512Mb, Multiple I/O Serial Flash Memory
READ REGISTER and WRITE REGISTER Operations
Figure 10: WRITE REGISTER Command
Extended
0
7
8
9
10
11
12
13
14
15
C
LSB
LSB
DIN
MSB
DIN
DIN
DIN
DIN
DIN
DIN
DIN
DIN
DIN
DIN
DQ0
Command
MSB
MSB
MSB
Dual
0
3
4
5
6
7
C
LSB
LSB
DIN
MSB
DIN
DIN
DIN
DQ[1:0]
Command
0
Quad
1
2
3
C
LSB
LSB
DIN
MSB
DIN
DQ[3:0]
Command
1. Supports all WRITE REGISTER commands except WRITE LOCK REGISTER.
Notes:
2. A WRITE NONVOLATILE CONFIGURATION REGISTER operation requires data being sent
starting from least significant byte. For this command, the data in consists of two bytes.
WRITE NONVOLATILE CONFIGURATION REGISTER Command
To execute the WRITE NONVOLATILE CONFIGURATION REGISTER command, the
WRITE ENABLE command must be executed to set the write enable latch bit to 1. S# is
driven LOW and held LOW until the 16th bit of the last data byte has been latched in,
after which it must be driven HIGH. For extended SPI protocol, the command code is
input on DQ0, followed by two data bytes. For dual SPI protocol, the command code is
input on DQ[1:0], followed by the data bytes. For quad SPI protocol, the command code
is input on DQ[3:0], followed by the data bytes. When S# is driven HIGH, the operation,
which is self-timed, is initiated; its duration is tWNVCR.
When the operation is in progress, the program or erase controller bit of the flag status
register is set to 0. To obtain the operation status, the flag status register must be polled
twice, with S# toggled twice in between commands. When the operation completes, the
program or erase controller bit is cleared to 1. The end of operation can be detected
when the flag status register outputs the program or erase controller bit to 1 both times.
When the maximum time achieved (see AC Characteristics and Operating Conditions),
polling the flag status register twice is not required.
WRITE VOLATILE or ENHANCED VOLATILE CONFIGURATION REGISTER Command
To execute a WRITE VOLATILE CONFIGURATION REGISTER command or a WRITE
ENHANCED VOLATILE CONFIGURATION REGISTER command, the WRITE ENABLE
command must be executed to set the write enable latch bit to 1. S# is driven LOW and
held LOW until the eighth bit of the last data byte has been latched in, after which it
must be driven HIGH. For extended SPI protocol, the command code is input on DQ0,
PDF: 09005aef84752721
n25q_512mb_1ce_3V_65nm.pdf - Rev. O 05/13 EN
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