39.7.1 External Memory Mapping

The EBI provides up to 24 address lines, A[23:0]. This allows each chip select line to address up to 16 Mbytes of memory.

If the physical memory device connected on one chip select is smaller than 16 Mbytes, it wraps around and appears to be repeated within this space. The EBI handles any valid access to the memory device within the page, as shown in the following figure.

The LSB of A[23:0], A0, is only significant for 8 bit memories and not used for 16bit bit wide memories, A[23:1].