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 6-14 shows a block
diagram describing how to combine CS0, CS1, CS2, GPIO_45, and GPIO_46 with the required
external logic gates and the connections between the DLPC900 and the flash component.
Note:
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: GPIO_45, GPIO_46, and
GPIO_60 are exclusively used by the DLPC900 as extended flash address lines. These
GPIO are not to be utilized for any other purpose.