512Mb, Multiple I/O Serial Flash Memory
WRITE Operations
WRITE Operations
WRITE ENABLE Command
The WRITE ENABLE operation sets the write enable latch bit. To execute a WRITE ENA-
BLE command, S# is driven LOW and held LOW until the eighth bit of the command
code has been latched in, after which it must be driven HIGH. The command code is
input on DQ0 for extended SPI protocol, on DQ[1:0] for dual SPI protocol, and on
DQ[3:0] for quad SPI protocol.
The write enable latch bit must be set before every PROGRAM, ERASE, WRITE, ENTER
4-BYTE ADDRESS MODE, and EXIT 4-BYTE ADDRESS MODE command. If S# is not
driven HIGH after the command code has been latched in, the command is not execu-
ted, flag status register error bits are not set, and the write enable latch remains cleared
to its default setting of 0.
WRITE DISABLE Command
The WRITE DISABLE operation clears the write enable latch bit. To execute a WRITE
DISABLE command, S# is driven LOW and held LOW until the eighth bit of the com-
mand code has been latched in, after which it must be driven HIGH. The command
code is input on DQ0 for extended SPI protocol, on DQ[1:0] for dual SPI protocol, and
on DQ[3:0] for quad SPI protocol.
If S# is not driven HIGH after the command code has been latched in, the command is
not executed, flag status register error bits are not set, and the write enable latch re-
mains set to 1.
Note: In case of a protection error, write disable will not clear the write enable latch. In
this situation, a CLEAR FLAG STATUS REGISTER command must be issued to clear
both flags.
PDF: 09005aef84752721
n25q_512mb_1ce_3V_65nm.pdf - Rev. O 05/13 EN
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