TMP92FD54AI datasheet(57/84 Pages) TOSHIBA

57 / 84 page

92FD54AI-57

2006-01-27

TMP92FD54AI

Protected blocks, if any, cannot be erased. If all blocks are protected, the device will

not execute Auto Chip Erase but will enter Read Mode.

In this case, the deletion operation other block of the following number of the

protected block will be excuted.

If Auto Chip Erase terminates normally, the device will automatically re-enter

Read Mode. If Auto Chip Erase terminates in error, the flash memory will be

locked in that mode and will not re-enter Read Mode. The status can be checked by

inspecting the Hardware Sequence flag.

To return to Read Mode, it is necessary to reset the flash memory or the device

using the Reset command or a hardware reset. In this case it will be impossible to

detect which block generated the error. Therefore, it is recommended that the bad

block be located using the Block Erase function and that henceforth use the bad

block not be used.

6) Auto Block Erase

An Auto Block Erase starts the Erase Hold time after the sixth Bus Write cycle of

the Command cycle has ended. Once it has started, all flash memory addresses in

the selected block are automatically programmed to 0; this is followed by the

execution of Erase and Erase Verify.

If any command sequence other than an Auto Block Erase is entered during the

Erase Hold time, the flash memory will be reset and will enter Read Mode. The

status of an Auto Block Erase operation can be checked by monitoring the

Hardware Sequence flags (see Table 4.4.6). During an Auto Block Erase operation,

the device cannot accept any command sequences input. To stop operation, use a

hardware reset. Note that in this case, data cannot be erased correctly, and hence

the Auto Block Erase must be re-executed.

Protected blocks, if any, cannot be erased. If all blocks are protected, the device

will not execute Auto Block Erase but will enter Read Mode. If Auto Block Erase

terminated in error, the flash memory will be locked in that mode and will not

re-enter Read Mode. The status can be checked by inspecting the Hardware

Sequence flag. To return to Read Mode, it is necessary to reset the flash memory or

the device using the Reset command or a hardware reset.

TMP92FD54AI データシート(PDF) 57 Page - Toshiba Semiconductor