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ATA555811-PP Datasheet(PDF) 8 Page - ATMEL Corporation |
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ATA555811-PP Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 42 page  8 4681C–RFID–09/05 ATA5558 [Preliminary] 2.7.3 Master Key The Master Key controls various operating modes as described in Table 2-2. For production test purposes, other Master Key codes are used, but once the Configuration block has been double locked these test functions can never be reactivated. If the Master Key is set to 0110, the blocks within the system memory section have different access protection (see Figure 2-5 on page 7). These access rights are fixed and not influenced by the Page Security Register. Access to password protected system memory blocks can only be performed after the corresponding LoginWrite or LoginRead has been successfully executed. The password blocks themselves are non-readable. Traceability and configuration can always be read but the traceability data cannot be altered. A new ATA5558 device, when received by the customer can be considered as being unpro- grammed (all 0 state), the only exception to this being the preprogrammed non-alterable traceability information. For the tag manufacturer to be able to easily set up the tag passwords, it is possible to provisionally switch the password protection off. i.e Master Key = 0. In this state, it is possible to read and write all non-locked (lock bits = 0) memory blocks irrespective of the page security. In this way, new tag passwords or Tag ID’s can be defined and written. Blocks, which have once been locked (block lock bit = 1) can however not be rewritten. When the cus- tomer has completed the tag configuration, the Master Key is set to the “safe” state (= 6) thus enabling the full password protection, and then finally the configuration block itself may be locked. In this double locked condition, the configuration and all other locked blocks are irrevers- ibly set and cannot be changed. This applies to both the user and the majority of the system memory blocks. Table 2-2. Master Key Related Functions Master Key Enables Protection Scheme DDR PM EAS User Memory Clear Page Security System Memory 6 yes yes yes no yes yes 9 yes yes yes yes yes yes others no no no yes no no |
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