MB89R112 datasheet(15/49 Pages) RAMXEED

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MB89R112

DS411-00004-3v0-E

10. Execution of Inventory Command by a Transponder

A transponder returns a response to the reader/writer when its UID is equal to the value that consists of the

mask value and the number of slots. The mask value is sent in the Inventory command, and the number of

slots is determined by the number of times the EOF signal is transmitted.



Algorithm for execution of processing by a transponder

The following figure shows the algorithm for the execution of processing by a transponder when an Inventory

command is received. The next figure shows the relationship between the UID and the mask value.

Nb_slots_flag=1?

SN_length=0

SN_length=4

YES

Slot_Frame=SOF?

Slot_Frame=EOF?

YES

Wait (Slot_Frame)

YES

SN = 0

NbS = 1

NbS = 16

SN = SN + 1

SN < NbS-1

NbS

: Total number of slots (1 or 16)

: Current slot number

LSB (value, n) : The “n” least significant bits of value

: Concatenation operator

Slot_Frame

: SOF or EOF

LSB (UID, SN_length  mask length) 

LSB (SN, SN_length) & LSB (mask,

mask length) ?



Algorithm for Execution of Processing by a Transponder when Inventory Command

Response transmission

End of processing

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