but they literally power all (full) adders in same time...
They step the simulation with F and try to get the timing right manually :P Subframe is better in this aspect; there's no timing there, everything happens in every frame.
just a single question: how people synchonize it without DLAYs or smth?
But remember that this deals with binary.
This is a logic diagram. Actually I have not yet experience dealing with XOR and XAND gates, so to truly comprehend this, I must look into their effects on given inputs.
can you explain a little more? for example on adders with a larger bitwise rather than 1.