Hi. Sorry for what might appear as a commercial at first - but I do have some real questions at the end - I'll try to the description short.
We have developed a new RF learning platform [1] on a standard FMC card [2] (meets the electrical requirements, not the mechanical - it's too long) - which can connect to nearly any recent Xilinx development system, that we started showing at X-Fest[3] yesterday. The advantage of this, vs some existing platforms is bandwidth. The DAC is a 16-Bit, 1200 MSPS (limited on this platform to 1GSPS, due to the clock chip we used), and the ADC is 14-Bit, 250 MSPS. The RF side includes a 400 MHz to 6 GHz Quadrature Modulator/Demodulator, separate Tx and Rx LO Synthesisers (35MHz to 4400MHz), and fixed gain on the Tx side, and a Variable Gain on the Rx Side. It's clocking can handle multiple boards attached to the same FPGA (for MIMO), and can sync to a 1 pps (from GPS, or IEEE 1588) to sync many, many, many boards together. The demo we are showing at X-Fest is the FMComms board, attached to a Xilinx ML605 FPGA, which runs Linux on Microblaze - playing a tone (Xilinx DDS) out the DAC, modulating that up to 2.4 GHz, sending it out the antenna, receiving it on the same board, demodulating it (at 2.4GHz), passing it through the VGA, to the ADC, were we capture the samples (into DDR), passing the data to GNU plot to create a png, and then passing the png to a web server, so it can be displayed on an external client across the network. We have ported this to the Series 7 platforms - KC705, and others, and are in process finishing the port to Zynq[4] - for the standard Xilinx ZC702 platform [5] and the newly announced Zed[6]. This (I think) is where things get a little interesting. Microblaze running Linux is a little pokey - Zynq on the otherhand - is a dual ARM Cortex A9, running at 800MHz each, plus FPGA fabric - which allows some serious horsepower. This is a kit (Zynq+FMComms) that Avnet plans on selling [7]. Which brings me to the question: We already have Linux IIO drivers[8] for all the parts on the board (including the ADCs[9] and DACs[10]), and are just trying to determine how (if at all) this fits within the GNU Radio framework. When I looked at things (which wasn't very long) - I didn't see much in terms of native / real time connections to a platform which was running Linux (PCIe, other other bus). Did I miss something? Thanks in advance -Robin Just to be fair - others have done the same type of FMC Card [11] - the advantage we have is gobs of channel bandwidth - enough to sample all of bluetooth without doing any hopping at all. [1] http://wiki.analog.com/resources/fpga/xilinx/fmc/ad-fmcomms1-ebz [2] http://www.vita.com/fmc.html [3] https://www.weboom.com/avnet2012/ [4] http://www.xilinx.com/products/silicon-devices/epp/zynq-7000/index.htm [5] http://www.xilinx.com/products/boards-and-kits/EK-Z7-ZC702-G.htm [6] http://www.zedboard.org/ [7] http://www.em.avnet.com/en-us/design/drc/Pages/Analog-Devices-Zynq-Software-Defined-Radio-Kit.aspx [8] http://wiki.analog.com/software/linux/docs/iio/iio [9] https://github.com/mhennerich/linux/blob/fa8fc592243c82c0ddaa43f51be10e2123e1fa9b/drivers/staging/iio/adc/cf_ad9467_core.c [10] https://github.com/mhennerich/linux/blob/fa8fc592243c82c0ddaa43f51be10e2123e1fa9b/drivers/staging/iio/frequency/ad9122.c [11] http://www.4dsp.com/FMC30RF.php _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
