On Thu, Jul 27, 2006 at 04:39:43PM +1000, Jason Hecker wrote: > >>(http://www.plxtech.com/products/io_accelerators/PCI9030/default.htm) > > > >That's one route, though 32-bit 33-MHz PCI is pretty much the bottom > >of the barrel these days. Hence the interest in PCI-Express and/or > >Express Card. > > True. At a glance I couldn't see any alternative from PLX for faster > PCI busses. PLX's chips are fairly inexpensive though. As an > alternative could you use an FPGA as the PCI-Express to USRP MkII > interface?
You could, but I think you burn up a pretty good chunk of a big FPGA doing it. There are PCI-Express to PCI-X (and/or PCI) bridge chips. I believe this is one way (short of a custom asic) to make this all work. Then at least your card gets _all_ the bandwidth available from PCI-X. 64-bit 66-MHz or 100-MHz gets pretty reasonable ;) > >the USRP on the tower, next to the LNA and PA. > > You might be able to implement power-over-ethernet to the USRP with this > method as well. No need to implement 802.3af (I think that's the > spec.). Even though there are no spare pairs to use for a DC feed on a > GigE CAT5 cable there are ethernet transformers which can isolate and > insert a common mode DC current onto a pair of CAT5 wires. I think it would be hard to get enough power for the PA over the CAT5. Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
