N25Q256A13EF840F Datasheet, PDF (66/90 Pages) Micron Technology – Micron Serial NOR Flash Memory

3V, 256Mb: Multiple I/O Serial Flash Memory
ONE TIME PROGRAMMABLE Operations
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.
The write enable latch bit is cleared to 0, whether the operation is successful or not, and
the status register and flag status register can be polled for the operation status. When
the operation completes, the write in progress bit is cleared to 0.
If the operation times out, the write enable latch bit is reset and the program fail bit is
set to 1. If S# is not driven HIGH, the command is not executed, flag status register error
bits are not set, and the write enable latch remains set to 1.
The OTP control byte (byte 64) is used to permanently lock the OTP memory array.
Table 30: OTP Control Byte (Byte 64)
Bit Name
0 OTP control byte
Settings
0 = Locked
1 = Unlocked
(Default)
Description
Used to permanently lock the 64B OTP array. When bit 0 = 1, the 64B OTP
array can be programmed. When bit 0 = 0, the 64B OTP array is read only.
Once bit 0 has been programmed to 0, it can no longer be changed to 1.
PROGRAM OTP ARRAY is ignored, write enable latch bit remains set, and
flag status register bits 1 and 4 are set.
PDF: 09005aef84566603
n25q_256mb_65nm.pdf - Rev. O 12/12 EN
66
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