Hi, Delivering a clock of 960 MHz to the ADC card and programming the 4 ADC ICs to divide that clock by two would work as well. Matt
On Wed, Mar 9, 2016 at 9:49 AM, David MacMahon <dav...@astro.berkeley.edu> wrote: > Hi Vishwa, > > I am not at my computer right now, so this is from memory, but I think you > want to specify an IP clock rate of 240 MHz and supply a 480 MHz clock to > the ADC card(s). The IP clock rate is sometimes called the fabric clock > rate. It is the rate at which the FPGA logic elements (aka fabric) operate. > The ADC chips need a sample clock that is commensurate with the sampling > frequency. When you initialize the ADCs using adc16_init.rb, be sure to > pass the "-d" option. If your version of adc16_init.rb does not support the > "-d" option, then you will need to update it. > > Hope this helps, > Dave > > On Mar 9, 2016, at 08:33, Vishwa Seneviratne <mp...@zips.uakron.edu> > wrote: > > Hi David/Jack, > > We are working on a beam former and we use the 'ADC16x250-8 coax rev 2' to > sample RF signals using ROACH2-Rev 2. The operating BW is 240MHz. Thus, we > need to sample the signals at 480 MSamples/s. We have few queries regarding > the adc16 yellow block and how to setup the input clock. > > 1. Can we compile a design by setting the IP clock rate to 480MHz? > 2. Should we supply a IP clock frequency of 480MHz to the ADC board to > achieve a sampling rate of 480MSamples/s. If not, at what clock rate > should we supply? And what other parameters needed to setup when running > the bof file. > > Thank you > > > Sincerely, > > > *Vishwa Seneviratne* > > *Graduate Student* > > *Dept. of Electrical and Computer Engineering* > *University of Akron* > > On Wed, Feb 3, 2016 at 12:38 PM, David MacMahon <dav...@astro.berkeley.edu > > wrote: > >> Hi, Vishwa, >> >> The software installed by following the ADC16 user guide had not been >> updated with the newer version of the adc16 code that supports demux mode. >> I have updated the software that the user guide points to, so if you >> reinstall the adc16 gem as per the user guide you should get version 0.4.0 >> which supports demux mode. >> >> Thanks for bringing this issue to my attention. >> >> Dave >> >> On Feb 3, 2016, at 7:02 PM, Vishwa Seneviratne <mp...@zips.uakron.edu> >> wrote: >> >> Hi Dave, >> >> Here is the output. >> >> vishwa@server3:~/Desktop/roach/poly$ adc16_init.rb -h >> Usage: adc16_init.rb [OPTIONS] HOSTNAME BOF >> >> Programs HOSTNAME with ADC16-based design BOF and then calibrates >> the serdes receivers. >> >> Options: >> -i, --iters=N Number of snaps per tap [1] >> -r, --reg=R1=V1[,R2=V2...] Register addr=value pairs to set >> -v, --[no-]verbose Display more info [false] >> -h, --help Show this message >> >> >> vishwa@server3:~/Desktop/roach/poly$ gem list adc16 >> >> *** LOCAL GEMS *** >> >> adc16 (0.3.6) >> >> >> >> >> Sincerely, >> >> >> *Vishwa Seneviratne* >> >> *Graduate Student* >> >> *Dept. of Electrical and Computer Engineering* >> *University of Akron* >> >> On Wed, Feb 3, 2016 at 11:28 AM, David MacMahon < >> dav...@astro.berkeley.edu> wrote: >> >>> What does "adc16_init.rb -h" show? What does "gem list adc16" show? >>> Maybe you need a newer version of the adc16 code. >>> >>> Dave >>> >>> On Feb 3, 2016, at 18:20, Vishwa Seneviratne <mp...@zips.uakron.edu> >>> wrote: >>> >>> Hi Jack, >>> >>> I'm thinking that the ruby script 'adc16_init.rb' does not identify the >>> '--demux' parameter. I used the code at 'git:// >>> github.com/david-macmahon/casper_adc16.git'. What can I do to set the >>> parameter? >>> >>> Thank you >>> >>> >>> Sincerely, >>> >>> >>> *Vishwa Seneviratne* >>> >>> *Graduate Student* >>> >>> *Dept. of Electrical and Computer Engineering* >>> *University of Akron* >>> >>> On Wed, Feb 3, 2016 at 11:02 AM, Vishwa Seneviratne < >>> mp...@zips.uakron.edu> wrote: >>> >>>> Hi Jack, >>>> >>>> I did try all the combinations. The error remains the same. >>>> >>>> $ adc16_init.rb -v --demux=1 192.168.10.5 poly_design.bof >>>> /var/lib/gems/1.9.1/gems/adc16-0.3.6/bin/adc16_init.rb:40:in `<top >>>> (required)>': invalid option: --demux=2 (OptionParser::InvalidOption) >>>> from /usr/local/bin/adc16_init.rb:19:in `load' >>>> from /usr/local/bin/adc16_init.rb:19:in `<main>' >>>> >>>> >>>> Sincerely, >>>> >>>> >>>> *Vishwa Seneviratne* >>>> >>>> *Graduate Student* >>>> >>>> *Dept. of Electrical and Computer Engineering* >>>> *University of Akron* >>>> >>>> On Wed, Feb 3, 2016 at 2:25 AM, Jack Hickish <jackhick...@gmail.com> >>>> wrote: >>>> >>>>> Hi Vishwa, >>>>> >>>>> Is the syntax definitely -demux=1 andnot either --demux=1 or -d 1 ? >>>>> >>>>> >>>>> Jack >>>>> >>>>> On Wed, 3 Feb 2016, 12:39 a.m. Vishwa Seneviratne < >>>>> mp...@zips.uakron.edu> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> I am working on how to work with different operating of >>>>>> the 'ADC16x250-8 coax rev 2' for a very simple design to test how the ADC >>>>>> works. The design is compiled at an IP clock rate setting of 200MHz. My >>>>>> objective is to sample my input signal at higher sampling rate >>>>>> (preferably >>>>>> 400, 800 MHz). >>>>>> >>>>>> According to the user guide '' >>>>>> https://casper.berkeley.edu/wiki/images/4/4c/ADC16_user_guide.txt"; >>>>>> by setting the demux parameter I should be able to switch between >>>>>> different >>>>>> sampling rates. I get the following error. >>>>>> >>>>>> $ adc16_init.rb -v -demux=1 192.168.10.5 poly_design.bof >>>>>> /var/lib/gems/1.9.1/gems/adc16-0.3.6/bin/adc16_init.rb:40:in `<top >>>>>> (required)>': invalid option: -demux=2 (OptionParser::InvalidOption) >>>>>> from /usr/local/bin/adc16_init.rb:19:in `load' >>>>>> from /usr/local/bin/adc16_init.rb:19:in `<main>' >>>>>> >>>>>> When I don't pass the 'demux' parameter the ADC board get initialized >>>>>> to 8 analog inputs by default. >>>>>> >>>>>> How do I resolve this issue? or how can I set the ADC's to operate at >>>>>> different sampling rates? >>>>>> >>>>>> Thank you in advance >>>>>> >>>>>> Sincerely, >>>>>> >>>>>> >>>>>> *Vishwa Seneviratne* >>>>>> >>>>>> *Graduate Student* >>>>>> >>>>>> *Dept. of Electrical and Computer Engineering* >>>>>> *University of Akron* >>>>>> >>>>> >>>> >>> >> >> >
