1、ANSI INCITS 323-1998 (R2003)(formerly ANSI NCITS 323-1998)for Information Technology High-Performance Parallel Interface 6400 Mbit/s Physical Layer (HIPPI-6400-PH)ANSINCITS 323-1998American National Standardfor Information Technology High-Performance Parallel Interface 6400 Mbit/s Physical Layer (HI
2、PPI-6400-PH)SecretariatInformation Technology Industry CouncilApproved November 20, 1998 American National Standards Institute, Inc.AbstractThis document describes a physical-level, point-to-point, full-duplex, link interface for reliable, flow-con-trolled, transmission of user data at 6400 Mbit/s,
3、per direction, across distances of up to 1 km. A parallelcopper cable interface for distances of up to 40 m is specified. Connections to a separate longer-distanceoptical interface are provided. Small fixed-size micropackets provide an efficient, low-latency, structurefor small transfers, and a comp
4、onent for large transfers.Approval of an American National Standard requires review 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, s
5、ubstantial agreement has been reached by directly andmaterially affected interests. 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.T
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9、ion be taken periodically to reaffirm, revise, orwithdraw this standard. Purchasers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American National StandardPublished byAmerican National Standards Institut
10、e, Inc.11 West 42nd Street, New York, NY 10036Copyright 1999 by Information Technology 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, 1250 Eye Street NW, Washi
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15、red to avoid infringement in the use ofthis standard.iContentsPageForeword vIntroduction . viii1 Scope . 12 Normative references . 12.1 Approved references 12.2 References under development . 13 Definitions and conventions 23.1 Definitions. 23.2 Editorial conventions 23.3 Acronyms and other abbrevia
16、tions . 34 System Overview 34.1 Links . 34.2 Virtual Channels . 34.3 Micropacket 44.4 Message . 54.5 FRAME and CLOCK signals 54.6 Flow control 64.7 Retransmission. 64.8 Check functions 64.9 Local electrical interface (optional). 64.10 Copper cable physical layer (optional) . 65 Service interface. 85
17、.1 Service primitives . 85.2 Sequences of primitives . 85.3 Data transfer service primitives 85.4 Admin service primitives. 105.5 Control service primitives . 115.6 Status service primitives. 126 Micropacket contents 136.1 Bit and byte assignments . 136.2 Virtual Channel (VC) selector. 146.3 Micropa
18、cket TYPEs 146.4 Sequence number parameters . 156.5 Credit update parameters. 166.6 Check functions 177 Message structure 197.1 MAC header . 197.2 LLC/SNAP header 207.3 Payload. 208 Source specific operations . 208.1 Credit update indications on Source side. 208.2 ACK indications on Source side . 20
19、iiPage8.3 ACKs and credit updates to remote end 218.4 Micropacket retransmission 219 Destination specific operations. 229.1 Link level processing 229.2 Check for Message protocol errors 229.3 Generating ACKs . 2310 Signal line encoding . 2410.1 Signal line bit assignments. 2410.2 CLOCK and CLOCK_2 s
20、ignals 2410.3 FRAME signal 2610.4 Source-side encoding for dc balance . 2610.5 Destination-side decoding 2711 Skew compensation . 2711.1 Training sequences 2711.2 Training sequence errors . 2812 Link Reset and Initialization 2912.1 Link Reset 2912.2 Initialize 2912.3 Hold-off timer 3113 Link activit
21、y monitoring and shutdown 3113.1 Activity monitoring 3113.2 Link shutdown 3114 Maintenance and control features 3214.1 Timeouts. 3214.2 Logged events 3215 Local electrical interface (optional). 3315.1 Local electrical interface - output 3415.2 Local electrical interface - input 3415.3 Light present
22、signal 3416 Copper cable interface (optional) . 3616.1 Copper cable interface - output 3616.2 Copper cable interface - input 3716.3 CLOCK_2 . 3716.4 Copper cable connectors . 3916.5 Copper cable specifications . 41Tables1 CRC coverages in a 128-byte Message. 72 Micropacket contents summary 163 Signa
