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ST25TV02K 数据表(PDF) 8 Page - STMicroelectronics |
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ST25TV02K 数据表(HTML) 8 Page - STMicroelectronics |
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8 / 90 page  4.2 User memory User memory is addressed as blocks of 4 bytes, starting at address 0. Table 2. 2Kb user memory as seen by RF shows how memory is seen from RF interface. Table 2. 2Kb user memory as seen by RF RF command (block addressing) User memory Read Single Block Read Multiple Blocks Fast Read Single Block Fast Read Multiple Blocks Write Single Block Inventory Read Fast Inventory Read RF block 00h Byte 0003h Byte 0002h Byte 0001h Byte 0000h RF block 01h Byte 0007h Byte 0006h Byte 0005h Byte 0004h RF block 02h Byte 0011h Byte 0010h Byte 0009h Byte 0008h .... RF block 3Fh Byte 03FFh Byte 03FEh Byte 03FDh Byte 03FCh 4.2.1 User memory areas The user memory can be split into two or three different areas as showed in Table 3. Memory Organization Table 3. Memory Organization Part Number Three areas configuration Two areas configuration Area 0 Area 1 Area 2 Area 0 Area 1 ST25TV512 Block 0 Block 1 to 7 Block 8 to 15 Block 0 Block 1 to 15 ST25TV02K Block 0 Block 1 to 31 Block 32 to 63 Block 0 Block 1 to 63 Each area has a distinct access privilege as explained below: • Area 0 is always readable. It can be locked. • Areas 1 and 2 can be protected in read and/or write access by password. Each block of Areas 1 and 2 can be individually locked (see Section 5.2 Data protection). 4.3 System configuration area In addition to the user memory, the ST25TV02K/512 include a set of registers located in the system configuration area memory (EEPROM nonvolatile registers). These registers are set during device configuration (i.e.: area extension), or by the application (i.e.: area protection)., their content is read during the boot sequence and defines basic ST25TV02K/512 behaviour. The registers located in the system configuration area can be accessed via dedicated Read Configuration and Write Configuration commands, with a pointer acting as the register address. The configuration security session must first be open, by presenting a valid configuration password, to grant write access to system configuration registers. Table 4 shows the complete map of the system configuration area. ST25TV02K ST25TV512 User memory DS12074 - Rev 11 page 8/90 |
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