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 used for any other purpose.