Toshiba TLCS-900/H1 Series Manual page 125

(2) Note on NAND flash area setting
Figure 3.6.5 shows a memory map for a NAND flash and RAM built-in LCD driver.
Ssince it is recommended that CS3 area be assigned to the address 000000H to
3FFFFFH, the following explanation is given.
In this case, the NAND flash and RAM built-in LCD driver overlap with CS3 area.
However, each access control circuit in the TMP92CH21 operates independently.
So, if a program on CS3 area accesses NAND flash, both
be accessed at the same time and a problem such as data conflict will occur.
To avoid this phenomenon, it is recommended that CS0 area be assigned to the 32
Kbytes of address 000000H to 007FFFH as the
Since CS0 has priority over CS3, only NAND flash will be accessed correctly by this
setting.
Note: In this case, the 32 Kbytes of address 000000H to 007FFFH in CS3's memory
cannot be used.
000000H
001D00H
001F00H
001FE0H
001FF0H
002000H
006000H
008000H
200000H
400000H
Figure 3.6.5 Recommended CS3 and CS0 Setting
Internal I/O
NAND flash
(512 bytes)
( )
Not assigned
RAM built-in LCDD (16 bytes)
Internal RAM
(16 Kbytes)
COMMON X
(2 Mbytes)
LOCAL X
(2 Mbytes)
92CH21-123
and NAND flash will
CS3
pin will not be needed.
CS0
CS0 area setting 000000H to
007FFFH (32 Kbytes)
CS3 area setting 000000H to
3FFFFFH (4 Mbytes)
TMP92CH21
2009-06-19