ST25DV64K datasheet(10/197 Pages) STMICROELECTRONICS

10 / 197 page

Memory management

4.1

Memory organization overview

The ST25DVxxx memory is divided in four main memory areas:

•

User memory

•

Dynamic registers

•

Fast transfer mode buffer

•

System configuration area

The user memory can be divided into four flexible areas. Each area can be individually read- and/or write-

protected with one out of three specific 64-bit password.

The ST25DVxxx dynamic registers are accessible by RF or I2C host and provide dynamic activity status or allow

temporary activation or deactivation of some features.

The ST25DVxxx also provides a 256-byte fast transfer mode buffer, acting as a mailbox between RF and I2C

interface, allowing fast data transfer between contact and contactless worlds.

Finally, the ST25DVxxx system configuration area contains static registers to configure the device features, which

can be tuned by user. Its access is protected by a 64-bit configuration password.

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

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

DSFID (default 00h) registers. 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 five additional 64-bit blocks that store an I2C password plus three RF user

area access passwords, and an RF configuration password.

ST25DV04K ST25DV16K ST25DV64K

Memory management

DS10925 - Rev 11

page 10/197

ST25DV64K Scheda tecnica(PDF) 10 Page - STMicroelectronics