ST25TV02K datasheet(7/90 Pages) STMICROELECTRONICS

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Memory management

4.1

Memory organization overview

The ST25TV02K/512 memory is divided in two main memory areas:

•

User memory

•

System configuration area

The ST25TV02K/512 user memory can be divided into two or three user areas. Area 0 starts at address 0, it has

1 block size, it is always readable, and it can be locked.

The rest of the user memory can be either configured as one single area (Area 1) and can be read - and/or

- write-protected with one 64-bit password, or configured as two areas (Area 1 and Area 2), which can be

individually read - and/or - write-protected with a 32-bit password each. When Area 2 exists, Area 2 starts at the

block number corresponding to half the user memory.

Furthermore, each block can be locked permanently and individually for larger flexibility in number of areas

The ST25TV02K/512 system configuration area contains registers to configure all ST25TV02K/512 features,

which can be tuned by user. Its access is protected by a 32 bit configuration password.

This system configuration area also includes read only device information such as IC reference, memory size,

as well as a 64-bit block that is used to store the 64-bit unique identifier (UID), the AFI (default 00h) and DSFID

(default 00h) registers, the TruST25™ digital signature. The UID is compliant with the ISO 15693 description, and

its value is used during the anticollision sequence (Inventory). The UID value is written by ST on the production

line. The AFI register stores the application family identifier. The DSFID register stores the data storage family

identifier used in the anticollision algorithm.

The system configuration area includes blocks that store up to two RF user area access passwords and a RF

configuration password.

Figure 5. Memory organization

Area 1

Area 0:

1 block (always readable)

Half user

memory

User memory

(EEPROM up

to 2-Kbits)

Password

protected

Area 2

Area 0:

1 block (always readable)

Area 1

Note: Each block can be individually locked

ST25TV02K ST25TV512

Memory management

DS12074 - Rev 11

page 7/90

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