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NXP Semiconductors

SL2S3003/SL2S3003TT

ICODE 3 (TagTamper)

SOF

Flags

CRC16

EOF

8 bits

16 bits

Table 80. ENABLE PRIVACY response format when Error_flag NOT set

8.5.3.10 INVENTORY READ

Command code = A0h

When receiving the INVENTORY READ request, the ICODE 3 IC performs the anti-collision sequence, but

instead of the UID and the DSFID in the response, there are additional options.

The INVENTORY READ command generates two modes which are defined by the most significant bit of the

mask length byte as follows:

• Standard mode (MSB mask length byte equal 0)

The standard mode of the INVENTORY READ command is fully backward compatible to the ICODE SLI and

ICODE SLIX ( Standard mode ).

• Extended mode (MSB mask length byte equal 1)

The extended mode supports additional features to optimize the inventory procedure for different

requirements ( Extended Mode ).

Standard mode

If MSB mask length byte equals 0, the INVENTORY READ command is used in the standard mode.

If the Inventory_flag is set to 1 and an error is detected, the ICODE 3 IC remains silent.

If the Option flag is set to logic 0, n blocks of data are re-transmitted. If the Option flag is set to 1, n blocks of

data and the part of the UID which is not part of the mask are re-transmitted.

The request contains:

• Flags

• INVENTORY READ command code

• IC manufacturer code

• AFI (if AFI flag set)

• Mask length (most significant bit equal 0)

• Mask value (if mask length > 0)

• First block number to be read

• Number of blocks to be read

• CRC 16

SOF Flags

INVENTORY

READ

IC Mfg

code

AFI

Mask

length

Mask

value

First block

number

Number

of blocks

CRC16

EOF

8 bits

optional

8 bits

0 to 64

bits

8 bits

16 bits

Table 81. INVENTORY READ request format

If the Inventory_flag is set to logic 1, only the tags in the READY or SELECTED state respond (same behavior

as in the INVENTORY command). The meaning of flags 5 to 8 is in accordance with table 5 in ISO/IEC 15693-3

[3].

SL2S3003/SL2S3003TT

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.0 — 28 March 2024

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