23、l line bit assignments in a 16-bit system 244 Signal line bit assignments in an 8-bit system 255 4b/5b line coding 26iiiPage6 Summary of timeouts 327 Summary of logged events . 328 Local electrical signal timing at Source driver output 359 Local electrical interface, Source driver output. 3510 Local
24、 electrical interface, Destination receiver input. 3611 Copper cable interface 3612 Copper cable interface signal timing at Source driver output . 3813 Copper cable interface, Source driver output . 3814 Copper cable interface, Destination receiver input . 3915 Copper cable assembly electrical speci
25、fications 4116 Cable layout 42A.1 Parallel LCRC input bits 46A.2 Parallel ECRC input bits . 47A.3 16-bit LCRC generator equations . 48A.4 64-bit LCRC generator equations . 49A.5 80-bit LCRC checker equations 50A.6 64-bit ECRC generator / checker equations . 51Figures1 System overview. 42 HIPPI-6400-
26、PH link showing signal lines 43 Logical micropacket format and naming conventions. 54 Message format 55 Reverse direction control information . 76 HIPPI-6400-PH service interface 87 Data transfer service primitives 98 Admin service primitives . 109 Control service primitives 1110 Status service prim
27、itives . 1211 Control bits summary 1412 LCRC implementation example 1813 ECRC implementation example 1814 Header micropacket contents . 1915 Detailed ULA layout 1916 16-bit system micropacket 2717 8-bit system micropacket 27ivPage18 16-bit system training sequence. 2819 8-bit system training sequenc
28、e. 2820 Initialize and Link Reset sequences . 3021 Local electrical interface block diagram . 3322 One signal (of 12 in each direction) of the local electrical interface . 3423 One signal (of 23 in each direction) of the copper cable interface . 3724 Receiver equivalent circuit . 3725 Receiver eye m
29、ask (differential). 3926 Connecting the overall shield . 4127 Receptacle pin assignments 4228 Receptacle . 4329 Cable connector . 44A.1 Encode / decode circuit example . 45A.2 Parallel LCRC generator example 46A.3 Parallel LCRC checker example 47A.4 Parallel ECRC example 48AnnexA Implementation comm
30、ents . 45A.1 4b/5b encoding and decoding 45A.2 Frequency differences between Source and Destination. 45A.3 LCRC parallel implementation 46A.4 ECRC parallel implementation . 47A.5 Undetected errors. 47A.6 ECRC and LCRC calculation example. 48vForeword (This foreword is not part of American National S
31、tandard NCITS 323-1998.)This American National Standard specifies a physical-level, point-to-point, full-du-plex, link interface for reliable, flow-controlled, transmission of user data at 6400 Mbit/s,per direction, across distances of up to 1 km. A parallel copper cable interface fordistances of up
32、 to 40 m is specified. Connections to a separate longer-distance opti-cal interface are provided. Small fixed-size micropackets provide an efficient, low-la-tency, structure for small transfers, and a component for large transfers.This standard provides an upward growth path for legacy HIPPI-based s
33、ystems.This document includes one annex which is informative and is not considered part ofthe standard.Requests for interpretation, suggestions for improvement or addenda, or defect re-ports are welcome. They should be sent to the National Committee for InformationTechnology Standards (NCITS), ITI,
34、1250 Eye Street, NW, Suite 200, Washington,DC 20005.This standard was processed and approved for submittal to ANSI by NCITS. Com-mittee approval of the standard does not necessarily imply that all committee mem-bers voted for approval. At the time it approved this standard, NCITS had thefollowing me
35、mbers:Karen Higginbottom, ChairmanDavid Michael, Vice-ChairmanMonica Vago, SecretaryOrganization Represented Name of RepresentativeAMP, Inc. John HillCharles Brill (Alt.)Apple Computer, Inc. David MichaelJerry Kellenbenz (Alt.)AT- A full-duplex link capable of independent full-bandwidth transfers in
36、 both direc-tions simultaneously;- Four virtual circuits providing a limited multiplexing capability;- A fixed-size transfer unit, i.e., a 32-byte micropacket, for hardware efficiency;- A small transfer unit resulting in low latency for short Messages, and a compo-nent for large transfers;- Credit-b
