just a optimision, from a noob:
is it possible in sha256_transform.v to remove the generate loop, and replace it with some sort of pipelining instead, it will from what i can understand make the code smaller, but have a greater delay. and with smaller code you could have more of them on a single board, and a higher clockspeed.

am i talking gibberish, or do i have something right?
its was all from what i could learn from the internet in about 5 hours. Smiley

i just think it would be an improvement