TH50VSF2582 Datasheet, PDF (26/50 Pages) Toshiba Semiconductor – SRAM AND FLASH MEMORY MIXED MULTI-CHIP PACKAGE

Hidden ROM Area
TH50VSF2582/2583AASB
The TH50VSF2582/2583AASB features a 64-Kbyte hidden ROM area which is separate from the memory
cells. The area consists of one block. Data Read, Write and Protect can be performed on this block. Because
Protect cannot be released, once the block is protected, data in the block cannot be overwritten.
The hidden ROM area is located in the address space indicated in the HIDDEN ROM AREA ADDRESS
TABLE. To access the Hidden ROM area, input a Hidden ROM Mode Entry command. The device now enters
Hidden ROM Mode, allowing Read, Write, Erase and Block Protect to be executed. Write and Erase operations
are the same as auto operations except that the device is in Hidden ROM Mode. However, regarding write
operation, Accelaration mode can not be performed during Hidden ROM mode. To protect the hidden ROM area,
use the block protection function. The operation of Block Protect here is the same as a normal Block Protect
except that VIH rather than VID is input to RESET . Once the block has been protected, protection cannot be
released, even using the temporary block unprotection function. Use Block Protect carefully. Note that in
Hidden ROM Mode, simultaneous operation cannot be performed. Therefore, do not attempt to access areas
other than the hidden ROM area.
To exit Hidden ROM Mode, use the Hidden ROM Mode Exit command. This will return the device to Read
Mode.
HIDDEN ROM AREA ADDRESS TABLE
TYPE
BOOT BLOCK
ARCHITECTURE
BYTE MODE
ADDRESS RANGE
SIZE
TH50VSF2582AASB TOP BOOT BLOCK 3F0000H~3FFFFFH
TH50VSF2583AASB BOTTOM BOOT BLOCK 000000H~00FFFFH
64 Kbytes
64 Kbytes
WORD MODE
ADDRESS RANGE
SIZE
1F8000H~1FFFFFH
000000H~007FFFH
32 Kwords
32 Kwords
2001-10-25 26/50