29.2.1.2 Physical Memory

RWW EEPROM emulator is divided into a number of physical rows, each containing four identically sized pages. Pages may be read or written to individually, however, pages must be erased before being reprogrammed and the smallest granularity available for erasure is one single row.

This discrepancy results in the need for an emulator scheme that is able to handle the versioning and moving of page data to different physical rows as needed, erasing old rows ready for re-use by future page write operations.

Physically, the emulated RWW EEPROM segment is a dedicated space that are memory mapped, as shown in Figure 29-1.