AT25DF641_13 datasheet(20/56 Pages) ETC2

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AT25DF641

3680F–DFLASH–4/10

Figure 7-7.

Program/Erase Suspend

SCK

MS B

OP C ODE

HIG H-IMP E DANC E

7.6.

Program/Erase Resume

The Program/Erase Resume command allows a s uspended program or erase operation to be r esumed 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 Program/Erase Resume command operates independently of the state of

the WEL bit in the Status Register.

To perform a Program/Erase Resume, the

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

pin is deasserted, the program or erase operation currently suspended will be

resumed within a time of tRES. 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 program or erase operation is no longer suspended. In addition, the RDY/BSY bit in

the Status Register will indicate that the device is busy performing a program or erase operation. The complete

opcode must be clocked into the device before the

pin is deasserted, and the

pin must be deasserted on

an even byte boundary (multiples of eight bits); otherwise, no resume operation will be performed.

During a s imultaneous Erase Suspend/Program Suspend condition, issuing the Program/Erase Resume

command will result in the program operation resuming first. After the program operation 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 pr ogram 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 tRES 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 previously suspended program or erase operation has resumed.

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