TC58FVM5B3AXB65 datasheet(14/63 Pages) TOSHIBA

14 / 63 page

TC58FVM5(T/B)(2/3)A(FT/XB)65

2003-01-29 14/63

Hidden ROM Area

The TC58FVM5T2A/B2A/T3A/B3A 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 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 for BANK3 in top boot type and for BANK0

in bottom boot type.

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

TC58FVM5T2A

TC58FVM5T3A

TOP BOOT BLOCK

3F0000h~3FFFFFh

64 Kbytes

1F8000h~1FFFFFh

32 Kwords

TC58FVM5B2A

TC58FVM5B3A

BOTTOM BOOT BLOCK

000000h~00FFFFh

64 Kbytes

000000h~007FFFh

32 Kwords

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