ST25TV02K datasheet(11/90 Pages) STMICROELECTRONICS

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5.1.2

Kill mode description

KILL register allows the user to permanently kill the ST25TV02K/512 tag.

Two working modes are offered by ST25TV02K/512:

•

Kill mute mode:

–

When KILL_MUTE is set with the Kill command code, the ST25TV02K/512 are killed. They can not be

read or written and stays mute to any request. Kill mute mode is definitive.

•

Normal mode:

–

In normal usage, KILL_MUTE is set to 0, ST25TV02K/512 will process the request and respond

accordingly.

The Kill Password PWD_KILL must be presented in the Kill command for setting the Kill Mute mode.

Kill Password lock

By default, the Kill password is not write protected. The kill password can be locked with Lock kill (cmd code B2h).

For safe operation, it is recommended to change the default value of the Kill Password and lock it even if not used

in the final product

When not used in an end application, a random value should be written into the KILL_PWD and the KILL_PWD

should be locked with Lock kill.

5.2

Data protection

ST25TV02K/512 provide a special data protection mechanism based on encrypted passwords that unlock

security sessions.

User memory can be protected for read and/or write access and system configuration can be protected from write

access. User memory can also be permanently locked. Each block can be independently locked from each other

with the Lock block command (refer to Section 6.4.8 Lock block).

5.2.1

Data protection registers

Table 8. A1SS

Command

Read Configuration (cmd code A0h) @00h

Write Configuration (cmd code A1h) @00h

Type

R always, W if configuration security session is open and configuration not locked

Bit

Name

Function

Factory value

b1-b0

RW_PROTECTION_A1

Area 1 access rights:

00: Area 1 access: Read is always allowed / Write always allowed

01: Area 1 access: Read is always allowed and if user security

session is open (i.e. the proper area 1 password has been presented),

write is allowed.

10: Area 1 access: Read and Write are allowed only if user security

session is open (the proper area 1 password has been presented).

11: Area 1 access: Read is allowed only if user security session is

open (the proper area 1 password has been presented). Write is

always forbidden.

00b

MEM_ORG

0: memory is split in three areas (Areas 0, 1 and 2)

1: memory is composed of two areas (Areas 0 and 1)

b7-b3

RFU

00000b

Note:

Refer to Table 4. System configuration memory map accessible through write_cfg and read_cfg commands

ST25TV02K ST25TV512

Data protection

DS12074 - Rev 11

page 11/90

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