for Non GPIO sync direct into the Roach2 https://casper.berkeley.edu/wiki/ROACH-2_Revision_2#Usage_Manuals.2C_Guides.2C_Memos.2C_etc.
this includes a number of measurements if happen to have 1 source driving multiple loads. https://casper.berkeley.edu/wiki/16_way_1PPS_driver On Wed, Aug 6, 2014 at 5:38 PM, Dan Werthimer <[email protected]> wrote: > > hi josh, > > we usually inject the 1 PPS "sync signal" into the SMA sync input > on one of the casper adc boards, which plugs into the roach2. > > however, as you point out, you can also inject sync directly into the J10 > SMA > input on the roach2. J10 is DC coupled, and set up to receive a 1 PPS > signal. > > we typically use (for either ADC sync, or roach2) a standard 1 PPS pulse > distribution > box that has a 50 ohm output impedance and delivers a 0 to 2.5 volt pulse > when > it's output is terminated in 50 ohms (both the roach2 and and adc board sync > inputs > terminate in 50 ohms). (note: this is 0 to 5 volts if you don't > terminate the output). > > have fun with 1 PPS, > > dan > > > On Wed, Aug 6, 2014 at 2:08 PM, Josh Sypherd <[email protected]> wrote: >> >> Hi everyone, >> For the sync input on the ROACH 2 GPIO the CASPER website says that it >> requires a pulse per second, but we are unsure what amplitude, pulse width, >> ect. we need for it to function. >> Thanks, >> Josh > >
