AT25DF641A datasheet(17/57 Pages) ATMEL

17 / 57 page

8693A–DFLASH–8/10

Atmel AT25DF641A [Preliminary]

erase operation currently in progress will be suspended within a time of t

SUSP. The Program Sus-

pend (PS) bit or the Erase Suspend (ES) bit in the Status Register will then be set to the logical

“1” state to indicate that the program or erase operation has been suspended. In addition, the

RDY/BSY bit in the Status Register will indicate that the device is ready for another operation.

The complete opcode must be clocked into the device before the CS pin is deasserted, and the

CS pin must be deasserted on an even byte boundary (multiples of eight bits); otherwise, no

suspend operation will be performed.

Read operations are not allowed to a 64-Kbyte sector that has had its program or erase opera-

tion suspended. If a read is attempted to a suspended sector, then the device will output

undefined data. Therefore, when performing a Read Array operation to an unsuspended sector

and the device’s internal address counter increments and crosses the sector boundary to a sus-

pended sector, the device will then start outputting undefined data continuously until the address

counter increments and crosses a sector boundary to an unsuspended sector.

A program operation is not allowed to a sector that has been erase suspended. If a program

operation is attempted to an erase suspended sector, then the program operation will abort and

the WEL bit in the Status Register will be reset back to the logical “0” state. Likewise, an erase

operation is not allowed to a sector that has been program suspended. If attempted, the erase

operation will abort and the WEL bit in the Status Register will be reset to a logical “0” state.

During an Erase Suspend, a program operation to a different 64-Kbyte sector can be started and

subsequently suspended. This results in a simultaneous Erase Suspend/Program Suspend con-

dition and will be indicated by the states of both the ES and PS bits in the Status Register being

set to the logical “1” state.

If a Reset operation (see “Reset” on page 40) is performed while a sector is erase suspended,

the suspend operation will abort and the contents of the block in the suspended sector will be left

in an undefined state. However, if a Reset is performed while a sector is program suspended,

the suspend operation will abort but only the contents of the page that was being programmed

and subsequently suspended will be undefined. The remaining pages in the 64-Kbyte sector will

retain their previous contents.

If an attempt is made to perform an operation that is not allowed during a program or erase sus-

pend, such as a Protect Sector operation, then the device will simply ignore the opcode and no

operation will be performed. The state of the WEL bit in the Status Register, as well as the SPRL

(Sector Protection Registers Locked) and SLE (Sector Lockdown Enabled) bits, will not be

affected.

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