LRIS64K datasheet(11/100 Pages) STMICROELECTRONICS

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LRIS64K

User memory organization

Doc ID 15336 Rev 11

11/100

User memory organization

The LRIS64K is divided into 64 sectors of 32 blocks of 32 bits as shown in Table 2. Figure 2

shows the memory sector organization. Each sector can be individually read- and/or write-

protected using a specific password command. Read and write operations are possible if

the addressed data are not in a protected sector.

The LRIS64K also has a 64-bit block that is used to store the 64-bit unique identifier (UID).

The UID is compliant with the ISO/IEC 15963 description, and its value is used during the

anticollision sequence (Inventory). This block is not accessible by the user and its value is

written by ST on the production line.

The LRIS64K includes an AFI register that stores the application family identifier, and a

DSFID register that stores the data storage family identifier used in the anticollision

algorithm.

The LRIS64K has three additional 32-bit blocks that store the RF password codes.

Figure 2.

Memory sector organization

Sector details

The LRIS64K user memory is divided into 64 sectors. Each sector contains 1024 bits. The

protection scheme is described in Section 3: System memory area.

A sector provides 32 blocks of 32 bits. Each read and write access are done by block. Read

and write block accesses are controlled by a Sector Security Status byte that defines the

access rights to all the 32 blocks contained in the sector. If the sector is not protected, a

Write command updates the complete 32 bits of the selected block.

LRIS64K Datasheet(PDF) 11 Page - STMicroelectronics