All external memory devices must be checked for their timing when connecting them to a micro. This check is made by timing designer program such as Chronology or by making some calculation on a white paper.
At the end of any data sheet there’s a timing diagrams. For write cycle, you need to take the write cycle diagram from the micro’s data sheet and the read cycle diagram from the memory device and to check if the data on the memory is valid according to those diagrams. You need to do the same for micro’s read access.
Do those checks for various access times and see if you have any problem (data not valid) in some of the cases.
This is in general. In specific, it’s very important to know what micro you are using and also what type of memory device.

Hope it help you,
Hosman Roberto.