SL3ICS1002F7AF datasheet(22/51 Pages) NXP

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139037

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Product data sheet

COMPANY PUBLIC

Rev. 3.7 — 9 October 2012

139037

22 of 51

NXP Semiconductors

SL3ICS1002/1202

UCODE G2XM and G2XL

14. TAG selection, inventory and access

This section contains all information including commands by which a reader selects,

inventories, and accesses a G2X population

An interrogator manages UCODE G2X equipped tag populations using three basic

operations. Each of these operations comprises one or more commands. The operations

are defined as follows

Select:

The process by which an interrogator selects a tag population for inventory

and access. Interrogators may use one or more Select commands to select a

particular tag population prior to inventory.

Inventory:

The process by which an interrogator identifies UCODE G2X equipped tags.

An interrogator begins an inventory round by transmitting a Query command

in one of four sessions. One or more G2X may reply. The interrogator detects

a single G2X reply and requests the PC, EPC, and CRC-16 from the chip. An

inventory round operates in one and only one session at a time. For an

example of an interrogator inventorying and accessing a single G2X refer to

Section 17, Ref. 1, Annex E.

Access:

The process by which an interrogator transacts with (reads from or writes to)

individual G2X. An individual G2X must be uniquely identified prior to access.

Access comprises multiple commands, some of which employ one-time-pad

based cover-coding of the R=>T link.

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