Tag-to-reader protocol

XRAG2

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6.1.6

Tag-to-reader Miller sub carrier modulation preamble

As for the FM0 base band modulation, the Tag supports the two Miller subcarrier

modulation preamble formats, according to the TRext parameter, as specified in the

EPCglobal Class 1 generation 2 RFID UHF specification, revision 1.0.9.

Figure 15 shows Miller preamble according to the value of the TRext parameter of the Query

command starting the inventory round.

Figure 15.

Tag-to-reader Miller Preamble

6.1.7

Tag-to-reader Miller subcarrier modulation end of signaling

In accordance with the EPCglobal Class 1 generation 2 RFID UHF specification, revision

1.0.9, the tag miller subcarrier modulation signaling ends with a dummy ‘1’. Figure 16 shows

the different possible Miller subcarrier modulation end of signaling sequences.

M=2

M=4

M=8

Miller preamble (TRext = 0)

010111

4M/LF

01

0

1

1

1

4M/LF

Miller preamble (TRext = 1)

0

1

0111

16M/LF

M=2

M=4

010

1

1

1

16M/LF

01

0111

16M/LF

M=8

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