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BSR NCITS 332 for Information Technology – Fibre Channel Arbitrated Loop (FC-AL-2) 2 3 3 S T I C N R S B

BSR NCITS 332 American National Standard for Information Technology – Fibre Channel Arbitrated Loop (FC-AL-2) Secretariat Information Technology Industry Council Approved (not yet approved) American National Standards Institute, Inc. Abstract This standard defines functional requirements for an interoperable Arbitrated Loop topology to support the Fibre Channel standard.

American National Standard Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgement of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or 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 in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. Institute. Requests for CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. CAUTION: The developers of this standard have requested that holders of patents that may be required for the implementation of the standard disclose such patents to the publisher. However, neither the developers nor the publisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard and following calls for the identification of patents that may be required for the implementation of the standard, no such claims have been made. No further patent search is conducted by the de- veloper or publisher in respect to any standard it processes. No representation is made or implied that licenses are not required to avoid infringement in the use of this standard. Published by American National Standards Institute, Inc. 11 West 42nd Street, New York, NY 10036 Copyright © 1999 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be reproduced in any form, 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 America

Contents Page Foreword ...............................................................................................................xi Introduction ......................................................................................................... xiii 1 2 3 4 5 6 7 8 9 Scope ........................................................................................................... 1 Normative references ................................................................................... 2 Definitions and conventions.......................................................................... 3 Structure and concepts................................................................................. 8 Addressing.................................................................................................. 13 FC-AL Ordered Sets................................................................................... 17 FC-AL Primitive Signals and Sequences.................................................... 18 L_Port operation ......................................................................................... 24 L_Port state transition tables ...................................................................... 49 10 Loop Initialization procedure....................................................................... 73 Tables 1 2 3 4 5 6 7 8 9 8B/10B characters with neutral disparity .................................................... 14 Primitive Signals ......................................................................................... 17 Primitive Sequences................................................................................... 17 MONITORING (State 0) transitions ............................................................ 50 ARBITRATING (State 1) transitions ........................................................... 54 ARBITRATION WON (State 2) transitions ................................................. 57 OPEN (State 3) transitions ......................................................................... 59 OPENED (State 4) transitions .................................................................... 61 XMITTED CLOSE (State 5) transitions ...................................................... 64 10 RECEIVED CLOSE (State 6) transitions.................................................... 67 11 12 TRANSFER (State 7) transitions ................................................................ 70 INITIALIZATION process (State 8) transitions ........................................... 72 13 Reserved .................................................................................................... 72 14 OLD-PORT (State A) transitions ................................................................ 72 15 AL_PA mapped to bit maps........................................................................ 78 Figures 0 1 2 3 4 Fibre Channel roadmap.............................................................................. xiii Examples of the Loop topology .................................................................. 10 FC-PH with Arbitrated Loop addition .......................................................... 11 State Diagram............................................................................................. 31 Loop Initialization Sequences..................................................................... 76 i

Page Loop Initialization Sequence AL_PA bit map ............................................. 80 Loop Initialization state diagram example .................................................. 83 POWER-ON state diagram ........................................................................ 85 OLD-PORT state diagram .......................................................................... 87 Loop Fail Initialization state diagram .......................................................... 89 5 6 7 8 9 10 Normal Initialization state diagram ............................................................. 91 11 OPEN-INIT state diagram .......................................................................... 93 12 Slave Initialization state diagram................................................................ 95 13 Slave AL_PA position map state diagram .................................................. 98 14 Master Initialization state diagram .............................................................. 99 15 Master AL_PA position map state diagram .............................................. 101 Annexes A B C D E F G H I J K L L_Port Elasticity buffer management ....................................................... 103 Loop Port State Machine examples ........................................................ 107 Dynamic Half-Duplex................................................................................ 110 Access unfairness .................................................................................... 112 Half-duplex operation ............................................................................... 113 BB_Credit and Available_BB_Credit management example.................... 114 L_Port clock design options ..................................................................... 116 Mark Synchronization examples .............................................................. 118 Port Bypass Circuit example and usage .................................................. 119 Public L_Ports and Private NL_Ports on a Loop ..................................... 122 Assigned Loop Identifier........................................................................... 123 Selective replicate for parallel query acceleration .................................... 124 M Controlled FC-AL configurations .............................................................. 127 N O P Q Insertion modes of Hubs .......................................................................... 129 L_Port power-on considerations.............................................................. 130 L_Port initialization flow diagram.............................................................. 131 Examples of Switch Port Initialization....................................................... 132 Index ................................................................................................................. 135 ii

