FM25D04C-1ACB2R View Datasheet(PDF) - FIDELIX

Part Name

Description

Manufacturer

FM25D04C-1ACB2R

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

FIDELIX 

FM25Q32

11.2.29 Read Security Register (2Bh)

The Read Security Register instruction is for reading the value of Security Register bits. The Read

Security Register can be read at any time (even in program/erase/write status register condition)

and continuously.

The definition of the Security Register bits is as below:

Secured OTP Indicator bit. The Secured OTP indicator bit shows the chip is locked by factory

before ex-factory or not. When it is “0”, it indicates non-factory lock, “1” indicates factory-lock.

Lock-down Secured OTP (LDSO) bit. By writing WRSCUR instruction, the LDSO bit may be set

to “1” for customer lock-down purpose. However, once the bit it set to “1” (Lock-down), the LDSO

bit and the 4K-bit Secured OTP area cannot be updated any more. While it is in 4K-bit Secured

OTP mode, array access is not allowed to write.

/CS

CLK

Mode 3

Mode 0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Instruction (2Bh)

DI

Security Register out

Security Register out

DO

=MSB

7 65 4 321 0765 4 321 0 7

Figure 29. Read Security Register instruction sequence

Security Register Definition

Bit7

Bit6

Bit5

x

x

x

reserved reserved reserved

Volatile Volatile Volatile

bit

bit

bit

Bit4

x

reserved

Volatile

bit

Bit3

x

reserved

Volatile

bit

Bit2

x

reserved

Volatile

bit

Bit1

LDSO

(indicate if

lock-

down)

0 = not

lock-down

1 = lock-

down(can

not

program/e

rase OTP)

Non-

Volatile bit

Bit0

Secured

OTP

indicator

bit

0 = non

factory

lock

1 = factory

lock

Non-

Volatile bit

preliminary(Aug.18.2010) 46

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