we are using a 10 GbE port and UDP.
We are now implementing an on-board optimal filter and pulse detection algorithm which will cut our data rate down drastically - probably to around 30 Mbits/sec. This is comfortably doable over a 1 GbE port, which would be nice since we could avoid expensive CX4 hardware. What are the highest data rates people have achieved getting data from the FPGA through the 1GbE port on the powerPC? Did you use KATCP? Any tips on setting up the FPGA firmware/PowerPC/Data Acq PC to optimize this transfer? Thanks, Ben __________________________________________________________________ Ben Mazin Phone/Fax: 805-893-3344 Assistant Professor Department of Physics University of California Office: 2015A Broida Hall Santa Barbara, CA 93106 USA http://www.physics.ucsb.edu/~bmazin/
