TMP92FD54AI datasheet(58/84 Pages) TOSHIBA

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92FD54AI-58

2006-01-27

TMP92FD54AI

7) Auto Block Protect

Auto Block Protect allows individual blocks to be protected from being written or

erased. The table below shows the relationship between protection status and the

rewrite operation.

Table 4.4.2 Block protection status and the Rewrite operation

Protection Status and Operation Executed

Result of executed operation

Execute Program on protected block

Not programmed and automatically returns to Read Mode

Execute Erase on protected block

Not erased and automatically returns to Read Mode

Execute Chip Erase when all blocks are protected

Not erased and automatically returns to Read Mode

Execute Chip Erase when any blocks are protected

Only the unprotected blocks are erased. Upon completion,

the flash memory automatically returns to Read mode

Writing to the protect circuit is initiated by the address of the block to be protected

in the sixth Bus Write cycle of the command sequence, and set data to “70H”. (see

Figure 4.4.8)

During automatic operation no other command sequence input can be accepted. To stop

operation use a hardware reset.

When it erases Auto Block Protect, use Auto Chip Erase & Unprotect command.

(see Table 4.4.3) In this case it erases all Auto Block Protect and all blocks of the

flash memory.

8) Verify Block Protect

Verify Block Protect is used to check whether or not blocks are protected. Enter the

address of the block you want to check in the fourth Bus Read cycle of the

command sequence. At this time, specify an address where A3 = A6 = 0, A4 = 1, and

read the selected block in units of long words. If the block is protected, the data

returned will be 00000001H. Conversely, if the block is unprotected, the data

returned will be 00000000H.

To continue verifying the protection of other blocks, it is only necessary to

repeating the fourth Bus Read cycle so as to read out data from each block. Change

the block address as desired and read the data out in long words. To return to

Flash Memory Read or any other command input after the Verify Block Protect

has been completed, it is necessary to issue a Read/Reset command or a hardware

reset.

9) Hardware Sequence flags (see Table 4.4.6)

The status of automatic execution of operations on flash memory can be checked by

inspecting the Hardware Sequence flags. During automatic operation data can be

read out with the same timing as that of Read Mode. The flash memory

automatically returns to Read Mode after automatic operation has finished.

During automatic execution it is possible to monitor the operating status by

inspecting the Hardware Sequence flags. After automatic operation has finished,

the operating status can be confirmed by checking the read data to see that it

matches the cell data.

To inspect the Hardware Sequence flags during an Auto Program operation,

specify the same address as the one which has been set by the rewrite routine (in

which A0 = A1 = 0) at the same time as reading out the flag. Also, to inspect the

Hardware Sequence flags during an Auto Erase operation, specify an address in

which A0 = A1 = 0 at the same time as reading out the flag.

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