32Mb, 3V, Multiple I/O Serial Flash Memory
ONE TIME PROGRAMMABLE Operations
ONE TIME PROGRAMMABLE Operations
READ OTP ARRAY Command
To initiate a READ OTP ARRAY command, S# is driven LOW. The command code is in-
put on DQ0, followed by three bytes and dummy clock cycles. Each address bit is latch-
ed in during the rising edge of C. Data is shifted out on DQ1, beginning from the speci-
fied address and at a maximum frequency of
f
C (MAX) on the falling edge of the clock.
The address increments automatically to the next address after each byte of data is shif-
ted out. There is no rollover mechanism; therefore, if read continuously, after location
40h, the device continues to output data at location 40h. The operation is terminated by
driving S# HIGH at any time during data output.
Figure 28: READ OTP Command
Extended
C
LSB
DQ0
MSB
Command
A[MAX]
D
OUT
MSB
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
LSB
D
OUT
D
OUT
A[MIN]
0
7
8
C
x
DQ1
High-Z
Dual
C
Dummy cycles
0
3
4
C
x
LSB
DQ[1:0]
MSB
Command
A[MAX]
A[MIN]
D
OUT
MSB
Dummy cycles
D
OUT
D
OUT
LSB
D
OUT
D
OUT
Quad
C
0
1
2
C
x
LSB
DQ[3:0]
MSB
Command
A[MAX]
A[MIN]
D
OUT
MSB
Dummy cycles
LSB
D
OUT
D
OUT
Don’t Care
Note:
1. For extended SPI protocol, C
x
= 7 + (A[MAX] + 1).
For dual SPI protocol, C
x
= 3 + (A[MAX] + 1)/2.
For quad SPI protocol, C
x
= 1 + (A[MAX] + 1)/4.
PROGRAM OTP ARRAY Command
To initiate the PROGRAM OTP ARRAY command, the WRITE ENABLE command must
be issued to set the write enable latch bit to 1; otherwise, the PROGRAM OTP ARRAY
command is ignored and flag status register bits are not set. 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. The command code is input on DQ0, followed by three bytes and at least
one data byte. Each address bit is latched in during the rising edge of the clock. When S#
is driven HIGH, the operation, which is self-timed, is initiated; its duration is
t
POTP
.
There is no rollover mechanism; therefore, after a maximum of 65 bytes are latched in
and subsequent bytes are discarded.
PDF: 09005aef84566622
n25q_32mb_3v_65nm.pdf - Rev. G 9/12 EN
55
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