19
Speci?¬?cation methodology and compilation ?¬‚ow. (From Jones, A.K., Hoare, R., Dontharaju, S., Tung, S., Sprang,
R., Fazekas, J., Cain, J.T., and Mickle, M.H., Proceedings of FCCM, 165, 2006. With permission.)
48 RFID Handbook: Applications, Technology, Security, and Privacy
of each necessary primitive and its corresponding response are both illustrated in
Figure 3.21.
The command code of each RFID primitive is a unique ?¬?eld or opcode that serves as the
identi?¬?er. Each of the RFID primitives also contains a subset of ?¬?elds with varying lengths
providing positions for data present in a command, as can be inferred from Figure 3.21.
Similarly, the tag response to each RFID primitive has ?¬?elds of varying lengths.
Each RFID macro description contains a relatively short character string corresponding
to the speci?¬?c name of the primitive, a number indicating how many bits are used to
represent the opcode of this particular primitive as well as the distinct number corresponding
to the value of the opcode. Additionally, a set of operands that correspond to the
primitive is included. On the next line, a set of operands is included that corresponds to
the standard response.
Figure 3.22 shows an example RFID macros ?¬?le containing the basic primitives of the
ISO 18000 Part 6C standard for initiating a transaction as well as the Write primitive.
Pages:
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119