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DATA polling

(DQ7)

Only active during automated on-chip algorithms or sector erase time outs. DQ7 reflects complement

of data last written when read during the automated on-chip algorithm (0 during erase algorithm);

reflects true data when read after completion of an automated on-chip algorithm (1 after completion of

erase agorithm).

Toggle bit 1 (DQ6)

Active during automated on-chip algorithms or sector time outs. DQ6 toggles when CE or OE toggles,

or an Erase Resume command is invoked. When the automated on-chip algorithm is complete, DQ6

stops toggling and valid data can be read. DQ6 is valid after the rising edge of the fourth pulse of WE

during programming; after the rising edge of the sixth WE pulse during chip erase; after the last rising

edge of the sector erase WE pulse for sector erase. For protected sectors, DQ6 toggles for <1 µs during

writes, and <5 µs during erase (if all selected sectors are protected).

Exceeding time

limit (DQ5)

Indicates unsuccessful completion of program/erase operation (DQ5 = 1). DATA polling remains

active; CE powers the device down to 2 mA. If DQ5 = 1 during chip erase, all or some sectors are

defective; during sector erase, the sector is defective (in this case, reset the device and execute

a program or erase command sequence to continue working with functional sectors); during byte

programming, that particular byte is defective. Attempting to program 0 to 1 will set DQ5 = 1.

Sector erase timer

(DQ3)

Checks whether sector erase timer window is open. If DQ3 = 1, erase is in progress; no commands will

be accepted. If DQ3 = 0, the device will accept additional sector erase commands. Check DQ3 before

and after each Sector Erase command to verify that the command was accepted.

Toggle bit 2 (DQ2)

During sector erase, DQ2 toggles with OE or CE only during an attempt to read a sector being erased.

During chip erase, DQ2 toggles with OE or CE for all addresses. If DQ5 = 1, DQ2 toggles only at sector

addresses where failure occurred, and will not toggle at other sector addresses. Use DQ2 in conjunction

with DQ6 to determine whether device is in auto erase or erase suspend mode.

Status

DQ7

DQ6

DQ5

DQ3

DQ2

In progress

Auto programming (byte)

DQ7

Toggle

0

0

No toggle

Program/erase in auto erase

0

Toggle

0

1

*

Toggles with

Erase

suspend

mode

Read erasing sector

1

No toggle

0

0

Toggle

Read non-erasing

sector

Data

Data

Data

Data

Data

Program in erase

suspend

DQ7

Toggle

0

0

Toggle

*

Exceeded time limits

Auto programming (byte)

DQ7

Toggle

1

0

No toggle

Program/erase in auto erase

0

Toggle

1

1

Toggle

†

†

Toggles with

Program in erase suspend

DQ7

Toggle

1

0