Basically, I'm referring to this thread: http://forum.bitcoin.org/index.php?topic=9047.240

But since I'm no "established user", I have no way to ask there.

Does anyone know, how Megahashs/second are counted?

I had a very close look at his FPGA-Miner source-code and i couldn't figure out how he calculated this value.

Basically, for SHA256 64 rounds of the compression-function has to be calculated and even with loop unrolling depth of 6 or 8 it takes at least clock/depth clock cycles to complete one hash ...

Could someone please explain?

Alternatively, how do I become an "established user"?

All the best,
mnemonix