Hi Rurik, Sorry for opening an old thread.
I am trying to run fpga on ROACH2 board (we have 2 ADC5g with 1:1 DEMUX mode) at 160 MHz. I see the zdok1 snapshot data shows no data whatsoever while snapshot from zdok0 is fine. The MMCM also fails for zdok1. Have you successfully ran fpga at lower frequencies ? Cheers, Amit On 17-Jun-15 1:32 PM, Primiani, Rurik wrote: > Hi Amit, > > The range of frequencies you are trying, is this a test tone going > into the IF? The MMCM calibration should be done using the ADC's test > ramp output mode not an external IF input. Are you setting both ADC's > into test ramp output mode before attempting the calibration? The > procedure for calibrating the ADC's should go like this in Python: > > from adc5g import * > set_test_mode(roach, 0) > set_test_mode(roach, 1) > sync_adc(roach) > opt0, glitches0 = calibrate_mmcm_phase(roach, 0, ['scope_raw_0_snap',]) > opt1, glitches1 = calibrate_mmcm_phase(roach, 1, ['scope_raw_1_snap',]) > unset_test_mode(roach, 0) > unset_test_mode(roach, 1) > > Best, > Rurik > > > On Wed, Jun 17, 2015 at 5:09 AM, Amit Bansod > <[email protected] <mailto:[email protected]>> wrote: > > Hi Rurik, > > Thanks a lot for useful inputs on the adc calibration. > > We tried MMCM calibration for zdock=0,1 for a few range of frequencies > (100 MHz, 150 Mhz, 187.5 MHz,200 MHz) and we observed that the MMCM > fails for zdock=1 for frequencies: 100 & 150 MHz. > > I looked at the glitch profile for these two frequencies and there was > no region with zero glitches. What would be a good strategy to debug > this issue ? I can send you the glitch profiles and bit code if > that is > useful. > > Best Regards, > Amit > > > > On 12-Jan-15 5:13 PM, Primiani, Rurik wrote: > > Hi Amit, > > > > That sadly looks nothing like a sine wave. > > > > The adc5g package is some Python code I developed to operate the > ADC5g. > > Please see the Github link below: > > > > https://github.com/sma-wideband/adc_tests/ > > > > It is important to calibrate the MMCM clk-to-out phase using the > > procedure outlined below. I think this may be why your output > looks so > > strange. > > > > Are familiar with Python and the corr package? > > > > Thanks, > > Rurik > > > > > > On Mon, Jan 12, 2015 at 10:51 AM, Amit Bansod > <[email protected] <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>>> wrote: > > > > Hi Rurik, > > > > I am not using the ADC5g package. The fpga is running at 150 > MHz. > > > > Earlier, I did not take care of offset binary output but it > did not > > solve the problem. > > > > By "not consistent with expected results", I mean some data > points > > were offset by large amount. I have attached the plot (first 128 > > data-points) for reference. > > > > I have not done any core-to-core mismatch corrections. Do > you think > > that could be an issue ? > > > > Thanks & Regards, > > Amit > > > > > > > > On 12-Jan-15 4:05 PM, Primiani, Rurik wrote: > > > > Hi Amit, > > > > Could you please provide an example plot of what you > mean by "not > > consistent with expect results"? > > > > Questions: > > > > 1. What is your clock rate? > > > > 2. Have you calibrated the MMCM? > > > > 3. The ADC output is offset binary, are you correctly > > interpreting it as > > such? > > > > 4. If you are using the adc5g python package the BRAM output > > needs to be > > converted to signed binary before capture (by > subtracting 128). > > Have you > > done so? > > > > 5. Have you done any core-to-core mismatch corrections? > > > > 6. Less importantly, is your clock generator reference > locked to > > your > > test tone synthesizer? > > > > Thanks, > > > > Rurik > > > > > > On Mon, Jan 12, 2015 at 9:58 AM, Amit Bansod > > <[email protected] > <mailto:[email protected]> > <mailto:[email protected] <mailto:[email protected]>> > > <mailto:abansod@mpifr-bonn. > <mailto:abansod@mpifr-bonn.>__mpg.de <http://mpg.de> > > <mailto:[email protected] > <mailto:[email protected]>>>> wrote: > > > > Dear All, > > > > I am trying to test the ADC output for a simple > sinusoid input > > signal (75 MHz, -6dBm) with the snapshot block. > > > > Many of the output values are not consistent with > the expected > > results. Do I need to do any post-processing on data > after > > reading > > from Bram ? > > > > Regards, > > Amit > > > > > > > >