37、ased flow control that prevents buffer overflow;- End-to-end, as well as link-to-link, checksums;- Automatic retransmission to correct flawed data providing guaranteed, in-order,reliable, data delivery;- An ac coupled parallel electrical interface for driving parallel copper cable overlimited distan
38、ces;- A parallel electrical interface for driving a local optical interface for longer dis-tances.AMERICAN NATIONAL STANDARD ANSI NCITS 323-19981High-Performance Parallel Interface 6400 Mbit/s Physical Layer (HIPPI-6400-PH)1 ScopeThis American National Standard specifies aphysical-level, point-to-po
39、int, full-duplex, link in-terface for reliable, flow-controlled, transmissionof user data at 6400 Mbit/s, per direction, acrossdistances of up to 1 km. A parallel copper cableinterface for distances of up to 40 m is specified.Connections to a separate longer-distance opticalinterface are provided. S
40、mall fixed-size micro-packets provide an efficient, low-latency, structurefor small transfers, and a component for largetransfers.Specifications are included for: automatic retransmission to correct flaweddata; the format of a small data transfer unit calleda micropacket; a Message structure that in
41、cludes routing in-formation for network applications; end-to-end, as well as link-to-link, checksums; the timing requirements of the parallel signals; a parallel interface using copper coaxial cable; connections to a separate local optical inter-face; a link-level protocol tuned for a maximumdistanc
42、e of 1 km.2 Normative referencesThe following standards contain provisions which,through reference in the text, constitute provisionsof this standard. At the time of publication, theeditions indicated were valid. All standards aresubject to revision, and parties to agreementsbased on this standard a
43、re encouraged to investi-gate the possibility of applying the most recenteditions of the standards listed below.Copies of the following documents can be ob-tained from ANSI: Approved ANSI standards,approved and draft international and regionalstandards (ISO, IEC, CEN/CENELEC, ITU-T),and approved for
44、eign standards (including BSI,JIS, and DIN). For further information, contactANSI Customer Service Department at 212-642-4900 (phone), 212-302-1286 (fax) or via theWorld Wide Web at http:/www.ansi.org. Addi-tional availability contact information is providedbelow as needed.2.1 Approved referencesANS
45、I/IEEE Std 802-1990, IEEE Standards forLocal and Metropolitan Area Networks: Overviewand architecture (formerly known as IEEE Std802.1A, Project 802: Local and Metropolitan AreaNetwork Standard Overview and Architecture)ISO/IEC 8802-2:1989 (ANSI/IEEE Std 802.2-1989), Information Processing Systems L
46、ocalArea Networks Part 2: Logical link control2.2 References under developmentAt the time of publication, the following referencedstandards were still under development. For in-formation on the current status of the document,or regarding availability, contact the relevant stan-dards body or other or
47、ganization as indicated. Forinformation about obtaining copies of this docu-ment or for more information on the current statusAmerican National Standardfor Information Technology ANSI NCITS 323-19982of the document, contact National Committee forInformation Technology Standards, 1250 EyeStreet, NW,
48、Suite 200, Washington, DC 20005,202-626-5746.NCITS 324, High-Performance Parallel Interface,6400 Mbit/s Switch Control (HIPPI-6400-SC)NCITS 1249-D, High-Performance Parallel Inter-face, 6400 Mbit/s Optical Interface (HIPPI-6400-OPT)3 Definitions and conventions3.1 DefinitionsFor the purposes of this
49、 standard, the followingdefinitions apply.3.1.1 acknowledge (ACK): Confirmation thatthe Destination has received the micropacketwithout errors.3.1.2 administrator: A station management en-tity providing external management control.3.1.3 credit: A credit corresponds to one micro-packets worth of buffer space available in theDestinations VC buffer.3.1.4 Destination: The receiving end of a physi-cal link.3.1.5 Element: Any component of a HIPPI-6400system that is able to receive, process, and sendAdmin micropackets.3.1.6 Final Destination: The end device thatreceives, a
