ztex USB-FPGA board
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Re: ztex USB-FPGA board
by Newman, Timothy
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Luke Kenneth Casson Leighton wrote:
> http://shop.ztex.de/product_info.php?cPath=21&products_id=28 > > dear gnuradio developers, > > i was searching on opencores.org to see if there was a SoC that > incorporates an FPGA(-like) device with an open core, and i > accidentally encountered the above USB-FPGA board. it has a Cypress > CY7C68013A/14A 480mb/s USB-2 Microcontroller and a Xilinx Spartan-3 > XC3S400 FPGA. it is also accompanied by a developer board: > > http://www.ztex.de/usb-fpga-1/exp-1.1.e.html > > the price for the USB-FPGA is an incredibly-low $EUR 70, and the > developer board is only $20. > > so my primary question is: is this USB-FPGA board (apart from the > issue of connecting to A-D / D-A boards) suitable for use to do an > 802.11b transceiver? is it fast enough? > > many thanks, > > l. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@... > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > implement certain portions of the 802.11b waveform. The primary bottleneck is the USB bus, and you can't get 20 MHz of bandwidth over that bus. BBN and whoever else worked on the current GNU radio 802.11b waveform solved this by moving the despreading to the FPGA. This is just one example. In the end, it completely depends on where you implement the latency and bandwidth sensitive components of the waveform. Tim _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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Re: ztex USB-FPGA board
by lkcl-2
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On Sun, Nov 1, 2009 at 1:56 PM, Tim Newman <trnewman@...> wrote:
> Luke Kenneth Casson Leighton wrote: >> >> http://shop.ztex.de/product_info.php?cPath=21&products_id=28 >> >> dear gnuradio developers, >> >> i was searching on opencores.org to see if there was a SoC that >> incorporates an FPGA(-like) device with an open core, and i >> accidentally encountered the above USB-FPGA board. it has a Cypress >> CY7C68013A/14A 480mb/s USB-2 Microcontroller and a Xilinx Spartan-3 >> XC3S400 FPGA. it is also accompanied by a developer board: >> >> http://www.ztex.de/usb-fpga-1/exp-1.1.e.html >> >> the price for the USB-FPGA is an incredibly-low $EUR 70, and the >> developer board is only $20. >> >> so my primary question is: is this USB-FPGA board (apart from the >> issue of connecting to A-D / D-A boards) suitable for use to do an >> 802.11b transceiver? is it fast enough? >> >> many thanks, >> >> l. >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@... >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > This is a fairly loaded question, as it completely depends on WHERE you > implement certain portions of the 802.11b waveform. The primary bottleneck > is the USB bus, and you can't get 20 MHz of bandwidth over that bus. ah - eek! i wasn't anticipating it to be that much. i was expecting a much-reduced amount of data. > BBN > and whoever else worked on the current GNU radio 802.11b waveform solved > this by moving the despreading to the FPGA. This is just one example. ohh, ok - so it's doable - just.... rather technical :) thanks for responding, tim. l. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@... http://lists.gnu.org/mailman/listinfo/discuss-gnuradio |
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