TC58FVT160/B160AFT/AXB-70,-10

2002-08-06

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Hidden ROM Area

The TC58FVT160/B160A 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. 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

released, even using the temporary block unprotection function. Use Block Protect carefully.

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

BYTE MODE

WORD MODE

TYPE

BOOT BLOCK

ARCHITECTURE

ADDRESS RANGE

SIZE

ADDRESS RANGE

SIZE

TC58FVT160A

TOP BOOT BLOCK

1F0000H~1FFFFFH

64 Kbytes

F8000H~FFFFFH

32 Kwords

TC58FVB160A

BOTTOM BOOT BLOCK

000000H~00FFFFH

64 Kbytes

000000H~007FFFH

32 Kwords