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81 / 133 page NXP Semiconductors NTP53x2 NTAG 5 link - NFC Forum-compliant I2C bridge NTP53x2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 3.3 — 3 July 2020 COMPANY PUBLIC 544533 81 / 133 When receiving the INVENTORY READ request, NTAG 5 link performs the same as the anti-collision sequence, with the difference that instead of the UID and the DSFID, the requested response is defined by additional options. The INVENTORY READ command provides two modes which are defined by the most significant bit of the mask length byte as follows: • Standard mode (most significant bit of mask length byte equal 0b) (see Section 8.2.3.5.1.1) • Extended mode (most significant bit of mask length byte equal 1b) The extended mode offers additional features to optimize the inventory procedure for different requirements (see Section 8.2.3.5.1.2) The INVENTORY READ command may also be transmitted in addressed or SELECTED mode. Then the command behaves similar to a READ or READ MULTIPLE BLOCK (see Section 8.2.3.5.1.3). 8.2.3.5.1.1 Standard mode If most significant bit of mask length byte is equal 0b the INVENTORY READ command is used in the standard mode. If the Inventory_flag is set to 1b and an error is detected, NTAG 5 link remains silent. If the Option flag is set to 0b, n blocks of data are transmitted. If the Option flag is set to 1b, n blocks of data and the part of the UID which is not part of the mask are transmitted. The request contains: • Flags • INVENTORY READ command code • IC manufacturer code • AFI (if AFI_flag is set to 1b) • Mask length (most significant bit equal 0b) • Mask value (if mask length > 00h) • First block number to be read • Number of blocks to be read • CRC 16 Table 172. INVENTORY READ request format Flags INVENTORY READ Manuf. code AFI Mask length Mask value First block number Number of blocks CRC16 8 bits 8 bits 8 bits 8 bits (optional) 8 bits 0 to 8 bytes 8 bits 8 bits 16 bits If the Inventory_flag is set to 1b, only NTAG 5 link in the READY or SELECTED (SECURE) state will respond (same behavior as in the INVENTORY command). The meaning of Flags bits 7 to 4 is as defined in ISO/IEC 15693. The INVENTORY READ command can also be transmitted in the addressed or SELECTED mode (see Section 8.2.3.5.1.3). The number of blocks in the request is one less than the number of blocks that NTAG 5 link returns in its response. If the Option_flag in the request is set to logic 0b the response contains: |
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