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SB nº 303: Adding an Optional Suspend and a Mandatory Suspend in the Polling Loop

v2.0 Specification Bulletins
Contactless Acceptance Device

EMV® Specification Bulletin No. 303 Second Edition May 2024 Adding an Optional Suspend and a Mandatory Suspend in the Polling Loop This Specification Bulletin describes the specification change related to the introduction in the Polling Loop of an optional suspend of the Operating Field when no other technologies are supported and a mandatory suspend of the Operating Field when other technologies are supported.

Applicability

This Specification Bulletin applies to:

  • EMV Level 1 Specifications for Payment Systems, EMV Contactless Interface Specification, Version 3.2 – July 2022.

Related Documents

  • None

Description

This Specification Bulletin introduces an optional suspend of the Operating Field (between 5 ms and 30 ms) in the polling loop when no other technologies are supported. When other technologies are supported, then it replaces the mandatory reset of the Operating Field with a mandatory suspend of the Operating Field.

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Specification Changes Add a new section 3.2.10:

3.2.10 PCD Requirements for Suspending the Operating Field This section specifies how the PCD performs a suspend of the Operating Field. Table 3.16 describes how to measure whether the Operating Field is correctly suspended by the PCD. Table 3.16: Measurement of Suspending the Operating Field Step # Action Step 1 Activate the PCD to execute the polling loop. Step 2 Place the [ISO/IEC 10373-6] calibration coil 1 in the Operating Volume of the PCD. Step 3 Capture the signal from the start to the end of the period of the suspension of the Operating Field. Step 4 Repeat Step 3 for any second period of suspension of the Operating Field Requirements 3.6: Suspend Operating Field (PCD Transmission) PCD 3.2.10.1 When the PCD suspends the Operating Field, then within the Operating Volume, the PCD shall not generate any field for a time tSUSPEND. 1 Refer to Annex A.5 for the value of tSUSPEND. 1 Note that the minimum time for tSUSPEND guarantees the PICC is reset with a suspend of the Operating Field.

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Change Figure 9.2 – Polling as follows: Figure 9.2: Polling 1 TYPE_A = 0 TYPE_B = 0 TYPE_1 = 0 … TYPE_n = 0 2 NO TYPE_A = 0 ? YES 3 WAIT tP 4 WUPA 5 RESPONSE? NO YES 6 TYPE_A = 1 7 HLTA NO Other Type(s) YES Supported? 21 NO TYPE_A = 0 and TYPE_B = 0 YES 22 Optional SUSPEND tSUSPEND Type 1... 8 NO TYPE_B = 0 ? YES 9 WAIT tP 10 WUPB NO TYPE_1 = 0 ? YES Optional RESET tRESET Optional RESET tRESET WAIT tP1 11 RESPONSE? NO YES 12 TYPE_B = 1 POLL 1 RESPONSE? NO YES TYPE_1 = 1 Type x... 13 NO TYPE_x = 0 ? YES 14 Optional RESET tRESET 15 WAIT tPx 16 POLL x 19 Optional RESET tRESET 17 RESPONSE? NO YES 18 TYPE_x = 1 Type n NO TYPE_n = 0? YES Optional RESET tRESET WAIT tPn POLL n RESPONSE? NO YES TYPE_n = 1 20 SUSPEND tSUSPEND

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Change Requirements 9.2.1.5 and 9.2.17 as follows: Requirements 9.2: Polling PCD […] 9.2.1.5 If the PCD supports only Type A and Type B, then the PCD shall continue with 9.2.1.3. Otherwise, the PCD shall continue with 9.2.1.6. If the PCD supports only Type A and Type B and both the TYPE_A and TYPE_B polling flags are equal to zero, then the PCD may optionally suspend the Operating Field (as defined in section 3.2.10) before continuing with 9.2.1.3 (symbol 21 and symbol 22). […] 9.2.1.7 If the PCD supports other technologies, then the PCD shall reset suspend the Operating Field (as defined in section 3.2.10) before continuing with 9.2.1.3 (symbol 20). PCDs that implement other technologies are responsible for suppressing any unintentional collision indications. These would occur when PICCs support more than one technology and are due to the same PICC responding both before and after the RESET suspend of the Operating Field (symbol 20). Add tSUSPEND to Table A.6 of Annex A.5 as follows: Table A.6: PCD Processing Parameter tRESET tSUSPEND tP […] PCD Value Min Max 5.1 10 5.12 30 5.1 10 PICC Value Units 5 ms ms 5 ms 2 The minimum time for tSUSPEND guarantees the PICC is reset with a suspend of the Operating Field.

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Legal Notice

The EMV® Specifications are provided “AS IS” without warranties of any kind, and EMVCo neither assumes nor accepts any liability for any errors or omissions contained in these Specifications. EMVCO DISCLAIMS ALL REPRESENTATIONS AND WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT, AS TO THESE SPECIFICATIONS. EMVCo makes no representations or warranties with respect to intellectual property rights of any third parties in or in relation to the Specifications. EMVCo undertakes no responsibility to determine whether any implementation of the EMV® Specifications may violate, infringe, or otherwise exercise the patent, copyright, trademark, trade secret, know-how, or other intellectual property rights of third parties, and thus any person who implements any part of the EMV® Specifications should consult an intellectual property attorney before any such implementation. Without limiting the foregoing, the Specifications may provide for the use of public key encryption and other technology, which may be the subject matter of patents in several countries. Any party seeking to implement these Specifications is solely responsible for determining whether its activities require a license to any such technology, including for patents on public key encryption technology. EMVCo shall not be liable under any theory for any party’s infringement of any intellectual property rights in connection with the EMV® Specifications

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