Alexander Lang has posted another tutorial on his blog http://langster1980.blogspot.co.uk describing how to use a soft processor on Mimas V2 Spartan 6 Development board to implement Arduino compatibility on Spartan 6 FPGA. The tutorial can be directly accessed at the link below. http://langster1980.blogspot.co.uk/2015/11/arduino-soft-processor-on-mimas-v2-fpga.html A big thanks to Alexander for posting this tutorial.