you wrote 64MB. So 64MBytes?
I don´t recommend to say so. Because the data width is no "full byte". Your data width is just 4 bits.
So you need two chips to get a full byte (seen from data width)
Use the other chip: 16M x 8 x 4 banks to get true 64MBytes
The datasheet tells it's size. My question is if they give something like this 32 Meg x 4 x 8 Banks.
How to arrive that size value which is mentioned in the datasheet
you wrote 64MB. So 64MBytes?
I don´t recommend to say so. Because the data width is no "full byte". Your data width is just 4 bits.
So you need two chips to get a full byte (seen from data width)
Use the other chip: 16M x 8 x 4 banks to get true 64MBytes
512 Mb (Megabit) is already written in the first datasheet line. If you have any doubts what this means, you would read the "General Description" paragraph following on the next pages.