ST25TV02K datasheet(13/90 Pages) STMICROELECTRONICS

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Table 12. PWD_A1

Command

Write pswd (cmd code B1h) with pswd_id = 1h

Type

WO: if RF area 1 security session is open (area 1 password has been presented before).

Bit

Name

Function

Factory value

b31-b0

A1_PSWD

When MEM_ORG=0: Password value for user area 1

When MEM_ORG=1: 32 least significant bits of the 64-bit Password

value for user area 1

00000000h

Note:

Refer to Table 5. System configuration memory map for registers accessed through dedicated commands

Table 13. PWD_A2

Command

Write pswd (cmd code B1h) with pswd_id = 2h

Type

WO: if RF area 2 security session is open (area 2 password has been presented before). Only

applicable to the case of MEMORG=0

Bit

Name

Function

Factory value

b31-b0

A2_PSWD

When MEM_ORG=0: Password value for user area 2 in case of three

area memory setup

When MEM_ORG=1: 32 most significant bits of area 1 password in

case of two area memory setup

(in this last case area 1 password is 64-bit long)

00000000h

Note:

Refer to Table 5. System configuration memory map for registers accessed through dedicated commands .

5.2.2

Passwords and security sessions

ST25TV02K/512 provide protection of user memory and system configuration registers. The users can access

those protected data by opening security sessions with the help of passwords. Access rights are more restricted

when security sessions are closed, and less restricted when security sessions are open.

There are two types of security sessions, as shown in Table 14:

Table 14. Security session type

Security session

Open by presenting

Right granted when security session is open, and until it is

closed

user

password Area 1, Area 2

(PWD_A1, PWD_A2)

user access to protect user memory as defined in AiSS registers

user write access to password A1 or A2(1)

configuration

Configuration password

(PWD_CFG)

user write access to configuration registers

1. Write access to the password number corresponding to the password number presented.

In a three areas set up (MEM_ORG set at 0), each of the User Area 1 and 2 passwords is 32-bits long, and

default factory passwords value is 00000000h.

In a two areas setup (MEM_ORG set at 1), User Area 1 password is 64-bits long, and default factory password

value is 0000000000000000h.

The ST25TV02K/512 passwords management is organized around dedicated set of commands to access the

dedicated registers in system configuration area.

The dedicated password commands are:

•

Write Password command (code B1h): See Section 6.4.20 Write Password.

•

Present Password command (code B3h): See Section 6.4.21 Present Password

User possible actions for security sessions are:

ST25TV02K ST25TV512

Data protection

DS12074 - Rev 11

page 13/90

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