Hi Jack, Thank you Jack. I am using the mlib-devel from https://github.com/sma-wideband/mlib_devel Also, I am using ISE 14.7.
Regards, Sharat On 4 September 2015 at 12:34, Jack Hickish <[email protected]> wrote: > Hi Sharat, > > Tomorrow (in California) I'll send you a link and instructions to use the > calibration script I have, which should work ok at 2500mhz clock. > > In the meantime, it might not matter, but what version of mlib-devel are > you using? > > Cheers, > Jack > > On Thu, 3 Sep 2015 9:02 pm sharat varma <[email protected]> wrote: > >> Hi, >> >> Thanks for the reply and sorry for the delayed response. >> Yes, the x-axis represent the time and y-axis represents the signed 8 bit >> output. The negative bias is due to the nature of the input. >> >> I was trying to use the files in the link you mentioned, but I keep >> getting the error shown below. I am using the bof file provided for roach2. >> >> test roach connectivity ... ok >> check if requested bof is available ... ok >> test roach pingability ... ok >> program the requested bof ... ok >> estimate clock rate, should be within 1 MHz of expected ... ok >> confirm the design has the ADC SPI controller ... ok >> confirm the design has the needed scope ... ok >> test if calibration finds optimal MMCM phase ... FAIL >> >> ====================================================================== >> FAIL: test if calibration finds optimal MMCM phase >> ---------------------------------------------------------------------- >> Traceback (most recent call last): >> File "test_adc5g.py", line 107, in test_optimal_solution_found >> self.assertIsNotNone(self._optimal_phase) >> AssertionError: unexpectedly None >> >> ---------------------------------------------------------------------- >> Ran 8 tests in 7.230s >> >> FAILED (failures=1) >> >> Please let me know if I am doing anything wrong or where could be the >> problem. >> >> For your information: >> >> System: roach2 >> >> ADC : ASIAA ADC5G ADC >> >> Clock : 2500MHz. >> >> Thanks and regards, >> >> Sharat >> >> >> On 1 September 2015 at 23:01, Primiani, Rurik <[email protected]> >> wrote: >> >>> Hi Sharat, >>> >>> The plot you provided has no labels or units so I will assume the x-axis >>> represents time in samples and the y-axis represents signed 8-bit sample >>> values. I'm not sure why there is such a negative bias but perhaps that's >>> particular to your instrument. >>> >>> Please, at the very least, run the MMCM calibration described at >>> https://github.com/sma-wideband/adc_tests to reduce glitches on the >>> interface. I believe Jack also has a more sophisticated approach which >>> adjusts the IODELAY for each individual data line; sadly I don't have a >>> link handy for that. >>> >>> Although you may not see these glitches with a sine wave, a noise-like >>> signal will cause more transitions on each bit and thus more glitches with >>> an uncalibrated interface. >>> >>> Thanks, >>> Rurik >>> >>> >>> >>> On Tue, Sep 1, 2015 at 2:54 AM, sharat varma <[email protected]> wrote: >>> >>>> Hi Jack, >>>> >>>> Thanks for the reply. >>>> >>>> I did not run mmcm calibration. Actually, we checked the ADC by feeding >>>> it a low frequency sine wave from a function generator and it works fine. >>>> >>>> The problem with spikes occurs when we feed the ADC with the >>>> photo-detector output. >>>> >>>> Regards, >>>> Sharat >>>> >>>> >>>> On 1 September 2015 at 13:52, Jack Hickish <[email protected]> >>>> wrote: >>>> >>>>> Hi Sharat, >>>>> >>>>> Are you running the adc mmcm calibration routine after programming >>>>> your roach? >>>>> >>>>> Cheers, >>>>> Jack >>>>> >>>>> On 31 August 2015 at 22:41, sharat varma <[email protected]> wrote: >>>>> >>>>>> >>>>>> Hi Casper, >>>>>> >>>>>> I am working as a post-doc working under guidance of Dr. Hayden So at >>>>>> The University of Hong Kong. >>>>>> >>>>>> We are using ROACH2 to capture data from optical cytometry. We are >>>>>> using ASIAA ADC5G ADC to capture data at 4 to 5 Gsps. >>>>>> >>>>>> We basically use the following parameters. >>>>>> >>>>>> Block parameter: two-channel, ZDOK0, demux 1:1 . >>>>>> System: roach2, clock source:adc0_clk, clock rate: 300 MHz. >>>>>> >>>>>> We are connecting the output of a photo-detector 1544-B from Newport >>>>>> Corp (the spec is attached) to the ADC input using SMA. >>>>>> We find that noisy spikes are introduced when we capture the data >>>>>> through the ADC (see attached fig). We double checked if the source had >>>>>> problems using a oscilloscope, but on the oscilloscope we do not see any >>>>>> of >>>>>> these spikes. >>>>>> >>>>>> We would be grateful if you could let us know if we are doing >>>>>> anything wrong. >>>>>> >>>>>> Rgards, >>>>>> Sharat >>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >>
