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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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ST25DV64K Scheda tecnica(PDF) 24 Page - STMicroelectronics |
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ST25DV64K Scheda tecnica(HTML) 24 Page - STMicroelectronics |
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24 / 220 page  Memory management ST25DV04K ST25DV16K ST25DV64K 24/220 DocID027603 Rev 4 4 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 ST25DVxxx 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 ST25DVxxx dynamic registers are accessible by RF or I2C host and provide dynamic activity status or allow temporary activation or deactivation of some ST25DVxxx 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 all ST25DVxxx 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 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 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 a RF configuration password. |
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