1、 ANSI/INCITS/ISO/IEC 21481:20122015 (ISO/IEC 21481:2012, IDT) Information technology - Telecommunications and information exchange between systems - Near Field Communication Interface and Protocol -2 (NFCIP-2) ANSI/INCITS/ISO/IEC 21481:20122015 PDF disclaimer This PDF file may contain embedded typef
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5、chnology Standards) as an American National Standard. Date of ANSI Approval: 12/22/2015 Published by American National Standards Institute, 25 West 43rd Street, New York, New York 10036 Copyright 2015 by Information Technology Industry Council (ITI). All rights reserved. These materials are subject
6、to copyright claims of International Standardization Organization (ISO), International Electrotechnical Commission (IEC), American National Standards Institute (ANSI), and Information Technology Industry Council (ITI). Not for resale. No part of this publication may be reproduced in any form, includ
7、ing an electronic retrieval system, without the prior written permission of ITI. All requests pertaining to this standard should be submitted to ITI, 1101 K Street NW, Suite 610, Washington DC 20005. Printed in the United States of America ii ITIC 2015 All rights reserved ISO/IEC 21481:2012(E)Forewo
8、rdISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical com
9、mittees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
10、 work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of the joint technical committee is to prepare International S
11、tandards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.Attention is drawn to the possibility that some of the elem
12、ents of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO/IEC 21481 was prepared by Ecma International (as ECMA-352) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC
13、1, Information technology, in parallel with its approval by national bodies of ISO and IEC.This second edition cancels and replaces the first edition (ISO/IEC 21481:2005), which has been technically revised. ISO/IEC 2012 All rights reserved iiiISO/IEC 21481:2012(E)IntroductionIn 2002, Ecma Internati
14、onal formed Task Group 19 of Technical Committee 32 to specify Near Field Communication (NFC) signal interfaces and protocols. The NFC devices are wireless closely coupled devices communicating at 13,56 MHz.Although ISO/IEC 18092 (NFCIP-1), ISO/IEC 14443 and ISO/IEC 15693 all specify 13,56 MHz as th
15、eir working frequency, they specify distinct communication modes. These are defined as NFC, PCD, and VCD communication modes, respectively.This International Standard (NFCIP-2) specifies the mechanism to detect and select one communication mode out of those three possible communication modes. Furthe
16、rmore, NFCIP-2 requires that subsequent behaviour be as specified in the standard specifying the selected communication mode.In 2009, JTC 1/SC 6 and JTC 1/SC 17 studied together for improving interoperability between ISO/IEC 21481 and ISO/IEC 14443. This second edition of ISO/IEC 21481 is revised ba
17、sed on the study, and the PICC mode is added to the existing three modes.iv ISO/IEC 2012 All rights reservedInformation technology Telecommunications and information exchange between systems Near Field Communication Interface and Protocol -2 (NFCIP-2)1 ScopeISO/IEC 18092, ISO/IEC 14443 and ISO/IEC 1
18、5693 specify the radio frequency signal interface, initialization, anti-collision and protocols for wireless interconnection of closely coupled devices and access to contactless integrated circuit cards operating at 13,56 MHz.This International Standard specifies the communication mode selection mec
19、hanism, designed not to disturb any ongoing communication at 13,56 MHz, for devices implementing ISO/IEC 18092, ISO/IEC 14443 or ISO/IEC 15693. This International Standard requires implementations to enter the selected communication mode as specified in the respective International Standard. The com
20、munication mode specifications, however, are outside the scope of this International Standard.2 ConformanceConforming devices implement mode selection specified in Clause 7 and implement the NFC mode, PCD mode, VCD mode, and PICC mode.3 Normative referencesThe following referenced documents are indi
21、spensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO/IEC 18092:2004, Information technology Telecommunications and information exchange betwee
