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 >> > >
