Hi,
Divide by one means "no operation at all"
Output = input
Useless function
For such a useless function you may use a
* buffer
* AND gate (both inputs tied together)
* OR gate (both inputs tied together)
... or several other non clocked solutions.
But not with a "clocked" solution like a DFF.
The problem is that a DFF can react on one clock edge only (either rising or falling).... thus it can not react on the other edge.
But for a "divide by one" you need to react on both incoming edges. Impossible.
Klaus