EN29F040 Datasheet, PDF (13/32 Pages) List of Unclassifed Manufacturers – 4 Megabit (512K x 8-bit) Flash Memory

EN29F040
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).
Table 6. Status Register Bits
DQ
Name
Logic Level
Definition
‘1’
Erase Complete or
erase Sector in Erase suspend
‘0’
Erase On-Going
DATA
7
POLLING
DQ7
Program Complete or
data of non-erase Sector during Erase
Suspend
DQ7
‘-1-0-1-0-1-0-1-’
6
TOGGLE
BIT
DQ6
‘-1-1-1-1-1-1-1-‘
Program On-Going
Erase or Program On-going
Read during Erase Suspend
Erase Complete
5
ERROR BIT
‘1’
‘0’
Program or Erase Error
Program or Erase On-going
Chip Erase, Erase or Erase suspend on
currently addressed
‘-1-0-1-0-1-0-1-’
Sector. (When DQ5=1, Erase Error due to
2
TOGGLE
BIT
currently addressed Sector. Program during
Erase Suspend on-going at current address
DQ2
Erase Suspend read on
non Erase Suspend Sector
Notes:
DQ7 DATA Polling: indicates the P/E C status check during Program or Erase, and on completion before checking bits
DQ5 for Program or Erase Success.
DQ6 Toggle Bit: remains at constant level when P/E operations are complete or erase suspend is acknowledged.
Successive reads output complementary data on DQ6 while programming or Erase operation are on-going.
DQ5 Error Bit: set to “1” if failure in programming or erase
DQ2 Toggle Bit: indicates the Erase status and allows identification of the erased Sector.
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Rev. D, Issue Date: 2001/07/05
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