EN29F002N Datasheet, PDF (9/32 Pages) List of Unclassifed Manufacturers – 2 Megabit (256K x 8-bit) Flash Memory

EN29F002 / EN29F002N
the erase. Then the EN29F002 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 EN29F002 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 EN29F002 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.
EN29F002 ignores any commands during erase suspend other than the assertion of the RESET
pin (n/a for EN29F002N) or Erase Resume commands. Writing erase resume continues erase
operations. Addresses are DON’T CARE when writing Erase Suspend or Erase Resume
commands.
EN29F002 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. EN29F002 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, EN29F002 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. En29F002 ignores
redundant writes of the Resume command. En29F002 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 Devices,
Inc. for an additional supplement on this feature.
4800 Great America Parkway, Suite 202
9
Santa Clara, CA 95054
Rev. C, Issue Date: 2001/07/05
Tel: [phone]
Fax: [phone]