EN29F040A EON [Eon Silicon Solution Inc.], EN29F040A Datasheet - Page 13

• Manufacturer Part Number: EN29F040A
• Description: 4 Megabit (512K x 8-bit) Flash Memory
• Manufacturer: EON [Eon Silicon Solution Inc.]

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
Notes:
DQ7
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.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
DATA
DQ
7
6
5
2
Polling: indicates the P/E status check during Program or Erase, and on completion before checking bits DQ5
ERROR BIT
POLLING
TOGGLE
TOGGLE
DATA
Name
BIT
BIT
‘-1-0-1-0-1-0-1-’
‘-1-1-1-1-1-1-1-‘
‘-1-0-1-0-1-0-1-’
Logic Level
DQ7
DQ7
DQ6
DQ2
‘1’
‘0’
‘1’
‘0’
Rev. B, Issue Date: 2004/04/01
13
data of non-erase Sector during Erase Suspend
Chip Erase, Sector Erase or Erase suspend on
(When DQ5=1, Erase Error due to currently
addressed Sector. Program during Erase
©2003 Eon Silicon Solution, Inc., www.essi.com.tw
Suspend on-going at current address
erase Sector in Erase suspend
Read during Erase Suspend
Erase or Program On-going
Program or Erase On-going
currently addressed Sector.
non Erase Suspend Sector
Program or Erase Error
Erase Suspend read on
Program Complete or
Erase Complete or
Program On-Going
Erase On-Going
Erase Complete
Definition
EN29F040A