SL3ICS3001 datasheet(35/54 Pages) NXP

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SL3ICS3001_072831

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 9 July 2012

072831

35 of 54

NXP Semiconductors

SL3ICS3001

UCODE HSL

11.3 Identification commands

Identification commands are used to run the multiple tag identification protocol.

11.3.1 FAIL

The identification algorithm uses FAIL when more than one tag tried to identify itself at the

same time. Some tags back off and some tags retransmit.

In case its internal counter COUNT is not zero or the random generator result is ‘1’, then

COUNT shall be increased by ‘1’, unless it is FFh.

If the resulting COUNT value is ‘0’, then the tag reads its UID and sends it back.

11.3.2 SUCCESS

SUCCESS initiates identification of the next set of tags. It is used in two cases:

• When all tags receiving FAIL backed off and did not transmit, SUCCESS causes

those same tags to transmit again.

• After any read or write command moved an identified tag to DATA_EXCHANGE,

SUCCESS causes the next subset of selected but unidentified tags to transmit.

In case its internal counter COUNT is not zero, it will be decreased by ‘1’.

If the resulting COUNT value is ‘0’, then the tag reads its UID and sends it back.

Command sequence

Preamble Start Delimiter Command CRC

Response sequence in case of COUNT equals zero

Return Preamble ID

CRC

Command sequence

Preamble Start Delimiter Command CRC

Response sequence in case of COUNT equals zero

Return Preamble ID

CRC

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