at25df161 ATMEL Corporation, at25df161 Datasheet - Page 20

• Manufacturer Part Number: at25df161
• Description: 16-megabit 2.7-volt Minimum Spi Serial Flash Memory
• Manufacturer: ATMEL Corporation

Figure 8-7.
Program/Erase Suspend
CS
0
1
2
3
4
5
6
7
SCK
OPCODE
SI
1
0
1
1
0
0
0
0
MSB
HIGH-IMPEDANCE
SO
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
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 t
. The PS bit or the ES
RES
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
Register will indicate that the device is busy performing a program or erase operation. The com-
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
t
time before issuing the Program/Erase Suspend command, or it must check the status of
RES
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.
AT25DF161 [Preliminary]
20
3687B–DFLASH–11/08