ANSI INCITS 472-2011 Information Technology C Automation Drive Interface C Transport Protocol - 2 (ADT-2).pdf
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1、American National StandardDeveloped byfor Information Technology Automation/Drive Interface Transport Protocol - 2(ADT-2)INCITS 472-2011INCITS 472-2011INCITS 472-2011American National Standardfor Information Technology Automation/Drive Interface Transport Protocol - 2(ADT-2)SecretariatInformation Te
2、chnology Industry CouncilApproved June 14, 2011American National Standards Institute, Inc.AbstractThis standard specifies the transport requirements for the SCSI automation drive interface device. Thisstandard permits the SCSI automation drive interface devices to attach to application clients andpr
3、ovides the definitions for their use.This standard does not contain material related to any command structure for automation drive interfacedevices, that is used in conjunction with this standard. For reference to command structure, refer to ADC-3.Approval of an American National Standard requires r
4、eview by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgement of the ANSI Board ofStandards Review, substantial agreement has been reached by directly andmaterially affected inter
5、ests. Substantial agreement means much more thana simple majority, but not necessarily unanimity. Consensus requires that allviews and objections be considered, and that a concerted effort be madetowards their resolution.The use of American National Standards is completely voluntary; theirexistence
6、does not in any respect preclude anyone, whether he has approvedthe standards or not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures not conforming to the standards.The American National Standards Institute does not develop standards andwill in no circumstances
7、 give an interpretation of any American NationalStandard. Moreover, no person shall have the right or authority to issue aninterpretation of an American National Standard in the name of the AmericanNational Standards Institute. Requests for interpretations should beaddressed to the secretariat or sp
8、onsor whose name appears on the titlepage of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise, orwithdraw this standard. Purch
9、asers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Standards Institute, Inc.25 West 43rd Street, New York, NY 10036Copyright 2011 by Information Te
10、chnology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1101 K Street NW, Suite 610 Washington, DC 20005. Printed in the United States of AmericaCAUTION: The d
11、evelopers of this standard have requested that holders of patents that may be re-quired for the implementation of the standard disclose such patents to the publisher. However, nei-ther the developers nor the publisher have undertaken a patent search in order to identify which, ifany, patents may app
12、ly to this standard. As of the date of publication of this standard, followingcalls for the identification of patents that may be required for the implementation of the standard,notice of one or more such claims has been received. By publication of this standard, no positionis taken with respect to
13、the validity of this claim or of any rights in connection therewith. The knownpatent holder(s) has (have), however, filed a statement of willingness to grant a license underthese rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to ob-tain such a license. Details
14、 may be obtained from the publisher. No further patent search is con-ducted by the developer or publisher in respect to any standard it processes. No representation ismade or implied that this is the only license that may be required to avoid infringement in the use ofthis standard.iContentsPageFore
15、wordxIntroduction.xiii1 Scope.12 References.32.1 Normative references 32.1.1 Normative references overview.32.1.2 Approved references.32.1.3 References under development32.1.4 IETF References52.1.5 IEEE references.52.2 Informative references53 Definitions, symbols, abbreviations, and conventions.63.
16、1 Definitions.63.2 Symbols and abbreviations.93.3 Keywords93.4 Editorial conventions.103.5 Notation conventions.123.5.1 Notation for procedures and functions.123.5.2 Notation for state machines.133.5.2.1 Notation for state machines overview.133.5.2.2 Sub-state machines133.5.2.3 Transitions143.5.2.4
17、Messages, requests, and event notifications143.5.3 Notation for communication sequence diagrams.144 General164.1 Architecture.164.1.1 Architecture introduction164.1.2 ADT protocol layers.174.2 Default operating parameters.194.3 ADT state machines204.3.1 Introduction204.3.2 ADT Port state machine.204
18、.3.2.1 ADT port state machine overview.204.3.2.2 P0:Initial state.214.3.2.3 P1:Login state.224.3.2.4 P2:Logged-In234.3.2.5 P3:Logged-Out state.244.3.3 Link negotiation state machine244.3.3.1 Link negotiation state machine overview244.3.3.2 Precedence of Port Login exchanges.254.3.3.3 Common renegoti
19、ation conditions264.3.3.4 N0:Idle state264.3.3.5 N1:Negotiating state.274.3.3.6 N2:Accept Sent state284.3.3.7 N3:Accept ACK Sent state294.3.3.8 N4:Agreed state29ii4.3.4 Transmitter state machine.304.3.4.1 Transmitter state machine overview.304.3.4.2 T0:Entering state.314.3.4.3 T1:Active state314.3.4
20、.4 T2:Paused state314.3.5 Transmitter error recovery state machine324.3.5.1 Transmitter error recovery state machine overview324.3.5.2 TE0:Idle state324.3.5.3 TE1:Initiating Recovery state334.3.5.4 TE2:Retry Initiate Recovery state.334.3.6 Receiver error recovery state machine334.3.6.1 Receiver erro
21、r recovery state machine overview334.3.6.2 RE0:Idle state.344.3.6.3 RE1:Pending Recovery state344.3.6.4 RE2:Recovering state.354.4 ACK Offset354.5 Frame Number Counters364.5.1 Frame Number Counters overview364.5.2 Next Frame To Send counter.364.5.3 Expected Frame Number counter364.6 Link layer error
22、 recovery.374.6.1 Error detection.374.6.1.1 Error detection overview.374.6.1.2 Error detection by the frame sender.374.6.1.3 Error detection by the frame receiver374.6.2 Error recovery384.6.2.1 Corrupted frame384.6.2.2 Error recovery for symbol framing errors384.6.2.3 Recoverable error.384.6.2.4 Ret
23、ryable error394.6.2.5 Protocol error394.6.2.6 Resource limitation error.404.7 Hard reset.414.8 I_T nexus loss.414.9 Transport protocol variations from SAM-4414.10 Acknowledgement time-out period434.10.1 Acknowledgement time-out period calculation.434.10.2 . Acknowledgement time-out period negotiatio
24、n434.10.2.1 Acknowledgement time-out period negotiation introduction.434.10.2.2 Discovering another ADT ports acknowledgement time-out period parameters434.10.2.3 Altering another ADT ports acknowledgement time-out period444.10.2.4 Exception conditions.445 Physical layer.455.1 Physical layer introdu
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