256Mb, 3V Multiple I/O Serial Flash Memory
Active, Standby, and Deep Power-Down Modes
Active, Standby, and Deep Power-Down Modes
When S# is LOW, the device is selected and in active power mode. When S# is HIGH, the
device is deselected but could remain in active power mode until ongoing internal op-
erations are completed. Then the device goes into standby power mode and device cur-
rent consumption drops to ICC1.
Deep power-down mode enbles users to place the device in the lowest power consump-
tion mode, ICC2. The ENTER DEEP POWER-DOWN command is used to put the device
in deep power-down mode, and the RELEASE FROM DEEP POWER-DOWN command
is used to bring the device out of deep power-down mode. Command details are in the
Command Set table and the DEEP POWER-DOWN Operations section of this data
sheet.
Power Loss and Interface Rescue
If a power loss occurs during a WRITE NONVOLATILE CONFIGURATION REGISTER
command, after the next power-on, the device might begin in an undetermined state
(XIP mode or an unnecessary protocol). If this occurs, a power loss recovery sequence
must reset the device to a fixed state (extended-SPI protocol without XIP) until the next
power-up.
If the controller and memory device get out of synchronization, the controller can fol-
low an interface rescue sequence to reset the memory device interface to power-up to
the last reset state (as defined by latest nonvolatile configuration register). This resets
only the interface, not the entire memory device, and any ongoing operations are not
interrupted.
After each sequence, the issue should be resolved definitively by running the WRITE
NONVOLATILE CONFIGURATION REGISTER command again.
Note: The two steps in each sequence must be in the correct order, and tSHSL2 must be
at least 50ns for the duration of each sequence.
The first step for both the power loss recovery and interface rescue sequences is descri-
bed under "Recovery." The second step in the power loss recovery sequence is under
"Power Loss Recovery" and the second step in the interface rescue sequence is under
"Interface Rescue."
Recovery
Step one of both the power loss recovery and interface rescue sequences is DQ0 (PAD
DATA) and DQ3 (PAD HOLD) equal to 1 for the situations listed here:
• 7 clock cycles within S# LOW (S# becomes HIGH before 8th clock cycle)
• + 9 clock cycles within S# LOW (S# becomes HIGH before 10th clock cycle)
• + 13 clock cycles within S# LOW (S# becomes HIGH before 14th clock cycle)
• + 17 clock cycles within S# LOW (S# becomes HIGH before 18th clock cycle)
• + 25 clock cycles within S# LOW (S# becomes HIGH before 26th clock cycle)
• + 33 clock cycles within S# LOW (S# becomes HIGH before 34th clock cycle)
CCMTD-1725822587-3368
mt25q-qljs-L256-ABA-xxT.pdf - Rev. K 07/18 EN
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