M24LR64-R_1006 datasheet(68/128 Pages) STMICROELECTRONICS

68 / 128 page

Anticollision

M24LR64-R

68/128

Doc ID 15170 Rev 10

Figure 50.

Principle of comparison between the mask, the slot number and the UID

The AFI field is present if the AFI_flag is set.

The pulse is generated according to the definition 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 M24LR64-R answer is detected, the VCD may switch to the next slot by sending

an EOF,

●

if one or more M24LR64-R answers are detected, the VCD waits 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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