I hope the BitFury chip has a more flexible design. Addressable registers using SPI like flash memory would be ideal. Then you just update the data you need for each work unit. Nonce ranges and operating parameters like clock cfg can be set once and left. Most current micro-controllers have hardware support for that.
Not to sidetrack this thead but has anyone seen any datasheet on the BitFury chips? I seen they were for sale but no real data sheet on them as of yet. Good to see your hashing at full speed. I know a lot of people following this are set on overclocking. I wonder if there could be a way to get a larger range than just 60Mhz of signal capture other than just replacing the cap depending on your desired frequency?