EN29GL064AT datasheet(19/58 Pages) EON | 64 Megabit (8192K x 8-bit / 4096K x 16-bit) Flash Memory Page mode Flash Memory, CMOS 3.0 Volt-only

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This Data Sheet may be revised by subsequent versions

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or modifications due to changes in technical specifications.

EN29GL064AT/B

Rev. B, Issue Date: 2011/04/12

Chip Erase Command Sequence

Chip erase is a six-bus cycle operation as indicated by Table 13. These commands invoke the

Embedded Erase algorithm, which does not require the system to preprogram prior to erase. The

Embedded Erase algorithm automatically preprograms and verifies the entire memory to an all zero

data pattern prior to electrical erase. After a successful chip erase, all locations of the chip contain

FFFFh. The system is not required to provide any controls or timings during these operations.

When the Embedded Erase algorithm is complete, that sector returns to the read mode and addresses

are no longer latched. The system can determine the status of the erase operation by using DQ7 or

DQ6/DQ2. Refer to “Write Operation Status” for information on these status bits.

Any commands written during the chip erase operation are ignored. However, note that a hardware

reset immediately terminates the erase operation. If that occurs, the chip erase command sequence

should be reinitiated once that sector has returned to reading array data, to ensure the entire array is

properly erased.

Erase Suspend/Erase Resume Commands

The Erase Suspend command allows the system to interrupt a sector erase operation and then read

data from, or program data to, any sector not selected for erasure. The sector address is required when

writing this command. This command is valid only during the sector erase operation. The Sector Erase

Suspend command is ignored if written during the chip erase operation or Embedded Program

algorithm. Addresses are don’t-cares when writing the Sector Erase Suspend command.

When the Erase Suspend command is written during the sector erase operation, the device requires a

maximum of 20 µs to suspend the erase operation.

After the erase operation has been suspended, the device enters the erase-suspend-read mode. The

system can read data from or program data to any sector not selected for erasure. (The device “erase

suspends” all sectors selected for erasure.) Reading at any address within erase-suspended sectors

produces status information on DQ7-DQ0. The system can use DQ7, or DQ6, and DQ2 together, to

determine if a sector is actively erasing or is erase-suspended.

After an erase-suspended program operation is complete, the device returns to the erase-suspend-

read

mode. The system can determine the status of the program operation using write operation status bits,

just as in the standard program operation.

In the erase-suspend-read mode, the system can also issue the Autoselect command sequence. Refer

to Write Buffer Programming and the Autoselect for details.

To resume the sector erase operation, the system must write the Erase Resume command. The

address of the erase-suspended sector is required when writing this command. Further writes of the

Resume command are ignored. Another Erase Suspend command can be written after the chip has

resumed erasing.

Program Suspend/Program Resume Commands

The Program Suspend command allows the system to interrupt an embedded programming operation

or a “Write to Buffer” programming operation so that data can read from any non-suspended sector.

When the Program Suspend command is written during a programming process, the device halts the

programming operation within 15 µs maximum (5 µs typical) and updates the status bits. Addresses are

“don't-cares” when writing the Program Suspend command.

After the programming operation has been suspended, the system can read array data from any

nonsuspended sector. The Program Suspend command may also be issued during a programming

operation while an erase is suspended. In this case, data may be read from any addresses not within a

sector in Erase Suspend or Program Suspend. If a read is needed from the Secured Silicon Sector

area, then user must use the proper command sequences to enter and exit this region.

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