This could be in part because the commands in ISO 18185 Part 1 do not incorporate
security mechanisms such as passwords.* For example, ISO 18000 Part 7 provides a
password style security mechanism by the set password, set password protect, and unlock
commands. There is also an additional layer of privacy introduced by the user id ?¬?eld. The
logic required to implement the checking of these ?¬?elds increases the total area and the
power consumption of the tag designs.
3.5 Conclusions
This chapter presents an extensible RFID tag with associated design automation ?¬‚ow. The
RFID compiler automatically generates RFID tag software or hardware for both microprocessor-
and FPGA-based extensible tags. The compiler takes as input simple descriptions
called RFID macros of the RFID primitives described in the standard and behavior for each
primitive written in C. The system is extensible, in that it allows for addition (or removal)
of a set of custom RFID primitives that may be a subset or superset of the original
standards. The physical layer blocks are automatically generated through the description
Sleep All But command
Protocol Options Interrogator Code Length Manufacturer Tag CRC
8 bit 8 bit 16 bit 8 bit 8 bit 16 bit 32 bit 16 bit
Get Seal Model command
Protocol Options Manufacturer Tag Interrogator Code Min time Max time Length CRC
8 bit 8 bit 16 bit 32 bit 16 bit 8 bit 16 bit 16 bit 8 bit 16 bit
Get Seal Model response
Protocol Status Length Interrogator Manufacturer Tag Code Model CRC
8 bit 16 bit 8 bit 16 bit 16 bit 32 bit 8 bit 16 bit
Status
Modefield State Reserved Acknowledge Reserved Seal type Reserved Reserved Battery
4 bit 2 bit 1 bit 1 bit 2 bit 3 bit 1 bit 1 bit 1 bit
FIGURE 3.
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