hi ZHANG Laiyu, from rick, who designed that ADC board:
"The ADC produces full-parallel data at 550 or 400MHz DDR, so the ADC core would normally run at half of this- I don't see any reason to run it slower. I can't remember who did the yellow block; I have code that runs on a mini-roach for testing these. Rick" On Wed, Oct 21, 2020 at 2:21 AM zhang laiyu <zhan...@ihep.ac.cn> wrote: > Hi,all > > I use ROACH2 and MKID ADC-4x board(2*ADS54RF63) to acquire data and > send it through 10Gb to computer. > > I use adc_mkid_4x yellow block in the firmware. > > Now,I can get data from 10Gb . But I found that the data package have > repeated data. When I input the ADC_I with 100KHz sine signal (Vpp is > 200mv). I can get the curve,but is not very correct.From the raw data, I > fount every 8 data(12bits),exist 4 point was same. datapackage like: > d1d2d3d4d1d2d3d4d5d6d7d8d5d6d7d8....It sames that the FPGA's clock is 1/2 > of ADC clock. When I modified the firmware,replace the adc yellow block > with counters,I can get right data. There are not repeat data. So I > suspected that the FPGA's clock is 1/2 of MKID-ADC clock. > > From MKID ADC boad schematic design，the clock send to FPGA is 1/2 ADC > clock. But from the mail list and other papers,I got that the clock rate > of FPGA should be 1/4 ADC clock generated by adc_mkid_4x yellow block. > > Anyone can give me some help or suggestion? Attachment is firmware > and one test result curve. > > Thanks. > > > > > > > Cheers! > > >------------------------------------------------------------------------ > ZHANG Laiyu > Phone(China) 010-88233078 > Cellphone(China) 13681385567 > E-mail: zhan...@ihep.ac.cn > Address: 19B Yuquan Road,Shijingshan District,Beijing，China > Department: Center for Particle Astrophysics > Office: Astrophysics Building 205 > > Institute of High Energy Physics, CAS > web: http://www.ihep.cas.cn <http://www.ihep.ac.cn/> > > >------------------------------------------------------------------------ > > > > > > > > > > > > > > > > > > > > > * <zhan...@ihep.ac.cn>* > > > <http://isdc.unige.ch/~produit> > > -- > You received this message because you are subscribed to the Google Groups " > casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/385ac38a.2cdee.1754a768364.Coremail.zhangly%40ihep.ac.cn > <https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/385ac38a.2cdee.1754a768364.Coremail.zhangly%40ihep.ac.cn?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAGHS_vEDxSGw7q2z%3D_x3%2B62ouUcXmRnN0B4P6oyAR_4Od3ttHg%40mail.gmail.com.
