[casper] sync ADCs in ROACH2

2015-01-29 Thread Franco
Hi CASPER community, I'm working with ROACH 2 and I need to synchronize the two ADC so that both take samples at the same instant of time. Does anybody know how can I achieve this synchronization? I've noticed that that the Simulink block model for these ADCs (adc5g), doesn't have the option of us

Re: [casper] sync ADCs in ROACH2

2015-01-30 Thread Jack Hickish
Hi Franco, The sync inputs are usually used to synchronise multiple boards. If you feed an lvttl signal into the sync input of the adc5g, it will emerge from the sync output of the yellow block. Usually people drive this signal with a pulse per second signal from a GPS, and use the resulting simul

Re: [casper] sync ADCs in ROACH2

2015-01-30 Thread Jack Hickish
PS: if you're trying to interleave two ADCs, I would imagine regardless of getting the samples in sync, for best results you would need to implement a way to calibrate <<1 sample offsets anyway, which might mandate some signal injection system anyway... Though I've never tried to do this, so really