EN29F002A / EN29F002AN
to do anything else after that, except check to see if the operation has completed. The Auto Chip
Erase algorithm automatically programs and verifies the entire memory array for an all “0” pattern
prior to the erase. Then the EN29F002A will automatically time the erase pulse width, verify the
erase, return the sequence count, provide a erase status through
DATA
POLLING (data on DQ7 is
“0” during the operation and “1” when completed, provided the status is not read from a protected
sector), and returns to the READ mode after completion of Chip Erase.
Sector Erase Command
Sector Erase requires six bus cycles: two unlock write cycles, a setup command, two additional
unlock write cycles, and the Sector Erase command. Any sector may be erased by latching any
address within the desired sector on the falling edge of
W E
while the Erase Command (30H) is
latched on the rising edge of
W E
. This device does not support multiple sector erase commands.
Sector Erase operation will commence immediately after the first 30h command is written. The first
sector erase operation must finish before another sector erase command can be given.
The EN29F002A device automatically programs and verifies all memory locations in the selected
sector for an all “0” pattern prior to the erase. Unselected sectors are unaffected by the Sector
Erase command. The EN29F002A requires no timing signals during sector erase. Erase is
completed when data on DQ7 becomes “1”, and the device returns to the READ mode after
completion of Sector Erase.
Erase Suspend / Resume Command
Erase suspend allows interruption of sector erase operations to perform data reads from sector not
being erased. Erase suspend applies only to Sector Erase operations.
EN29F002A ignores any commands during erase suspend other than the assertion of the
RESET
pin (n/a for EN29F002AN) or Erase Resume commands. Writing erase resume continues erase
operations. Addresses are DON’T CARE when writing Erase Suspend or Erase Resume
commands.
EN29F002A takes 0.1 - 15
µs
to suspend erase operations after receiving Erase Suspend command.
Check completion of erase suspend by polling DQ7 and/or DQ6. EN29F002A ignores redundant
writes of erase suspend command.
EN29F0002 defaults to erase-suspend-read mode while an erase operation has been suspended.
While in erase-suspend-read mode, EN29F002A allows reading data in any sector not undergoing
sector erase, which is treated as standard read mode.
Write the Resume command 30h to continue operation of Sector erase. EN29F002A ignores
redundant writes of the Resume command. EN29F002A permits multiple suspend/resume
operations during sector erase.
Sector Protect and Unprotect
The hardware sector protection feature disables both program and erase operations in any sector.
The hardware sector unprotection feature re-enables both program and erase operation in
previously protected sectors.
Sector protection/unprotection must be implemented using programming equipment. The procedure
requires a high voltage (V
ID
) on address pin A9 and the control pins. Contact Eon Silicon Solution,
Inc. for an additional supplement on this feature.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
9
©2003 Eon Silicon Solution, Inc., www.essi.com.tw
Rev. A, Issue Date: 2003/03/26
EON [ EON SILICON SOLUTION INC. ]
