Honored Contributor
Honored ContributorPlacing the FFs close together shortens the path time between them. The clock period is of course fixed so the time between clocks is the META time plus the signal propagation time cannot be longer than the clock period or the input to the second FF will not be stable.
So path time = META time + propagation time and the shorter propagation time allow more time for META to resolve. clk.............|--|...........|--|.... input..........|------------------- META.........|---------|......... prop.......................|--| FF2.............................|-----
