ANSI INCITS 295-1996 Information Technology - Serial Storage Architecture - Transport Layer 1 (SSA-TL1).pdf
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1、ANSI INCITS 295-1996 (R2001)(formerly ANSI X3.295-1996 (R2001)for Information Technology -Serial Storage Architecture -Transport Layer 1 (SSA-TL1)ANSI X3.295-1 996 American National Standard for Information Technology - Serial Storage Architecture - Transport Layer 1 (SSA-TLI) Secretariat Informatio
2、n Technology Industry Council Approved November 29, 1996 American National Standards Institute, Inc. Abstract This standard defines the transport layer of the Serial Storage Architecture (SSA). SSA defines a serial interface hierarchy to be used for purposes within its distance and perfor- mance cha
3、racteristics, including, but not limited to, storage subsystems. This standard is intended to be used with an upper layer protocol e.g., SCSI-2 Protocol (SSA-S2P), and a physical layer e.g., Physical Layer 1 (SSA-PHl). AmericanNationalStandardApproval of an American National Standard requires review
4、 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 judgment of the ANSI Board of StandardsReview, substantial agreement has been reached by directly and materiallyaffected interests.
5、Substantial agreement means much more than a simplemajority, but not necessarily unanimity. Consensus requires that all views andobjections be considered, and that a concerted effort be made toward theirresolution.The use of American National Standards is completely voluntary; their existencedoes no
6、t in any respect preclude anyone, whether he has approved the standardsor not, from manufacturing, marketing, purchasing, or using products, processes,or procedures not conforming to the standards.The American National Standards Institute does not develop standards and will inno circumstances give a
7、n interpretation of any American National Standard.Moreover, no person shall have the right or authority to issue an interpretation ofan American National Standard in the name of the American National StandardsInstitute. Requests for interpretations should be addressed to the secretariat orsponsor w
8、hose name appears on the title page 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, or withdrawthis standard. Purchasers
9、of American National Standards may receive currentinformation on all standards by calling or writing the American National StandardsInstitute.CAUTION: The developers of this standard have requested that holders of patents that may be required for theimplementation of the standard disclose such paten
10、ts to the publisher. However, neither the developers nor the publisherhave undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date ofpublication of this standard, following calls for the identification of patents that may be required for the
11、implementation ofthe standard, notice of one or more such claims has been received. By publication of this standard, no position is takenwith respect to the validity of this claim or of any rights in connection therewith. The known patent holder(s) has (have),however, filed a statement of willingnes
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13、representation ismade or implied that this is the only license that may be required to avoid infringement in the use of this standard.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1997 by Information Technology Industry Council (ITI)All right
14、s reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of ITI, 1250 Eye Street NW,Washington, DC 20005.Printed in the United States of AmericaContents Page Foreword . . . . . . . . . . . . . . . . . . . . .
15、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1 Scope 1 1.1 SSA-TLl characteristics . 1 1.2 SSA family of standards .2 2 Normative references . 3 3 Definitions, symbols, and abbreviations . .3 3.1 Definitions . 3 3.2 Symbols and abbreviations . 4 4 Conventions .5 5 Web . 6 5.1 Strings
17、 . 7 5.2 Loops 7 5.3 Complex web containing switches . . 8 6 88/i OB code 8 6.1 Data characters 9 6.2 Special characters . .lO 6.3 Initialization . 12 6.4 Code violations 13 6.5 Permitted special character sequences .l3 7 Frames . .13 7.1 CONTROL field . .15 7.2 STATUS field .16 7.3 PATH field .16 7
18、.4 ADDRESS field . .17 7.5 DATA field . 18 7.6 CRC field . 18 8 Protocol . 19 8.1 Router functions .19 8.2 Web routing .19 8.3 Node routing . .22 8.4 Flow control .22 8.5 SAT . 25 8.6 Priority for transmission 29 9 Link management . 30 9.1 Port attributes . .30 9.2 Node based data structures 36 9.3
19、Beginning communication process . .39 9.4 Configuration . 40 9.5 Resets .41 10 Error handling . .44 10.1 Link ERP 44 Page 10.2 Invalid SMS field handling . 50 10.3 Asynchronous alert process . .52 10.4 De-queue asynchronous alert process 52 10.5 ASYNC ALERT SMS handling process 53 10.6 MASTER ALERT
20、SMS handling process .55 11 SSA-TLl message structures .57 11 .l SMS validation .58 11.2 Privileged SMS 59 11.3 Application SMS .75 12 Transport layer processes . .78 12.1 Master negotiation process . 79 12.2 Master alive process . 80 Tables 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 2
21、3 24 25 ii Bit ordering in a byte . 5 5B/6B encoding rules . 9 3B/4B encoding rules . 10 Special characters 10 User Defined character definition 12 Frame contents 14 CONTROL field 15 FRAME TYPE field . 15 RESET TYPE field 15 Port table entry . 35 Queued asynchronous alert table entry . 35 Asynchrono
22、us alert address table entry .36 UNIQUE ID field . 37 Master asynchronous alert table entry .37 Configuration table entry . .38 Configutor table entry .39 Link status byte . .47 Receiver errors . .47 Recovery from corrupted ACK character pair .50 Response to non-zero reserved fields or reserved code
23、 values 5 2 Generic SSA-TLl message structure . .57 SSA-TLl messages supported . .57 ASYNC ALERT SMS . .59 Format of the ALERT CODE field . .59 ALERT CODE values 61 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Page ASYNC REPLY SMS _ . 62 RETURN CODE field values .62 CONFIGURE
24、 PORT SMS . 63 MODE field values . .64 MASTER ALERT SMS * . 65 QUERY NODE SMS . 66 SSA-TLl VERSION field values 66 QUERY NODE REPLY SMS .67 Upper-level protocol code values . .66 QUERY PORT SMS 69 QUERY PORT REPLY SMS 69 SUPPORTED SPEED field . 70 CURRENT SPEED field 70 QUERY PROTOCOL SMS . .71 QUER
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