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SRTAG2K-D Datasheet(PDF) 13 Page - STMicroelectronics |
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SRTAG2K-D Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 51 page ![]() DocID025446 Rev 3 13/51 SRTAG2K-D SRTAG2K-D memory management 3.1.4 System file layout The system file specifies the configuration of the SRTAG2K-D. Table 6 lists the different fields. 3.2 Read and write access rights to the memory An NDEF file can be locked for read or write accesses. It is also protected by a 128-bit password that the host shall present before accessing the NDEF file. There are two 128-bit passwords, one for the read access and the other one for the write access. An NDEF file can be permanently locked for read or write accesses. Thus, the host cannot access the NDEF file. Table 5. NDEF file layout File offset Byte 0 Byte 1 Byte 2 Byte 3 0x0000 NDEF message length User data User data 0x0004 User data User data User data User data ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0x00FF ... ... ... User data Table 6. Field list File offset Field name Number of bytes Read access Write access Delivery state (1) 1. The delivery state for all passwords = 0x00000000000000000000000000000000. 0x0000 Length system file 2 RF - 0x0012 0x0002 ST reserved 1 RF none 0x01 0x0003 ST reserved 1 RF none 0x00 0x0004 RF Session field 1 RF none 0x11 0x0005 ST reserved 1 RF none 0x00 0x0006 ST reserved 1 RF none 0x01 0x0007 NDEF File number (RFU) 1 RF none 0x00 0x0008 UID 7 RF none 0x02D2 xx xx xx xx xx (2) 2. x values are defined by ST to insure UID unicity. 0x000F Memory Size 2 RF none 0x00FF 0x0011 Product Code 1 RF none 0xD2 |
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