TMP92FD54AI datasheet(59/84 Pages) TOSHIBA

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92FD54AI-59

2006-01-27

TMP92FD54AI

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DQ7 (Data Polling)

The Data Polling function allows confirmation of the status of automatic

operations on flash memory. Data polling output begins after the last Bus

Write cycle of an automatic operation command sequence has ended. During

an Auto Program operation the data written to DQ7 is output after being

inverted. After an Auto Program operation, the cell data for DQ7 itself is

output so that the operation status can be identified by reading DQ7. During

an Auto Erase operation the data 0 is output on DQ7; after an Auto Erase

operation the data 1 (the cell data) is output on DQ7. If an automatic operation

resulted in an error, DQ7 will continue to output the data it held during the

automatic operation. Therefore, this data can be used in combination with the

value on DQ5 (the internal timer-out) to determine whether failure has

occurred (see Figure 4.4.6).

Since the flash memory releases the address latch on completion of operation,

to read out data it is necessary to specify either the address to which data has

been written or the address of any unprotected erased block.

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DQ6 (Toggle bit)

The Toggle bit function, same as the data polling function, allows confirmation

of the status of automatic operations on flash memory. The Toggle output

begins after the last Bus Write cycle of an automatic operation command

sequence has ended on DQ6. Every read cycle, output reciprocally 0 and 1. If

an automatic operation resulted in an error, DQ6 will continue to output the

data it held during the automatic operation. Therefore, this data can be used

in combination with the value on DQ5 (the internal timer-out) to determine

whether failure has occurred (see Figure 4.4.6).

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DQ5 (internal time-out)

Normally when automatic operation is in progress, the flash memory outputs

0 on DQ5. If the automatic operation exceeds the flash memory’s internal

time-out period, the DQ5 output will change state to 1. This indicates that

automatic operation did not terminate normally and suggests that the flash

memory may be faulty. Furthermore, since the flash memory can have its cells

changed from data 1 to data 0 in Program Mode, but cannot have its cells

changed from data 0 to data 1, if an attempt is made to write a data 1 to a data

0 cell, the device will not be able to write data correctly within the

predetermined time. As a result, the device will output a 1 on DQ5, just as if

the flash memory were found to be faulty.

In this case the value on DQ5 is not indicating that the flash memory is faulty,

but that an attempt to perform an invalid operation was made. If automatic

operation did not terminate normally, the flash memory will be locked and will

not re-enter Read Mode. Therefore, reset the flash memory using the Reset

command.

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DQ3 (Block Erase timer)

Auto Block Erase starts the Block Erase Hold time after the sixth Bus Write

cycle of the Command cycle has ended. The flash memory outputs a 0 on DQ3

during the Block Erase Hold time and outputs a 1 when it starts an Erase

operation.

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