Users can determine how many CY7C964s are needed to complete their interface by determining which address and data transactions will be supported. 5 pF on inputs. 7 pF on outputs. 13 pF on bidirectional signals. One longword can be write posted from either side.
Metastability is a problem with all asynchronous, clocked designs.
The output of the clocked element is unpredictable. It may be driven to a valid output level or even oscillate. Eventually the output will settle to a valid level, but the settling time may also be unpredictable. There are several ways to combat metastability problems. Two clocked elements are placed, in series, in the signal path.