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AS3956 数据表(PDF) 29 Page - ams AG |
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AS3956 数据表(HTML) 29 Page - ams AG |
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29 / 109 page  ams Datasheet Page 29 [v1-10] 2018-Apr-27 Document Feedback AS3956 − Detailed Description Memory Organization AS3956 contains an embedded EEPROM module which can be accessed via RF or SPI / I²C interface. EEPROM contains 4096 bits (512 bytes) organized in 128 blocks of 4 bytes each. Blocks in EEPROM are numbered from 00h to 7Fh. Bits in a block are numbered from 0 to 31. Most of the EEPROM is NFC Type 2 Tag user data area (472 bytes). The position of the dynamic lock bits is fixed at the end of NFC Type 2 Tag user data area (blocks 7Ah and 7Bh). The configuration bits which define AS3956 operating options are stored in blocks 01h, 7Ch, 7Dh, 7Eh, 7Fh. Housekeeping information is stored in block 00h. 4kbit EEPROM organization is shown in Figure 27. 4kbit EEPROM Organization Numbers of dynamic lock bits: • Data area size in bytes: 4*(127 – 3) – 7 – 17 = 472 bytes • Number of dynamic lock bits: (472 – 48) / 8 = 53 bits (53 bits) |
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