Mining: GetWork, Get Nonce, ???, Submit Hash?
In KC705_experimental, the readme says the device should return 0E33337A and two other results. It just so happens the bit of test work described in the readme has three different solutions to it.  A mining script should return all three solutions to the server.

fpgaminer, the author of the KC705_experimental code, has written an addon for the Modular Python Bitcoin Miner project (MPBM) to mine using KC705 hardware.  If writing your own mining script you may want to refer to his work.  You can find more information here:  https://bitcointalk.org/index.php?topic=9047.msg2019538#msg2019538