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9

EN29F002 / EN29F002N

Rev. C, Issue Date: 2001/07/05

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

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.

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

Inc. for an additional supplement on this feature.