220.127.116.11.2.2 Combining Three Chip-Selects with One 128-Megabyte Flash
The other use case is when the memory requirement exceeds 64-megabytes. In this case, a single flash device up to 128-megabytes can be used. Figure 7-14 shows a block diagram describing how to combine CS0, CS1, CS2, GPIO45, and GPIO46 with the required external logic gates and the connections between the DLPC900 and the flash component.
Figure 7-14 One 128-Megabyte Flash Component
Flash devices that are larger than 128-megabytes can also be used with the DLPC900, but the DLPC900 is only capable of accessing 128-megabytes. The other sectors within the flash device will go unused.
Note: GPIO45, GPIO46, and GPIO60 are exclusively used by the DLPC900 as extended flash address lines. These GPIO are not to be utilized for any other purpose.