The TMS28F033 contains 4M bits of main memory that is user-configurable as either three or four independently erasable blocks. In addition to the main memory array, there is a protected overlay memory block that is normally hidden from the memory address map. The following table shows the three- and four-block main-memory-array configurations for both 16-bit and 32-bit data bus widths. Table 1. Memory Configurations DATA BUS WIDTH