Foreword (This foreword is not part of BSR NCITS 332.) This standard defines functional requirements for an inter-operable Arbitrated Loop topology for Fibre Channel. This standard was prepared by Task Group T11 (formerly X3T9.3) of the Accredited Standards Committee X3 during 1993. The standard process started in 1989. This document includes annexes that are informative and are not considered part of the standard. Requests for interpretation, suggestions for improvements or addenda, or defect re- ports are welcome. They should be sent to the NCITS Secretariat, Information Tech- nology Industry Council, 1250 Eye Street, NW, Suite 200, Washington, DC 20005- 3922. This standard was processed and approved for submittal to ANSI by the National Committee for Information Technology Standards (NCITS). Committee approval of the standard does not necessarily imply that all committee members voted for ap- proval. At the time it approved this standard, NCITS had the following members: iii

Technical Committee T11 on Lower Level Interfaces, which developed and reviewed this standard, had the following members: Kumar Malavalli, Chair Edward L. Grivna, Vice-Chair Neil Wanamaker, Secretary Roger Ronald Earl E. Rydell Colin L. Schaffer John Scheible Pak Seto Robert N. Snively Jeffrey Stai Gary R. Stephens Arlan Stone Rich Taborek Fred Van Roessel Matt Wakeley Gary Warden Jeffrey L. Williams John Williams Michael Wingard Danny Ybarra Leonard Young Jeff Young Carl Zeitler Dal Allan (Alt.) Rick Allison (Alt.) Greg Alvey (Alt.) Ravi Anantharaman (Alt.) Charles Binford (Alt.) Daniel Brown (Alt.) Craig Carlson (Alt.) Edward Chang (Alt.) Terry Cobb (Alt.) Bill Collette (Alt.) Jeff Connell (Alt.) Dave Cravens (Alt.) Jerry D’Alessandro (Alt.) Robert Dahlgren (Alt.) Mike Dorsett (Alt.) Steve Finch (Alt.) Dave Ford (Alt.) Ren Franse (Alt.) Matt Gaffney (Alt.) Dave Gampell (Alt.) Michael Gerwig (Alt.) Joe Golio (Alt.) Thom Hall (Alt.) Bill Ham (Alt.) Daniel Heim (Alt.) Scott Hilliker (Alt.) Lee Hu (Alt.) David E. Instone (Alt.) James R. Johns (Alt.) Skip Jones (Alt.) Larry Jones (Alt.) Gregory Kapraun (Alt.) Michael J. Karg (Alt.) Julie Ann Kembel (Alt.) Allen N. Kramer (Alt.) Bill Kuypers (Alt.) Michael Lamatsch (Alt.) Larry Lamers (Alt.) Alan Langerman (Alt.) Edwin S. Lee III (Alt.) Mark Lippitt (Alt.) Bill Mable (Alt.) Paul Manka (Alt.) Roland Marot (Alt.) Bob Mayer (Alt.) Jim McGillis (Alt.) Brian McKean (Alt.) Stephan Meyer (Alt.) Gene Milligan (Alt.) Mike Morandi (Alt.) Eli Moyle (Alt.) Jay H. Neer (Alt.) Chris Nieves (Alt.) Charles Nogales (Alt.) John J. Nutter (Alt.) Michael O’Donnell (Alt.) Robert Pearson (Alt.) George Penokie (Alt.) David Peterson (Alt.) Craig Prunty (Alt.) Michael Pugh (Alt.) Said Rahman (Alt.) Bart Raudebaugh (Alt.) Ron Reynolds (Alt.) Wayne Rickard (Alt.) Chris Simoneaux (Alt.) Brian R. Smith (Alt.) Bernard Warnakula Sooriya (Alt.) Steven E. Swanson (Alt.) Jacqueline Sylvia (Alt.) Tad Szostak (Alt.) Jonathan Thatcher (Alt.) Lloyd E. Thorsbakken (Alt.) Luis Torres (Alt.) Kevin White (Alt.) Lynn Whitfield (Alt.) Steven Wilson (Alt.) Paula Zoller (Alt.) David Baldwin Paul Boulay Joe Breher Scott Carlson James Coomes Robert Cornelius Roger Cummings Zane Daggett Scott Darnell Jan V. Dedek Don Deel David Deming Mark DeWilde Schelto Van Doorn Mike Dudek Peter Dunlap Mike Fitzpatrick David Ford Michael S. Foster Kenneth J. Fredericks Edward M. Frymoyer Edward A. Gardner Chuck Grant Michael E. Griffin Virginia F. Haydu David F. Hepner Michael Hoard Albert F. Kelley Robert W. Kembel Bret Ketchum Ronald J. Kleckowski Dale LaFollette Paul A. Levin Tom Lindsay William Lynn William R. Martin Gregory McSorley Vince Melendy Dennis P. Moore Francis Mottini Chris Mulvey James Myers Hari Naidu J. Michael Nauman James Nelson Tom Palkert Elwood Parsons Robert K. Pedersen Curtis A. Ridgeway Elizabeth G. Rodriguez iv

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