Thanks for the responses! Is there a convenient way to get around the unidirectional IO restriction on ROACH?
-Alex On Fri, Mar 8, 2013 at 1:27 AM, Andrea Mattana <[email protected]> wrote: > We have used at least as output signals where we have connected > additional LED, but never used as input trigger. > > Andrea > > > 2013/3/8 John Ford <[email protected]>: > >> Does anyone have any input on trying to use the GPIO A and B headers for > >> very simple inter-ROACH direct FPGA to FPGA communication? I'm know that > >> ROACH supports this sort of thing using 10 gbe, but for conveying > trigger > >> pulses, this (to my rather casper-naive intuition) seems simpler and > >> cheaper, with lower latency. > > > > The design for the GBT VEGAS machine uses this sort of communication for > > synchronizing the roach boards to a telescope switching signal. we > > designated one as the master and propagate the signals over the GPIO pins > > to the slaves. Seems to work for us. > > > > You can use the gpio yellow blocks for the interface, as long as you > don't > > need a bidirectional pin. > > > > John > > > > > >> > >> Any thoughts? > >> > >> -Alex > >> > > > > >
