SL3ICS1002 datasheet(24/56 Pages) NXP

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139036

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Product data sheet

COMPANY PUBLIC

Rev. 3.6 — 10 March 2011

139036

24 of 56

NXP Semiconductors

SL3ICS1002/1202

UCODE G2XM and G2XL

14. Physical layer and signaling

14.1 Reader to G2X communication

14.1.1 Physical layer

For interrogator-to-G2X link modulation refer to Section 18, Ref. 1, annex H.1 Baseband

waveforms, modulated RF, and detected waveforms.

14.1.2 Modulation

An interrogator sends information to one or more G2X by modulating an RF carrier using

double-sideband amplitude shift keying (DSB-ASK), single-sideband amplitude shift

keying (SSB-ASK) or phase-reversal amplitude shift keying (PR-ASK) using a

pulse-interval encoding (PIE) format. The G2X receives the operating energy from this

same modulated RF carrier.

Section 18, Ref. 1: Annex H, as well as chapter 6.3.1.2.2.

The G2X is capable of demodulating all three modulation types.

14.1.3 Data encoding

The R=>T link is using PIE. For the definition of the therefore relevant reference time

interval for interrogator-to-chip signaling (Tari) refer to Section 18, Ref. 1, chapter

6.3.1.2.3. The Tari is specified as the duration of a data-0.

14.1.4 Data rates

Interrogators shall communicate using Tari values between 6.25

μs and 25 μs, inclusive.

For interrogator compliance evaluation the preferred Tari values of 6.25

μs, 12.5 μs or

μs should be used. For further details refer to Section 18, Ref. 1, chapter 6.3.1.2.4.

14.1.5 RF envelope for R=>T

A specification of the relevant RF envelope parameters can be found in Section 18,

Ref. 1, chapter 6.3.1.2.5.

14.1.6 Interrogator power-up/down waveform

For a specification of the interrogator power-up and power-down RF envelope and

waveform parameters refer to Section 18, Ref. 1, chapters 6.3.1.2.6 and 6.3.1.2.7.

14.1.7 Preamble and frame-sync

An interrogator shall begin all R=>T signaling with either a preamble or a frame-sync. A

preamble shall precede a Query command and denotes the start of an inventory round.

For a definition and explanation of the relevant R=>T preamble and frame-sync refer to

Section 18, Ref. 1, chapter 6.3.1.2.8.

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