How do you find out the flaw, which of the address getting written wrongly.
Fill the full memory once with either random data or sequential data then after filling totally read the data from the memory. Compare the write data and read data, you can search the location if the data mismatches.
Consider an example address decoder which is mapping the transactions to the dissimilar memories. Let us suppose there is bug in the address decoder when accessing the 256 byte memory. Whenever we require to write the data to the address location AA it is getting written to the location BB.