FM25D04B-85IAWR View Datasheet(PDF) - FIDELIX

Part Name

Description

Manufacturer

FM25D04B-85IAWR

32M-BIT Serial Flash Memory with 4KB Sectors, Dual and QuadI/O SPI

FIDELIX 

FM25Q32

11.2.27 Enter Secured OTP (B1h)

The Enter Secured OTP instruction is for entering the additional 4K-bit secured OTP mode. The

additional 4K-bit secured OTP is independent from main array, which may be used to store unique

serial number for system identifier. After entering the Secured OTP mode, and then follow standard

read or program, procedure to read out the data or update data. The Secured OTP data cannot be

updated again once it is lock-down

Please note that WRSR/WRSCUR commands are not acceptable during the access of secure

OTP region, once security OTP is lock down, only commands related with read are valid.

The Enter Secured OTP instruction sequence is shown in figure 27.

/ CS

Mode 3

CLK

Mode 0

DI

0

1

23

4

5

6 7 Mode3

Mode 0

Instruction(B1h)

Figure 27. Enter Secured OTP instruction sequence

11.2.28 Exit Secured OTP (C1h)

The Exit Secured OTP instruction is for exiting the additional 4K-bit secured OTP mode.

The Exit Secured OTP instruction sequence is shown in figure 28

/CS

Mode 3

CLK

Mode 0

DI

0

1

23

4

5

6

7 Mode 3

Mode 0

Instruction (C1h)

Figure 28. Exit Secured OTP instruction sequence

preliminary(Aug.18.2010) 45

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