1、 Reference numberECMA-123:2009Ecma International 2009ECMA-352 3rdEdition / June 2013 Near Field Communication Interface and Protocol -2 (NFCIP-2) COPYRIGHT PROTECTED DOCUMENT Ecma International 2013 Ecma International 2013 iContents Page 1 Scope 1 2 Conformance . 1 3 Normative references 1 4 Terms a
2、nd definitions . 1 5 Conventions and notations 2 5.1 Names . 2 6 External RF field detection . 2 7 Mode selection and switching . 2 8 External RF field detection and initial RF generation 4 ii Ecma International 2013Introduction In 2002, Ecma International formed Task Group 19 of Technical Committee
3、 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 ECMA-340, ISO/IEC 14443 and ISO/IEC 15693 standards all specify 13,56 MHz as their working frequency, they specify distinct communi
4、cation modes. These are defined as NFC, PCD and VCD communication modes respectively. This NFCIP-2 Standard specifies the mechanism to detect and select one communication mode out of those three possible communication modes. Furthermore, NFCIP-2 requires that subsequent behaviour be as specified in
5、the standard specifying the selected communication mode. The 2ndedition adds support for the PICC mode from ISO/IEC 14443. 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 base
6、d on the study, and the PICC mode is added to the existing three modes. This 3rdedition is aligned with ISO/IEC 21481:2012. This Ecma Standard has been adopted by the General Assembly of June 2013. Ecma International 2013 iii“COPYRIGHT NOTICE 2013 Ecma International This document may be copied, publ
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13、INFRINGE ANY OWNERSHIP RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.“ iv Ecma International 2013Near Field Communication Interface and Protocol -2 (NFCIP-2) 1 Scope ECMA-340, ISO/IEC 14443 and ISO/IEC 15693 specify the radio frequency signal interface, init
14、ialization, anti-collision and protocols for wireless interconnection of closely coupled devices and access to contactless integrated circuit cards operating at 13,56 MHz. This Standard specifies the communication mode selection mechanism, designed not to disturb any ongoing communication at 13,56 M
15、Hz, for devices implementing ECMA-340, ISO/IEC 14443 or ISO/IEC 15693. This Standard requires implementations to enter the selected communication mode as specified in the respective Standard. The communication mode specifications, however, are outside the scope of this Standard. 2 Conformance Confor
16、ming devices implement mode selection specified in Clause 7 and implement the NFC MODE, PCD MODE, VCD MODE, and PICC MODE. 3 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undat
17、ed references, the latest edition of the referenced document (including any amendments) applies. ECMA-340, Near Field Communication Interface and Protocol (NFCIP-1) ISO/IEC 14443-2:2010, Identification cards Contactless integrated circuit cards Proximity cards Part 2: Radio frequency power and signa
18、l interface ISO/IEC 14443-3:2011, Identification cards Contactless integrated circuits cards Proximity cards Part 3: Initialization and anticollision ISO/IEC 14443-4:2008, Identification cards Contactless integrated circuit cards Proximity cards Part 4: Transmission protocol ISO/IEC 15693-2:2006, Id
19、entification cards Contactless integrated circuit cards Vicinity cards Part 2: Air interface and initialization ISO/IEC 15693-3:2009, Identification cards Contactless integrated circuit cards Vicinity cards Part 3: Anticollision and transmission protocol 4 Terms and definitions For the purposes of t
20、his document, the following terms and definitions apply. 4.1 HTHRESHOLDminimum value of an external RF field Ecma International 2013 1NOTE Adapted from ECMA-340, 4.6. 4.2 NFCIP-2 device ISO/IEC 21841 entity 4.3 NFC MODE mode in which an NFCIP-2 device operates as specified in ECMA-340 4.4 fc frequen
21、cy of operating field (carrier frequency) as specified in ISO/IEC 14443-2 4.5 PICC MODE mode 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 14443-4 4.6 PCD MODE mode in which an NFCIP-
22、2 device operates as a Proximity Coupling Device as specified in ISO/IEC 14443-2, ISO/IEC 14443-3 and ISO/IEC 14443-4 4.7 VCD MODE mode in which an NFCIP-2 device operates as a Vicinity Coupling Device as specified in ISO/IEC 15693-2 and ISO/IEC 15693-3 5 Conventions and notations 5.1 Names The name
23、s of basic elements, e.g. specific fields, are written with a capital initial letter. 6 External RF field detection During external RF field detection, NFCIP-2 devices shall, for a period of TIDT+ n TRFW (see 11.1.1 of ECMA-340), detect external RF fields at fc with a value higher than HTHRESHOLDand
24、 shall not switch on their own RF field. 7 Mode selection and switching Mode 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 NF
25、CIP-2 device shall have 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. 2 Ecma International 20134. If the NFCIP-2
26、 device does not detect an external RF field and the 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
27、generation as specified in Clause 8. 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
28、expiredNFCIP-2 device shall have its RF field switched offPCD MODEVCD MODEPICC MODEPICC MODE Selected ?noyesExternalRF field detectedExternal RF fielddetectedFigure 1 Mode selection Ecma International 2013 34 Ecma International 20138 External RF field detection and initial RF generation When the NFC
29、IP-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 co
30、mmunication mode while observing TIRFG. See 11.1.1 of ECMA-340 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 VCD 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 MODE Ecma International 2013
