TCC720 Datasheet, PDF (137/143 Pages) List of Unclassifed Manufacturers – 32-bit RISC Microprocessor For Digital Media Player

TCC720
32-bit RISC Microprocessor for Digital Media Player
Dec. 16. 2002
BOOTING PROCEDURE
Preliminary Spec 0.51
The procedure of booting from NAND flash is displayed in figure 14.4
Device code reading & Mode Setting
(Bus width = 8bit, CADR register setting)
N = last page number
Read 2nd byte in spare data of page N
N=N-1
Data == 0xC4 ?
No
Yes
Copy (SIZE - 4) bytes from NAND to SRAM
JUMP to SRAM (0x00000000)
N = Register R0
Initialization &
Customization code
is executed.
It may or may not
return to boot ROM
Read (SIZE - 8) bytes from NAND
Yes
Encrypted ?
No
Copy (SIZE - 8) bytes to Memory
(starts from 0x00000000, can be SDRAM, SRAM
by setting the base register of memory controller)
Decrypt data
Read the next page number N
No
N == 0xFFFFFFFF ?
Yes
Jump to 0x00000000
Figure 14.4 NAND boot procedure
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