256Mb, 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 address bytes and dummy clock cycles. Each address bit is
latched in during the rising edge of C. Data is shifted out on DQ1, beginning from the
specified address and at a maximum frequency of fC (MAX) on the falling edge of the
clock. The address increments automatically to the next address after each byte of data
is shifted out. There is no rollover mechanism; therefore, if read continuously, after lo-
cation 0x40, the device continues to output data at location 0x40. The operation is ter-
minated by driving S# HIGH at any time during data output.
Figure 43: READ OTP ARRAY Command Timing
Extended
0
7
8
Cx
C
LSB
A[MIN]
DQ0
DQ1
Command
MSB
A[MAX]
LSB
DOUT DOUT
DOUT
MSB
DOUT
DOUT
DOUT
DOUT
DOUT
DOUT
High-Z
Dummy cycles
Dual
0
3
4
Cx
C
LSB
A[MIN]
LSB
DOUT DOUT
DOUT
MSB
DOUT
DOUT
DQ[1:0]
Command
MSB
A[MAX]
Dummy cycles
Quad
0
1
2
Cx
C
LSB
A[MIN]
LSB
DOUT
DOUT
MSB
DOUT
DQ[3:0]
Command
MSB
A[MAX]
Don’t Care
Dummy cycles
1. For extended-SPI protocol, Cx = 7 + (A[MAX] + 1); For dual-SPI protocol, Cx = 3 + (A[MAX]
+ 1)/2; For quad-SPI protocol, Cx = 1 + (A[MAX] + 1)/4.
Note:
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 address 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
tPOTP. There is no rollover mechanism; therefore, after a maximum of 65 bytes are
latched in the subsequent bytes are discarded.
PROGRAM OTP ARRAY programs, at most, 64 bytes to the OTP memory area and one
OTP control byte. When the operation is in progress, the write in progress bit is set to 1.
CCMTD-1725822587-3368
mt25q-qljs-L256-ABA-xxT.pdf - Rev. K 07/18 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
70
© 2014 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
