RaspFPGA mezzanine board for Raspberry Pi

I present to you an extension card for Raspberry Pi. This circuit connects all GPIO pins of Raspberry Pi to Spartan3 FPGA chip and leaves all remaining inputs/outputs pins of FPGA for the final user. I used Spartan3AN chip which can be configured from internal flash memory at start up or by SPI from Raspberry Pi.

The circuit is mechanically and electrically compatible with LCD TFTDisp 4 RaspPAR design published on my blog in March. It contains 25MHz clock source for FPGA, USB to RS232 converter and real time module. I share this piece of hardware with community as OpenHardware.

RaspFPGA-E6 v1.1_4MBEcho.zip