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LRI64-A6S2U Datasheet(PDF) 8 Page - STMicroelectronics |
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LRI64-A6S2U Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 52 page Description LRI64 8/52 1.1 Memory mapping The LRI64 is organized as 15 blocks of 8 bits as shown in Figure 3. Each block is automatically write-protected after the first valid write access. Figure 3. LRI64 memory mapping The LRI64 uses the first 8 blocks (blocks 0 to 7) to store the 64-bit Unique Identifier (UID). The UID is used during the anti-collision sequence (Inventory). It is written, by ST, at time of manufacture, but part of it can be customer-accessible and customer-writable, on special request. The LRI64 has an AFI register, in which to store the Application Family Identifier value, which is also used during the anti-collision sequence. The LRI64 has a DSFID register, in which to store the Data Storage Format Identifier value, which is used for the LRI64 Inventory answer. The five following blocks (blocks 10 to 14) are Write-Once Read-Many (WORM) memory. It is possible to write to each of them once. After the first valid write access, the block is automatically locked, and only read commands are possible. AI09741 Block Addr 01234567 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 UID 0 UID 1 UID 2 UID 3 UID 4 UID 5 = IC_ID UID 6 = 02h UID 7 = E0h AFI (WORM Area) DSFID (WORM Area) WORM Area WORM Area WORM Area WORM Area WORM Area |
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