Thank you very much for the explanation, Dan and John. I remember a CASPER video, where showed that everything worked fine with one IBOB, 8 inputs and 2K channels. I will try this setting :-)
Best Regards Rolando Paz 2013/8/11 John Ford <[email protected]> > Hi rolando. I'll add a little to what Dan said in his mail. > > > Hello CASPER > > > > I have some doubts, and I hope you can help me understand. > > > > Regarding correlators: > > > > 1. What is the reason of using one Roach (exclusively) for F engine, and > > one Roach (exclusively) for the X Engine, through one switch? > > > > The switch is used in correlators with a large number of inputs, that is, > more than can fit on one Roach or ibob, or in applications where the > X-engine is split over more than one device. The switch acts as a way to > send parts of the spectrum to different x engines for correlation. As Dan > says, you don't necessarily need a switch just for small systems that fit > on one board. > > > 2. Why can not use the latest libraries to program the FPGA IBOB card? > > As dan says, the Virtex-II Pro is no longer supported by new Xilinx tools, > and the Matlab/Simulink versions in use for the newest libraries are not > compatible with older tools, so can't be used with them. > > > > > 3. To build a correlator with IBOB's (8 input/two QuADC), what would be > > the > > advantages of using one IBOB to F engine, and one IBOB for X engine? Or > > just one IBOB is enough? > > If it all fits on one board, then that is definitely easier. If it fits > or not would depend on the bandwidth you need, the number of channels you > use, and the number of bits used in the calculation, among many other > factors. > > John > > > > > Best Regards > > > > Rolando Paz > > > > >
