ST25DV64KC datasheet(11/203 Pages) STMICROELECTRONICS

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Memory management

4.1

Memory organization overview

The ST25DVxxKC memory is divided in four main memory areas:

•

User memory

•

Dynamic registers

•

Fast transfer mode buffer

•

System configuration area

The ST25DVxxKC user memory can be divided into 4 flexible user areas. Each area can be individually read -

and/or - write-protected with one out of three specific 64-bit password.

The ST25DVxxKC dynamic registers are accessible by RF or I2C host and provide dynamic activity status or

allow temporary activation or deactivation of some ST25DVxxKC features.

The ST25DVxxKC 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 ST25DVxxKC system configuration area contains static registers to configure all ST25DVxxKC

features, which can be tuned by the 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 that is 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

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.

ST25DV04KC ST25DV16KC ST25DV64KC

Memory management

DS13519 - Rev 3

page 11/203

ST25DV64KC Scheda tecnica(PDF) 11 Page - STMicroelectronics