AT25DF321A-MH-Y datasheet(20/58 Pages) ATMEL

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3686C–DFLASH–12/08

AT25DF321A [Preliminary]

Figure 8-7.

Program/Erase Suspend

8.6

Program/Erase Resume

The Program/Erase Resume command allows a suspended program or erase operation to be

resumed and continue programming a Flash page or erasing a Flash memory block where it left

off. As with the Program/Erase Suspend command, the Write Enable command does not need

to be issued prior to the Program/Erase Resume command being issued. Therefore, the Pro-

gram/Erase Resume command operates independently of the state of the WEL bit in the Status

To perform a Program/Erase Resume, the CS pin must first be asserted and the opcode of D0h

must be clocked into the device. No address bytes need to be clocked into the device, and any

data clocked in after the opcode will be ignored. When the CS pin is deasserted, the program or

erase operation currently suspended will be resumed within a time of t

RES. The PS bit or the ES

bit in the Status Register will then be reset back to the logical “0” state to indicate that the pro-

gram or erase operation is no longer suspended. In addition, the RDY/BSY bit in the Status

plete 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 resume

operation will be performed.

During a simultaneous Erase Suspend/Program Suspend condition, issuing the Program/Erase

Resume command will result in the program operation resuming first. After the program opera-

tion has been completed, the Program/Erase Resume command must be issued again in order

for the erase operation to be resumed.

While the device is busy resuming a program or erase operation, any attempts at issuing the

Program/Erase Suspend command will be ignored. Therefore, if a resumed program or erase

operation needs to be subsequently suspended again, the system must either wait the entire

RES time before issuing the Program/Erase Suspend command, or it must check the status of

the RDY/BSY bit or the appropriate PS or ES bit in the Status Register to determine if the previ-

ously suspended program or erase operation has resumed.

SCK

MSB

10110000

OPCODE

HIGH-IMPEDANCE

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