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AN3408 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN3408 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 38 page DocID018867 Rev 4 7/38 AN3408 Memory organization for STMicroelectronics ISO/IEC 15693 products 1 Memory organization for STMicroelectronics ISO/IEC 15693 products The ST ISO/IEC 15693 contactless tag (LRI1K, LRI2K, LRIS2K, LRIS64K) and the dual interface memory (M24LRxx) is divided into three different areas: • User memory area, where the user can read and write data. • System area, which contains UID, DSFID and AFI fields. • Protection system area, which contains the user memory area protection. Access rights to the different memory fields are given in Table 2. For more details on the protection system, refer to the corresponding STMicroelectronics datasheet. 1.1 User memory area The user memory stores NDEF messages. This area can be write-protected by the user. The user memory size depends on ISO/IEC 15693 contactless tag, as shown in Table 3. Note: M24LR64E-R and M24LR16E-R have a specific format for read and write commands. Their block number is coded on two bytes instead of one. For more details, refer to LRIS64K, M24LR16E-R and M24LR64E-R datasheets. Table 2. Access rights to memory fields Operation User memory area System area Protection system UID DSFID and AFI Read Yes Yes Yes Yes Write Yes No Yes Yes Lock Yes Locked by IC manufacturer Yes NA Table 3. ST ISO/IEC 15693 memory size LRI1K LRI2K LRIS2K LRIS64K M24LR04E-R M24LR16E-R M24LR64E-R User memory size 1 kbit 2 kbits 2 kbits 64 kbits 2 kbits 16 kbits 64 kbits 128 bytes 256 bytes 256 bytes 8192 bytes 512 bytes 2048 bytes 8192 bytes First RF block 0 0 0 0 0 0 0 Last RF block 31 63 63 2047 127 511 2047 NDEF memory size 128 bytes (1) 256 bytes (1) 256 bytes (1) 8192 bytes (1) (2) 512 bytes (1) 2048 bytes (1) (2) 8192 bytes (1) (2) 1. NDEF memory size includes User area and CC field memory area. 2. If NDEF message size exceeds 2040 bytes, bit 2 of CC3 shall be set (see Chapter 2.2: Capability container field). |
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