Toshiba TLCS-900/H1 Series Manual page 447

(3) Data format
The download data consists of the boot identification code (4 bytes), user program
size (2 bytes) and user program (max 10 Kbytes). These should be assigned
(programmed) to NAND flash as shown in Figure 3.21.5. Also program the ECC code in
the redundant area of the NAND flash, the block status area and thedata status area .
Address: 0 1
Page 0
Page 1
Block 0
Page end
Page 0
Page 1
Block 1
Page end
Page 0
Page 1
Block end
Page end
NAND flash program image (Physical)
a) Boot identification code (4 bytes)
The boot program initially checks the boot identification code. If the boot
characters in ASCII code are read from the first 4 bytes in page 0, block 1 of the
NAND flash, the boot program will recognize the boot method as NAND flash.
b) User program size (2 bytes)
The program size should be programmed to the next 2 bytes. The first byte is
the lower 8 bits and the second is the upper 8 bits. This size indicates only the user
program size; it does not include the boot identification code (4 bytes) and user
program size (2 bytes).
This must be less than or equal to 10 Kbytes. So, the maximum number is
2800H.
511 (or 255)
Figure 3.21.5 Download Data Image
42H ("B")
4FH ("O")
4FH ("O")
54H ("T")
Figure 3.21.6 Boot Identification Code
Size (Lower 8 bits)
Size (Upper 8 bits)
Figure 3.21.7 User Program Size
92CH21-445
Boot identification
code (4 bytes)
User program size
(2 bytes)
User program
(Max 10 Kbytes)
Download data assignment image
TMP92CH21
: Download data
2009-06-19