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14

EN29F080

Rev. C, Issue Date: 2001/07/05

toggling, the device has completed the program or erase operation. The system can read array data on

DQ7–DQ0 on the following read cycle.

However, if after the initial two read cycles, the system determines that the toggle bit is still toggling, the

sys-tem also should note whether the value of DQ5 is high (see the section on DQ5). If it is, the system

should then determine again whether the toggle bit is toggling, since the toggle bit may have stopped

toggling just as DQ5 went high. If the toggle bit is no longer toggling, the device has successfully

completed the program or erase operation. If it is still toggling, the device did not complete the operation

successfully, and the system must write the reset command to return to reading array data.

The remaining scenario is that the system initially determines that the toggle bit is toggling and DQ5 has

not gone high. The system may continue to monitor the toggle bit and DQ5 through successive read

cycles, determining the status as described in the previous paragraph. Alternatively, it may choose to

perform other system tasks. In this case, the system must start at the beginning of the algorithm when it

returns to determine the status of the operation (top of Flowchart 6).

Write Operation Status

Operation

DQ7

DQ6

DQ5

DQ3

DQ2

RY/BY

#

Embedded Program

Algorithm

DQ7#

Toggle

0

N/A

No

toggle

0

Standard

Mode

Embedded Erase Algorithm

0

Toggle

0

1

Toggle

0

Reading within Erase

Suspended Sector

1

No

Toggle

0

N/A

Toggle

1

Reading within Non-Erase

Suspended Sector

Data

Data

Data

Data

Data

1

Erase

Suspend

Mode

Erase-Suspend Program

DQ7#

Toggle

0

N/A

N/A

0