EN29PL032A datasheet(29/52 Pages) EON

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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.

EN29PL032A

Rev. B, Issue Date: 2010/12/27

15.8 Erase Suspend/Erase Resume Commands

The Erase Suspend command, B0h, 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 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 Word Program operation.

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

to the Autoselect for details.

To resume the sector erase operation, the system must write the Erase Resume command (address

bits are don’t care). 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.

15.9 Program Suspend/Program Resume Commands

The Program Suspend command allows the system to interrupt an embedded 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 non-

suspended 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.

The system may also write the autoselect command sequence when the device is in Program Suspend

mode. The device allows reading autoselect codes in the suspended sectors, since the codes are not

stored in the memory array. When the device exits the autoselect mode, the device reverts to Program

Suspend mode, and is ready for another valid operation. See “Autoselect Command Sequence” for

more information.

After the Program Resume command is written, the device reverts to programming. The system can

determine the status of the program operation using the write operation status bits, just as in the

standard program operation. See “Write Operation Status” for more information. The system must write

the Program Resume command (address bits are “don’t care”) to exit the Program Suspend mode and

continue the programming operation. Further writes of the Program Resume command are ignored.

Another Program Suspend command can be written after the device has resumed programming.

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