>Due to propagation delays, the result is some flops latch a value
>which is a result of the flag being high and other flops latch in
>a value which is a result of the flag being low. The end result
>is the state machine jumps to an undetermined state, VERY bad! :)
>
>Even worse, metastability can also occur, which is an oscillation
>of the output of a flop for a significant period of time, even
>longer then a clock period.
>
>To reduce the chances of these problems a classic solution is to
>"double flop" asynchronous nets, virtually turning the asynchronous
>nets into synchronous ones that don't violate setup and hold times.
...
>Hope that made sense! TTYL

Yep, thanks. I wasn't sure just what you were meaning, but understand the 
reason for getting around the setup time requirements for async signals. 

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