On Sunday, April 10, 2016 at 9:04:06 PM UTC-5, Dennis Lee Bieber wrote: > > On Sun, 10 Apr 2016 09:23:13 -0700, evilwulfie > <[email protected] <javascript:>> declaimed the > following: > > > > >Maybe raw parallel data between the BBBs using GPIO pins. > > > > I hadn't visualized that, but for one-way traffic... If a PRU can > get > access to 17 GPIOs, 16 of them adjacent, loading the adjacent 16 of them > with two bytes of data, then toggling the 17th as a data strobe, might be > feasible. Say a 50MHz net rate for loading 16-bit data and setting strobe > (~4 PRU instructions), end rate 800Mbps. Highly dependent on being able to > transfer 16-bit from memory to GPIO without needing to shift left/right... > > Nope, they do not have 17 fast GPIOs out of one PRU or into another PRU. They do give you 8, however, which OUGHT to be enough. You could clock 8 bits across at insane rates. Probably 40 MHz is not unreasonable. Just give a clock cycle to allow data to settle, sample it and send acknowledge to the sender.
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