Project demonstrates parallel data transfer from Raspberry Pi3 to FPGA board Marsohod2RPI via GPIO pins.
40Mbytes/sec achieved.
16bit data bus, one GPIO4 pin as a strobe, one GPIO2 pin as a read request.
More about project here: https://marsohod.org/projects/m2rpi-projects/366-rpi3-to-m2rpi
More about board: https://marsohod.org/howtostart/m2rpi