ST25TV02K datasheet(8/90 Pages) STMICROELECTRONICS

8 / 90 page

4.2

User memory

User memory is addressed as blocks of 4 bytes, starting at address 0. Table 2. 2Kb user memory as seen by RF

shows how memory is seen from RF interface.

Table 2. 2Kb user memory as seen by RF

RF command

(block addressing)

User memory

Read Single Block

Read Multiple Blocks

Fast Read Single Block

Fast Read Multiple Blocks

Write Single Block

Inventory Read

Fast Inventory Read

RF block 00h

Byte

0003h

Byte

0002h

Byte

0001h

Byte

0000h

RF block 01h

Byte

0007h

Byte

0006h

Byte

0005h

Byte

0004h

RF block 02h

Byte

0011h

Byte

0010h

Byte

0009h

Byte

0008h

....

RF block 3Fh

Byte

03FFh

Byte

03FEh

Byte

03FDh

Byte

03FCh

4.2.1

User memory areas

The user memory can be split into two or three different areas as showed in Table 3. Memory Organization

Table 3. Memory Organization

Part Number

Three areas configuration

Two areas configuration

Area 0

Area 1

Area 2

Area 0

Area 1

ST25TV512

Block 0

Block 1 to 7

Block 8 to 15

Block 0

Block 1 to 15

ST25TV02K

Block 0

Block 1 to 31

Block 32 to 63

Block 0

Block 1 to 63

Each area has a distinct access privilege as explained below:

•

Area 0 is always readable. It can be locked.

•

Areas 1 and 2 can be protected in read and/or write access by password.

Each block of Areas 1 and 2 can be individually locked (see Section 5.2 Data protection).

4.3

System configuration area

In addition to the user memory, the ST25TV02K/512 include a set of registers located in the system configuration

area memory (EEPROM nonvolatile registers). These registers are set during device configuration (i.e.: area

extension), or by the application (i.e.: area protection)., their content is read during the boot sequence and defines

basic ST25TV02K/512 behaviour.

The registers located in the system configuration area can be accessed via dedicated Read Configuration and

Write Configuration commands, with a pointer acting as the register address.

The configuration security session must first be open, by presenting a valid configuration password, to grant write

access to system configuration registers.

Table 4 shows the complete map of the system configuration area.

ST25TV02K ST25TV512

User memory

DS12074 - Rev 11

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