Why is rising edge preferred over falling edge
Flip-Flops(,Registers ...) are usually triggered by a rising or falling edge. But mostly in code you see an if-clause which uses the rising edge triggering. In fact i never saw a code with falling edge.
Why is that? Is it because naturally the programmers use rising edge, because they are used to, or is it because of some physical/analog law/fact, where the rising edge programming is faster/simpler/energy-efficient/... ?
Answer
As zennehoy says, it's convention - but one going back to when logic was done in discrete chips with a few gates or flipflops within them. Those packages of flipflops were always rising-edge triggered...as far as I recall, but maybe someone with better recollection of the yellow books will correct me!
So when synthesis came along, no doubt everyone felt comfortable carrying on that way!