Toshiba TLCS-900/H1 Series Manual page 148

3.8 External Memory Extension Function (MMU)
By providing 3 local areas, the MMU function allows for the expansion of the program/data
area up to 512 Mbytes.
The recommended address memory map is shown in Figure 3.8.1 and Figure 3.8.2.
However, when the memory used is less than 16 Mbytes, it is not necessary to set the MMU
register. In this case, please refer to the Memory Controller section.
An area which can be set as a bank is called a local area. Since the address for local areas is
fixed, it cannot be changed.
It is not possible for a program to branch between different banks of the same local area.
The TMP92CH21 has the following external pins for memory LSI connection.
Address bus: EA25, EA24 and A23 to A0
Chip select:
Data bus: D31 to D0
3.8.1 Recommended Memory Map
Figure 3.8.1 shows one recommended address memory map. This is for maximum
expanded memory size and for a system in which an internal boot ROM with NAND flash is
not needed.
Figure 3.8.3 also shows a recommended address memory map for a simple memory
system such as an internal boot ROM with NAND flash and SDRAM.
to , to
CS0 CS3 CSZA CSZF
92CH21-146
, and
SDCS ND0CE ND1CE
TMP92CH21
2009-06-19