LRI512 datasheet(23/54 Pages) STMICROELECTRONICS

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LRI512

Figure 31. Principle of Comparison between the Mask, Slot Number and UID

The AFI field shall be present if the AFI_flag is set.

The pulse shall be generated according to the def-

inition of the EOF in ISO/IEC 15693-2.

The first slot starts immediately after the reception

of the Request EOF.

To switch to the next slot, the VCD sends an EOF.

The following rules and restrictions apply:

– if no LRI512 answer is detected, the VCD may

switch to the next slot by sending an EOF

– if one or more LRI512 answers are detected, the

VCD shall wait until the complete frame has

been received before sending an EOF for

switching to the next slot.

AI06682

Mask value received in the Inventory command

0000 0100 1100 1111 b 16 bits

The Mask value less the padding 0s is loaded

into the Tag comparator

100 1100 1111 b 11 bits

The Slot counter is calculated

xxxx

Nb_slots_flags = 0 (16 slots), Slot Counter is 4 bits

The Slot counter is concatened to the Mask value

xxxx 100 1100 1111 b

Nb_slots_flags = 0

15 bits

The concatenated result is compared with

the least significant bits of the Tag UID.

xxxx xxxx ..... xxxx xxxx x xxx xxxx xxxx xxxx

64 bits

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

b63

Compare

Bits ignored

UID

4 bits

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