Owner manual

AT25DQ321 [DATASHEET]

8718D–DFLASH–12/2012

8.7 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 Program/Erase Resume command operates independently of the state of the WEL bit in the

Status Register.

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

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

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

CS pin is deasserted and the CS pin must be deasserted on a 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 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 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 t

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 previously

suspended program or erase operation has resumed.

Figure 8-10. Program/Erase Resume

SCK

MSB

2310

11010000

6754

Opcode

High-impedance