22、n systems Near Field Communication Interface and Protocol (NFCIP-1)ISO/IEC 14443-2:2010, Identification cards Contact less integrated circuit cards Proxi mity cards Part 2: Radio frequency power and signal interfaceISO/IEC 14443-3:2011, Identification cards Contact less integrated circuits cards Pro
23、xi mity cards Part 3: Initialization and anticollisionISO/IEC 14443-4:2008, Identification cards Contact less integrated circuit cards Proxi mity cards Part 4: Transmission protocolISO/IEC 15693-2:2006, Identification cards Contact less integrated circuit cards Vicin ity cards Part 2: Air interface
24、and initializationISO/IEC 15693-3:2009, Identification cards Contact less integrated circuit cards Vicin ity cards Part 3: Anticollision and transmission protocol4 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.4.1HTHRESHOLDminimum value of an exter
25、nal RF fieldNOTE Adapted from ISO/IEC 18092:2004, 4.6.INTERNATIONAL STANDARD ISO/IEC 21481:2012(E) ISO/IEC 2012 All rights reserved 1ISO/IEC 21481:2012(E)4.2NFCIP-2 deviceISO/IEC 21841 entity4.3NFC MODEmode in which an NFCIP-2 device operates as specified in ISO/IEC 180924.4fcfrequency of operating
26、field (carrier frequency) as specified in ISO/IEC 14443-24.5PICC MODEmode in which an NFCIP-2 device operates as a Type A or Type B Proximity Integrated Circuit Card or Object as specified in ISO/IEC 14443-2, ISO/IEC 14443-3 and ISO/IEC 14443-44.6PCD MODEmode in which an NFCIP-2 device operates as a
27、 Proximity Coupling Device as specified in ISO/IEC 14443-2, ISO/IEC 14443-3 and ISO/IEC 14443-44.7VCD MODEmode in which an NFCIP-2 device operates as a Vicinity Coupling Device as specified in ISO/IEC 15693-2 and ISO/IEC 15693-35 Conventions and notations5.1 NamesThe names of basic elements, e.g. sp
28、ecific fields, are written with a capital initial letter.6 External RF field detectionDuring external RF field detection, NFCIP-2 devices shall, for a period of TIDT+ n TRFW (see 11.1.1 of ISO/IEC 18092:2004), detect external RF fields at fc with a value higher than HTHRESHOLDand shall not switch on
29、 their own RF field.7 Mode selection and switchingMode switching specifies the procedure for NFCIP-2 devices to enter the NFC mode, or the PCd mode or PICC mode or VCd mode selected prior to the following sequence.NFCIP-2 devices shall execute the following sequence:1. The NFCIP-2 device shall have
30、its RF field switched off.2. If the PICC mode has been selected, the NFCIP-2 device shall enter the PICC mode.3. If the NFCIP-2 device detects an external RF field, as specified in Clause 6, it shall enter the NFC mode as a Target.4. If the NFCIP-2 device does not detect an external RF field and the
31、 NFC mode has been selected, it shall enter the NFC mode as an Initiator.5. If the NFCIP-2 device does not detect an external RF field and the PCD mode or the VCd mode has been selected, it shall perform external RF field detection and Initial RF generation as specified in Clause 8.2 ISO/IEC 2012 Al
32、l rights reservedISO/IEC 21481:2012(E)Figure 1 illustrates the above procedure.StartExternal RF field detected ? PCD MODEEND NFC MODEVCD MODENFC MODE, PCD MODE or VCD MODEselected? yesnoNFCMODERF waitingtime expiredExternalRF fielddetected orTimeout?ExternalRF fielddetected orTimeout?RF waitingtime
33、expiredNFCIP-2 device shall have its RF field switched offPCD MODEVCD MODEPICC MODEPICC MODE Selected ?noyesExternalRF field detectedExternal RF fielddetectedFigure 1 Mode selection ISO/IEC 2012 All rights reserved 3ISO/IEC 21481:2012(E)8 External RF field detection and initial RF generationWhen the
34、 NFCIP-2 device detects an external RF field, as specified in Clause 6, during the time TIDT+ n TRFWit shall recommence the procedure specified in Clause 7.If the NFCIP-2 device does not detect an external RF field during the time TIDT+ n TRFW, it shall switch on its RF field, and enter the selected
35、 communication mode while observing TIRFG. See 11.1.1 of ISO/IEC 18092:2004 for TIDT, TRFW and n. TIRFGis the initial guard-time between switching on RF field and starting modulation to send command or data. 5.1 of ISO/IEC 14443-3:2011 and 7.3 of ISO/IEC 15693-2:2006 specify TIRFGfor PCd mode and VC
36、d mode, respectively.Figure 2 illustrates the external RF field detection and initial RF generation.StartTIDTn * TRFWTIRFGTRFWRF OnData orCommandFigure 2 RF detection and initial RF generation for PCD mode and VCD mode4 ISO/IEC 2012 All rights reservedISO/IEC 21481:2012(E) ISO/IEC 2012 All rights reservedICS 35.100.20Price based on 4 pages
