AT25QL641 datasheet(65/77 Pages) DIALOG

부품명	AT25QL641

상세설명	64-Mbit, 1.7V Minimum SPI Serial Flash Memory with Dual I/O, Quad I/O and QPI Support

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AT25QL641

DS-25QL641–130E–10/2018

Figure 7-63. Write Security Register Instruction for SPI Mode (left) and QPI Mode (right)

7.41

4 Kbit Secured OTP

The AT25QL641 provides a 4 Kbit one-time-program area for setting a unique serial number which can be set by

either the factory or the customer. Security register bit 0 indicates whether the chip is locked by factory or not.

The 4 Kbit OTP space is accessed using the B1h instruction as described above. After the OTP value has been

programmed, the C1h instruction is used to exit from the secured OTP space.

The secure OTP space is divided into a 128-bit electronic serial number, and 3968 bits is user-defined data as shown in

Table 7-13.

Note. Once the OTP space is locked down, either by the factory or the customer, it cannot be changed any more.

While in 4 Kbit secured OTP mode, array access is not allowed to write.

Table 7-13. Secure OTP Address Space

Address Range

Size

Standard

Customer Lock

000000 ~ 00000F

128-bit

ESN

(Electrical Serial Number)

Determined by customer

000010 ~ 0001FF

3968-bit

N/A

AT25QL641 데이터시트(PDF) 65 Page - Dialog Semiconductor