Mysterious FPGA board

[Rasz]

Billable to who?

The older you get the more precious your time becomes. If your hobby is reverse engineering old random dev boards then more power to you! I suspect most people would like to actually use fpga rather than spend weekends investigating pcb connections.

If this was $500 FPGA chip situation would be totally different, but $35 gets you fully documented board from china with same spartan.

[migry]

I was given one of these boards, and a little information.

I am told that the 14 way connector is for JTAG and apparently is a Xilinx standard. I googled for "xilinx fpga cable" and I got 3 hits on Ebay, whose pictures show the small 14 connector. One cheap £20 programmer shows an adapter board. My programmer would need an adapter cable.

All pins of the 32 pin connector connect to GPIO pins on the FPGA. Just a quick idea. If you can get JTAG to connect, then you could in theory use the boundary scan chain to toggle all I/O pins, one by one, and by this tedious method find out the mapping of these pins to Xilinx I/O pads. This same method could be used to figure out the wiring of the FPGA to the SRAM chip too. Tedious but do-able.

Power is via the 60 pin(?) Samtec connector on the bottom. Any ideas if you can buy a matching breakout board? The 3 small square ICs to the right of the DIP switches are the regulators. It's not obvious where to connect the power 

[alin_im]

It has some test pins with the required voltages that are needed to power the board. I hope they can be visiblein the photos.