hi laura,
are you trying to clock your FGPA at 200 or 400 MHz? if you configure the ADC yellow block to input 4 samples per clock, and sampling at 1600 Msps, then you will need to clock your fpga at 400 MHz, which is pretty near impossible for virtex 5 and you'll get lots of timing errors. if you configure the yellow block to input 8 samples per clock, and sampling at 1600 Msps, then the FGPA is clocking at 200 MHz, and routing and timing should work. best wishes, dan On 5/13/2010 6:46 PM, Laura Spitler wrote:
Hi everyone, Does anyone have a sense of whether a dual polarization, 800 MHz spectrometer with ~2k channels would fit into a ROACH? I have a test design using the ADC083000 and and two small wideband FFTs. It seems to work in terms of utilization, but I get a crazy number of timing errors. Has anyone successfully built anything like this? Thanks, Laura
