SL3ICS1002 datasheet(26/56 Pages) NXP

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139036

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Product data sheet

COMPANY PUBLIC

Rev. 3.6 — 10 March 2011

139036

26 of 56

NXP Semiconductors

SL3ICS1002/1202

UCODE G2XM and G2XL

14.3 Link timing

For the interrogator interacting with a UCODE G2X equipped tag population exact link and

response timing requirements must be fulfilled, which can be found in Section 18, Ref. 1,

chapter 6.3.1.6.

14.3.1 Regeneration time

The regeneration time is the time required if a G2X is to demodulate the interrogator

signal, measured from the last falling edge of the last bit of the G2X response to the first

falling edge of the interrogator transmission. This time is referred to as T2 and can vary

between 3.0 Tpri and 20 Tpri. For a more detailed description refer to Section 18, Ref. 1,

chapter 6.3.1.6.

14.3.2 Start-up time

For a detailed description refer to Section 18, Ref. 1, chapter 6.3.1.3.4.

14.3.3 Persistence time

An interrogator chooses one of four sessions and inventories tags within that session

(denoted S0, S1, S2, and S3). The interrogator and associated UCODE G2X population

operate in one and only one session for the duration of an inventory round (defined

above). For each session, a corresponding inventoried flag is maintained. Sessions allow

tags to keep track of their inventoried status separately for each of four possible

time-interleaved inventory processes, using an independent inventoried flag for each

process. Two or more interrogators can use sessions to independently inventory a

common UCODE G2X chip population.

A session flag indicates whether a G2X may respond to an interrogator. G2X chips

maintain a separate inventoried flag for each of four sessions; each flag has symmetric A

and B values. Within any given session, interrogators typically inventory tags from A to B

followed by a re-inventory of tags from B back to A (or vice versa).

Additionally, the G2X has implemented a selected flag, SL, which an interrogator may

assert or deassert using a Select command.

For a description of Inventoried flags S0 – S3 refer to Section 18, Ref. 1 chapter 6.3.2.2

and for a description of the Selected flag refer to Section 18, Ref. 1, chapter 6.3.2.3. For

tag flags and respective persistence time refer to Section 18, Ref. 1, table 6.14.

14.4 Bit and byte ordering

The transmission order for all R=>T and T=>R communications respects the following

conventions:

• within each message, the most-significant word is transmitted first, and

• within each word, the most-significant bit (MSB) is transmitted first,

whereas one word is composed of 16 bits.

To represent memory addresses and mask lengths EBV-8 values are used. An extensible

bit vector (EBV) is a data structure with an extensible data range. For a more detailed

explanation refer to Section 18, Ref. 1, Annex A.

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