ST25DV64K datasheet(60/200 Pages) STMICROELECTRONICS

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•

RF write access to system configuration static registers can be locked by writing 01h in the LOCK_CFG

•

RF user cannot unlock system configuration if LOCK_CFG=01h, even after opening RF configuration

security session (only I2C host can unlock system configuration).

•

When system configuration is locked (LOCK_CFG=01h), it is still possible to change RF passwords (0 to 3).

Device identification registers:

•

AFI and DFSID registers can be independently locked by RF user, issuing respectively a Lock AFI and a

Lock DSFID command. Lock is definitive: once locked, AFI and DSFID registers cannot be unlocked (either

by RF or I2C). System configuration locking mechanism (LOCK_CFG=01h) does not lock AFI and DSFID

registers.

•

Other device identification registers (MEM_SIZE, BLK_SIZE, IC_REF, UID, IC_REV) are read only registers

for both RF and I2C.

5.7

Device Parameter Registers

Table 70. LOCK_DSFID access

I2C

Command

Type

Address

Type

Lock DSFID (cmd code 2Ah)

WO if DSFID not locked

E2 = 1, 0010h

Table 71. LOCK_DSFID

Bit

Name

Function

Factory Value

LOCK_DSFID

0: DSFID is not locked

1: DSFID is locked

b7-b1

RFU

0000000b

Note:

Refer to Table 11. System configuration memory map for the LOCK_DSFID register.

Table 72. LOCK_AFI access

I2C

Command

Type

Address

Type

Lock AFI (cmd code 28h)

WO if AFI not locked

E2 = 1, 0011h

Table 73. LOCK_AFI

Bit

Name

Function

Factory Value

LOCK_AFI

0: AFI is not locked

1: AFI is locked

b7-b1

RFU

0000000b

Note:

Refer to Table 11. System configuration memory map for the LOCK_AFI register.

ST25DV04K ST25DV16K ST25DV64K

Device Parameter Registers

DS10925 - Rev 9

page 60/200

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